A headphone includes a feedback microphone that receives a front air chamber sound including an external sound, the feedback microphone being provided on a front air chamber side, a driver unit that emits a noise-canceling sound into the front air chamber, the noise-canceling sound canceling at least a part of the sound included in the front air chamber sound received by the feedback microphone, a balanced microphone that receives the noise-canceling sound emitted from the driver unit, the balanced microphone being provided in a region on a side of the driver unit opposite the front air chamber, and a sound generating part that generates the noise-canceling sound by adding a signal based on the noise-canceling sound received by the balanced microphone to a signal based on the front air chamber sound received by the feedback microphone.
H04R 5/027 - Spatial or constructional arrangements of microphones, e.g. in dummy heads
G10K 11/178 - Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
A headphone includes a driver unit 2, the first housing 4 that forms a first air chamber 11 on a back side of the driver unit 2, the second housing 5 that forms a second air chamber 12 on an opposite side of an inner surface different from an inner surface where the driver unit 2 is provided in the first housing 4, and a damper 61 provided in the second housing 5. In the first housing 4, an opening 44 that communicates between the first air chamber 11 and the second air chamber 12 is formed.
H04R 1/28 - Transducer mountings or enclosures designed for specific frequency response; Transducer enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
An electroacoustic transducer includes a driver, a diaphragm 13 driven to vibrate by the driver and emitting sound, a baffle 22 holding the driver and the diaphragm 13, first openings 25 extending through the baffle 22, an acoustic resistor 23 disposed on the back side of the baffle 22, and second openings 26 extending from the front side to the back side of the acoustic resistor 23. The baffle 22 is provided on the back side of the diaphragm 13. The first openings 25 are provided in the baffle 22. The second openings 26 are each disposed above one of the first openings 25 in the acoustic resistor 23. The electroacoustic transducer exhibits an excellent frequency response even if a sufficient volume of a space is not provided on the back side of the diaphragm 13.
H04R 1/28 - Transducer mountings or enclosures designed for specific frequency response; Transducer enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
A condenser microphone is provided that can ensure the fixation of an electroacoustic transducer inside a unit case and the grounding of the electroacoustic transducer, regardless of variations in manufacture of the unit case and a circuit board. A condenser microphone unit includes an electroacoustic transducer and a unit case accommodating the electroacoustic transducer. The unit case includes at least one protrusion that is disposed on the inner circumferential surface of the unit case. The electroacoustic transducer is fixed inside the unit case with the protrusion.
A microphone includes a tubular microphone case having conductivity, a circuit board on which a circuit is configured, the circuit being used for an operation of a microphone unit that converts an audio signal into an electrical signal, a light source that is accommodated in a position close to a first end of the microphone case and emits light, a light source mounting board on which the light source is placed, a holding member that has conductivity, holds the light source mounting board and the circuit board, and is fixed to the microphone case, and a light guide member including a protrusion. The holding member includes a light source mounting board accommodating portion that accommodates the light source mounting board, a circuit board accommodating portion that accommodates the circuit board, and a hole that can accept the protrusion.
To enable light to be easily visually recognized, the light indicating an operation state. A tubular microphone case, a light source that is accommodated in a position close to a first end of the microphone case and emits light in a direction of the first end, a light source mounting board on which the light source is placed, a light guide member including a protrusion and having an optically transmissive property, and a holding member that maintains a position of the light source and a position of the light guide member, and is fixed to the microphone case together with the light source mounting board are included, and the holding member includes a hole capable of accepting the protrusion.
A wireless receiver includes an RF muting circuit that opens and closes a signal line of a demodulated signal according to a received carrier strength level, a noise muting circuit that opens and closes the signal line according to a noise level in the modulated signal, and an RF attenuation circuit that attenuates a RF signal handled in a RF amplifier circuit, and additionally includes a reception mode switching circuit which can simultaneously select at least any two values from those comprising one of a plurality of predetermined threshold values of the RF muting circuit, one of a plurality of predetermined threshold values of the noise muting circuit and one of a plurality of predetermined amount of attenuation of the RF attenuation circuits. This configuration allows to provide a wireless receiver having a stable reception characteristics without sound interruption or interferences in a multi-wave operation of wireless microphones.
A wireless receiver includes an RSSI generation circuit that obtains RSSI output corresponding to a carrier strength level of a received RF signal; a lookup table from which a threshold value corresponding to temperature information from a temperature sensor is read based on the temperature information; a comparison circuit that generates comparison output when the RSSI output is below the threshold value read from the lookup table, in which the threshold value is one input, and the RSSI output from the RSSI generation circuit is the other input; and a muting circuit that closes a signal line of an audio signal demodulated from the RF signal, and cuts off output of the audio signal, based on the comparison output from the comparison circuit. The above configuration enables the wireless receiver to eliminate fluctuation of a reception reaching distance relative to temperature change, and ensure stable mute operation.
A wireless receiver, which receives a radio wave (RF) signal from a wireless microphone, demodulates an audio signal, and displays an RF reception state proportional to strength of a received signal on an indicator, includes a first frequency conversion (FC) unit generating a first IF signal based on the received RF signal; a second FC unit generating a second IF signal based on the first IF signal; a first received RF strength measuring unit detecting a first level signal from the first IF signal generated by the first FC unit; a second received RF strength measuring unit detecting a second level signal from the second IF signal generated by the second FC unit; and a synthesizing unit synthesizing the first level signal detected by the first received RF strength measuring unit and the second level signal detected by the second received RF strength measuring unit, and outputs a synthesized level signal.
In a wireless receiver having a plurality of antennas for wireless microphones, variation in received signal strength from the plurality of antennas is eliminated when displayed on an indicator.
The receiver includes a plurality of receiving circuits respectively corresponding to the plurality of antennas outputs a received signal strength as a detection voltage received by each of the antennas, an indicator that displays the received signal strength by the number of lighting segments, a lookup table in which a correspondence relation between a value of the detection voltage and the number of lighting segments of the indicator is set for each of the receiving circuits, and a display unit that refers to the lookup table based on the value of the detection voltage output from the plurality of receiving circuits and displays a level signal based on the number of lighting segments of the indicator set in the lookup table.
Provided is an impedance conversion circuit of a condenser microphone which includes a first electron tube operated in grounded-cathode mode to whose grid an output signal from a condenser microphone unit is inputted, and from whose plate a signal is outputted, a first emitter-follower circuit configured to receive a signal based on a plate output of the first electron tube and amplify a current, and a first feedback element configured to transmit a feedback signal from an emitter of a transistor configuring the first emitter-follower circuit to the grid of the first electron tube. And the impedance conversion circuit can achieve a wide dynamic range while using a voltage amplifier circuit with an electron tube at an initial stage.
In a unidirectional microphone unit, stable frequency characteristics can be obtained, and manufacturing cost is reduced while preventing increasing of an external size. A microphone cap that covers a microphone element is included, and the microphone cap includes a porous ring member arranged in the front of the microphone element to form a first communication space communicating with a front acoustic hole in a center side, and a cylindrical member supporting a peripheral edge portion of the ring member and surrounding a periphery side of the microphone element, and forming a second communication space communicating with a rear acoustic hole in the periphery side of the microphone element, and the first communication space and the second communication space are communicated through the ring member.
An audio output circuit of a condenser microphone includes a condenser microphone unit, first and second impedance conversion circuits that receive a positive phase output signal and a reverse phase output signal from the condenser microphone unit, first and second output circuits that output an audio signal from the condenser microphone unit in a balanced line to a balanced output terminals upon receipt of outputs of the first and second impedance conversion circuits. First and second impedance conversion circuits respectively use FETs as source follower circuits and supply first and second impedance conversion outputs generated across source resistors to the first and second output circuits. A voltage regulating device that generates a constant voltage is connected in series to the source resistors. With this configuration, an audio output circuit of a condenser microphone is provided, which solves a problem of operation instability caused by variation of Idss's of the FETs.
A holder attachment for a drum secures a component to a drum, adds no excess load on the rim of the drum, and reduces effects on the tension applied to the drum head. The holder attachment for the drum includes a holding part configured to hold a component to be attached to the drum, and an attaching unit to be attached to the tension bolt of the drum. The holding part is connected to the attaching unit.
F16B 2/06 - Clamps, i.e. with gripping action effected by positive means other than the inherent resistance to deformation of the material of the fastening external, i.e. with contracting action
F16M 13/02 - Other supports for positioning apparatus or articles; Means for steadying hand-held apparatus or articles for supporting on, or attaching to, an object, e.g. tree, gate, window-frame, cycle
A microphone includes: first and second bi-directional microphone units having respective directional axes arranged on two straight lines passing through one point and radially extending with an interval of 120 degrees; a third bi-directional microphone unit having a directional axis arranged on a straight line perpendicular to a plane formed by the two straight lines; and an omnidirectional microphone unit arranged in sound collection regions of the first, second, and third bi-directional microphone units.
H04R 1/40 - Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers
H04R 1/38 - Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means in which sound waves act upon both sides of a diaphragm and incorporating acoustic phase-shifting means, e.g. pressure-gradient microphone
H04R 1/22 - Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
H04R 5/027 - Spatial or constructional arrangements of microphones, e.g. in dummy heads
A microphone apparatus includes a microphone including first and second bi-directional microphone units having respective directional axes arranged on two straight lines passing through one point and radially extending with an interval of 120 degrees in a circumferential direction, and an omnidirectional microphone unit arranged in sound collection regions of the first and second bi-directional microphone units, and a signal synthesis unit that synthesizes at least one of respective non-inverted signals and inverted signals of the first and second bi-directional microphone units and an output signal of the omnidirectional microphone unit to generate a plurality of output signals having directional axes in mutually different directions.
H04R 1/40 - Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers
H04R 3/04 - Circuits for transducers for correcting frequency response
H04R 1/22 - Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
H04R 1/32 - Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
H04R 5/027 - Spatial or constructional arrangements of microphones, e.g. in dummy heads
A noise-cancelling headphone is provided that prevents degradation in the sound quality of the sound output from the driver unit caused by the sounds leaking through the vent hole for adjusting the sound quality. The noise-cancelling headphone includes a housing unit having an interior and an exterior, a driver unit attached to the housing unit, and a microphone collecting sound at the exterior of the housing unit. The housing unit includes an accommodating portion accommodating the microphone and a vent hole establishing communication between an air chamber behind the driver unit and the exterior of the housing unit. The housing unit is constructed such that emitted sounds from the vent hole are prevented from being collected by the microphone.
A unidirectional condenser microphone having a front opening portion and a rear opening portion for respectively passing sound waves to a front surface and a back surface of a diaphragm of a microphone unit, the unidirectional condenser microphone includes: an acoustic tube provided in the front opening portion; a first air chamber provided between the rear opening portion and the back surface of the diaphragm of the microphone unit, and having a predetermined acoustic capacity; and a second air chamber communicating into the first air chamber, and having an acoustic capacity larger than the predetermined acoustic capacity, wherein sensitivity to a direction of 0° with respect to a directional axis is improved by the first air chamber and the acoustic tube, and a proximity effect due to the sound wave from a direction of 180° with respect to the directional axis is prevented by the second air chamber.
H04R 1/34 - Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means
An ear pad to be mounted to a base body to which a speaker unit is fixed includes an elastic body in which a plurality of elastic members having different coefficients of restitution are laminated together in a sound emitting direction of the speaker unit. A skin material covers an exterior of the elastic body. The elastic body includes a first elastic member arranged at a side of the base body, and a second elastic member laminated on and fixed to the first elastic member. The first and second elastic members respectively have ring shapes having a substantially same external diameter. The second elastic member has an inner peripheral surface having a different dimension compared to an inner peripheral surface of the first elastic member, and has a portion having a larger inner diameter than an inner diameter of the first elastic member.
A diaphragm is provided that has small mechanical anisotropy even when heat is applied to the diaphragm in the production process. The diaphragm includes a biaxially stretched film stretched in a first direction (the machine direction) and a second direction (the transverse direction), wherein the entire surface of the biaxially stretched film has a first pattern and a second pattern, the first pattern has ridges and grooves with a first pitch, the second pattern has ridges and grooves with a second pitch, the second pitch is smaller than the first pitch, the second pattern is formed along the first direction or the second direction, and the length of regions defined by the first pattern in the first direction differs from the length of the regions in the second direction.
A moving-magnet type pickup cartridge is disclosed, which includes a cantilever, a stylus chip attached to a front end part in a longitudinal direction of the cantilever, a damper disposed at a base end part in the longitudinal direction of the cantilever and configured to support the cantilever in a swingable manner, a magnet disposed in the longitudinal direction of the cantilever and immediately above the stylus chip at the front end part of the cantilever, and configured to vibrate with vibration of the stylus chip, and a yoke formed in a U-shape, having generating coils being wound thereon, and having magnetic poles at both leg parts thereof being disposed to face the magnet. With this configuration, there is provided a moving-magnet type pickup cartridge enables not only to ensure a large output signal but also to obtain a faithfully reproduced sound with little distortion.
G11B 3/00 - Recording by mechanical cutting, deforming or pressing, e.g. of grooves or pits; Reproducing by mechanical sensing; Record carriers therefor
G11B 3/10 - Arranging, supporting, or driving of heads or of transducers relatively to record carriers
H04R 11/12 - Gramophone pick-ups using a stylus; Recorders using a stylus signals being recorded or played-back by vibration of a stylus in two orthogonal directions simultaneously
A connector for a microphone and a microphone are provided that can prevent loose connections to a microphone stand. The connector for the microphone is to be inserted into a connector support hole of a microphone stand. The connector includes pins to be electrically connected to the microphone stand, a connector body accommodating the pins, a sleeve disposed on the outer circumferential surface of the connector body, and an elastic member for biasing the sleeve toward the rear end of the connector body. The sleeve has an insertion portion to be inserted into a space between the connector body and the connector support hole.
H01R 13/633 - Additional means for facilitating engagement or disengagement of coupling parts, e.g. aligning or guiding means, levers, gas pressure for disengagement only
H04R 1/04 - Structural association of microphone with electric circuitry therefor
A microphone is provided that ensures the electrical connection between a unit case and an audio-signal output circuit board. The microphone includes a unit case 10 having a shape of a hollow cylinder with a closed end and accommodating an electroacoustic transducer 20, an audio-signal output circuit board 40 connected to the electroacoustic transducer, and a microphone case accommodating the unit case and the audio-signal output circuit board, wherein the audio-signal output circuit board has a receiver 41 disposed on a portion of the peripheral edge of the audio-signal output circuit board, and an open end 11 of the unit case comes into contact with the receiver and is positioned when the unit case and the audio-signal output circuit board are accommodated in the microphone case.
A microphone amplifier unit, to which a microphone of a first form including an LED or a microphone of a second form without including an LED is connected, includes a microphone detecting unit that detects a connection state of the microphone of the first form or the second form based on potential information supplied to a specific terminal pin of a connector. In the microphone amplifier unit, appropriate circuit setting corresponding to functions of the respective microphones is made based on information obtained by the microphone detecting unit. With the configuration, a microphone connecting device that can commonly use the microphone of the first form and the microphone of the second form with a small number of pins is provided.
A microphone device includes an audio signal output circuit that balanced-outputs, through a balanced transmission line, an audio signal output from a condenser microphone unit, a balanced output terminal including a hot terminal, a cold terminal, and a ground terminal connected to the balanced transmission line, a power supply circuit that supplies a phantom power supply to the audio output circuit from the balanced output terminal through the balanced transmission line, and a display circuit including light emitting elements that perform lighting and non-lighting according to an operation of a manual switch, and the display circuit includes constant current elements that generate a constant current through the balanced transmission line, a constant voltage element connected to the constant current elements and which generates a constant voltage, and light emitting elements connected to the constant current elements, and to which the constant voltage by the constant voltage element is applied.
09 - Scientific and electric apparatus and instruments
41 - Education, entertainment, sporting and cultural services
Goods & Services
Record players; needles for record players; phono cartridges
for record players; record turntables; audio mixers;
headphones; microphones; loudspeakers; cleaning apparatus
for phonograph records; downloadable music files;
downloadable image files; electronic publications. Educational and instruction services relating to arts,
crafts, sports or general knowledge; providing information
on donation of human corpses for medical education;
arranging of donation of human corpses for medical
education; arranging, conducting and organization of
seminars; providing electronic publications; art exhibition
services; publication of books; arranging and planning of
movies, shows, plays or musical performances; movie theatre
presentations or movie film production and distribution;
presentation of live show performances; direction or
presentation of plays; presentation of musical performances;
production of radio or television programs; production of
videotape film in the field of education, culture,
entertainment or sports [not for movies or television
programs and not for advertising or publicity]; directing of
radio and television programs; operation of video and audio
equipment for production of radio and television programs.
Provided are a vibration unit which includes a pair of right and left coils that vibrate in response to vibration of a stylus attached to a cantilever and a magnetic circuit which includes a magnet and a pair of yokes and forms a magnetic path. The coils to be disposed in a gap between the pair of yokes are flat coils having perfect circular shapes, and V-shaped notches are formed on opposing surfaces, with the coils interposed therebetween, of the pair of yokes 4. An intersection angle of the V-shaped notch is set to be an angle to allow channel separation between right and left output signals to be obtained by the pair of coils to be equal to or larger than 20 db.
H04R 9/12 - Gramophone pick-ups using a stylus; Recorders using a stylus
H04R 11/08 - Gramophone pick-ups using a stylus; Recorders using a stylus
H04R 9/16 - Gramophone pick-ups using a stylus; Recorders using a stylus signals being recorded or played-back by vibration of a stylus in two orthogonal directions simultaneously
H04R 11/12 - Gramophone pick-ups using a stylus; Recorders using a stylus signals being recorded or played-back by vibration of a stylus in two orthogonal directions simultaneously
H04R 19/10 - Gramophone pick-ups using a stylus; Recorders using a stylus signals being recorded or played-back by vibration of a stylus in two orthogonal directions simultaneously
H04R 17/08 - Gramophone pick-ups using a stylus; Recorders using a stylus signals being recorded or played-back by vibration of a stylus in two orthogonal directions simultaneously
H04R 9/02 - Transducers of moving-coil, moving-strip, or moving-wire type - Details
A main body case is provided with an opening and closing lid supported in an openable and closable manner by a spindle at one end portion thereof as well as slidably attached in a direction orthogonal to a length direction of the spindle; a pair of unlocking knobs slidably arranged along a front surface of the opening and closing lid; and a locking portion formed on a main body case side that puts the opening and closing lid in a locked state by locking a step portion on a free end portion side of the opening and closing lid by sliding operating the opening and closing lid in one direction in a state where the opening and closing lid is closed.
An electroacoustic transducer includes a driver, a diaphragm 13 driven to vibrate by the driver and emitting sound, a baffle 21 holding the diaphragm 13, first apertures 25 extending from the front surface to the rear surface of the baffle 21, and a first acoustic resistor 22 disposed on the front surface of the baffle so as to cover the first apertures. The electroacoustic transducer includes a plurality of sound paths for guiding the sound generated by the diaphragm 13 to the rear surface of the baffle 21.
H04R 5/033 - Headphones for stereophonic communication
H04R 1/34 - Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means
Provided is a headphone unit including a housing having a convex portion and accommodating a driver unit, a support in contact with part of the outer surface of the convex portion, and a frictional member in contact with the support and the outer surface of the convex portion. The frictional member generates greater friction against the convex portion than the friction between the support and the convex portion. The housing is swingably joined to the support.
Provided is, in a microphone configured such that a microphone head including a microphone unit is attachably/detachably mounted to a microphone main body, a microphone which enables easy attachment/detachment of the microphone head, and which can perform a mute operation not only after removal of the microphone head but also in attachment/detachment of the microphone head. The microphone includes a mute circuit provided to a side of the microphone main body, and driven by an input of a mute command signal, a first mute control circuit provided to aside of the microphone head, and including a switch that switches disconnection/conduction of a wire, and a second mute control circuit provided to the side of the microphone main body, and electrically connected with the first mute control circuit and generates the mute command signal, in a state where the microphone head is coupled, and in attachment/detachment of the microphone head.
In a wireless microphone having an antenna in a lower part of a main body, a wireless microphone in which a microphone main body serves as a ground plane, which secures stable antenna ground by being gripped by a user, and which is capable of obtaining good RF performance is provided. The microphone main body includes a holder member made of metal for holding at least an antenna circuit part, a cylindrical cover member made of metal for covering a periphery of the holder member, and a cylindrical grip end member made of metal, inserted into a rear end side of the cover member, and connected with a rear part side of the holder member. The holder member has conduction with the cover member via the grip end member.
An electroacoustic transducer includes a driver, a diaphragm 13 driven to vibrate by the driver and emitting sound, a baffle 22 holding the driver and the diaphragm 13, first openings 25 extending through the baffle 22, an acoustic resistor 23 disposed on the back side of the baffle 22, and second openings 26 extending from the front side to the back side of the acoustic resistor 23. The baffle 22 is provided on the back side of the diaphragm 13. The first openings 25 are provided in the baffle 22. The second openings 26 are each disposed above one of the first openings 25 in the acoustic resistor 23. The electroacoustic transducer exhibits an excellent frequency response even if a sufficient volume of a space is not provided on the back side of the diaphragm 13.
H04R 1/28 - Transducer mountings or enclosures designed for specific frequency response; Transducer enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
A wiring structure is provided for an electroacoustic transducer directly converting digital signals from a single sound source to sound waves without conversion to analog signals. The structure includes a diaphragm, and a plurality of voice coils fixed to the diaphragm. The voice coils are connected to respective cables each consisting of a stranded pair of positive and negative input lines.
H04R 5/033 - Headphones for stereophonic communication
H04R 1/00 - LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS - Details of transducers
[Problem] To provide a tilt adjustment device capable of easily adjusting the tilt of an article and capable of being maintained in an affixed state even if the environment surrounding an installation location changes. [Solution] A tilt adjustment device has: a placement member for placing an article thereon; and a base for holding the placement member. The placement member has a holding section in contact with the base. The placement member is held on the base through the holding section by a first fastening member, a second fastening member, and a third fastening member. The position of the first fastening member relative to the placement member and the positions of the second fastening member and the third fastening member relative to the placement member are located opposite to each other relative to the holding section.
G11B 7/08 - Disposition or mounting of heads or light sources relatively to record carriers
G02B 7/00 - Mountings, adjusting means, or light-tight connections, for optical elements
G11B 7/09 - Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track f
G11B 7/12 - Heads, e.g. forming of the optical beam spot or modulation of the optical beam
G11B 7/22 - Apparatus or processes for the manufacture of optical heads, e.g. assembly
45.
Microphone holder and step formation member used with the same, and microphone shock mount using the microphone holder
A microphone holder holds a microphone in which an upper surface and a lower surface of a step portion are formed on an outer surface of a housing, and the microphone holder includes: a holder which is formed in a cylindrical shape having openings on upper and lower sides and in which a plurality of through passages penetrating a wall of the cylindrical shaped body is provided; a sliding portion provided movably in a circumferential direction along the openings of the holder; a lock ring configured to cover the through passage formed to the holder, from an outer side by a lock plate extending from the sliding portion; and a contact member which is movably held in the through passage and can contact on an upper surface side of the step portion of the microphone.
The microphone device includes a tubular support of a conductive material. A microphone unit is provided at one end of the support and grounded to the support. A cable passes through the support and includes core wires connected to a signal output terminal of the microphone unit. A conductive covering material that covers the core wires and is electrically connected to the support.
[Problem] To provide a headphone which has a headband length adjusting mechanism having wear-resistance and is also provided with a release prevention structure, while minimizing the number of parts. [Solution] This headphone is provided with: a pair of left and right earpieces, in each of which a headphone unit is incorporated in a housing; a headband having a shape curved in the longitudinal direction thereof; sliders which respectively connect the ends of both sides in the longitudinal direction of the headband with the earpieces and which are held in the ends so as to be movable forward and backward in the longitudinal direction of the headband; and cover members which cover wiring members for electrically connecting the respective earpieces on the surfaces of the sliders, wherein the sliders have long holes in the longitudinal direction of the headband, and the cover members cover the wiring members along the long holes.
A microphone holder includes: a holding member holding a microphone; and a mounting member fixed to a tension bolt for fixing a rim of a drum. The mounting member includes a first clamping portion having a first locking portion locking to a lower surface of the rim, a second clamping portion having a second locking portion locking the tension bolt, and a biasing member biasing in a direction allowing the first clamping portion and the second clamping portion to approach, wherein the mounting member is attached to the tension bolt by clamping the rim and the tension bolt between the first clamping portion and the second clamping portion, in a state that the first locking portion of the first clamping portion is locked to the lower surface of the rim and the second locking portion of the second clamping portion is locked to the head of the tension bolt.
G10H 1/00 - ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE - Details of electrophonic musical instruments
Provided is a condenser microphone having a plurality of condenser microphone units connected in series to improve output sensitivity, and a simplified circuit configuration. At least one of the preceding condenser microphone units, excepting a last condenser microphone unit, and an adjacent succeeding condenser microphone unit are directly connected to transmit an audio signal obtained from the at least one of the preceding condenser microphone units to the adjacent succeeding condenser microphone unit. An impedance converter using an active element is connected to the last condenser microphone unit, and the audio signals obtained from the condenser microphone units are added and output from the impedance converter using the active element.
H03F 3/185 - Low-frequency amplifiers, e.g. audio preamplifiers with semiconductor devices only with field-effect devices
H03F 3/50 - Amplifiers in which input is applied to, or output is derived from, an impedance common to input and output circuits of the amplifying element, e.g. cathode follower
A connector according to the invention includes: a metal cylinder; a conductive receptacle having an end fitted in an end of the metal cylinder; a pin assembly fitted in the conductive receptacle; pins fixed to the pin assembly, the pins being connected to a cable; a circuit board fixed to the other end of the metal cylinder, the circuit board having through holes electrically connected to the pins; and a sealant disposed between the circuit board and the pin assembly, the sealant infilling gaps between the pins and the through holes of the circuit board.
H04R 1/00 - LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS - Details of transducers
51.
Digital microphone and position-to-frequency converter
National University Corporation University of Toyama (Japan)
Inventor
Maezawa, Koichi
Tanoue, Koichiro
Abstract
A digital microphone includes: a cavity resonator operatable in a micrometer, millimeter, or electromagnetic waveband, the cavity resonator having a metal wall including a conductive membrane 32 that vibrates in response to incident acoustic waves and converts the shift of the membrane 32 into a resonance frequency of the cavity resonator; an FM-signal generator that modulates the resonance frequency of the cavity resonator in response to the shift of the membrane 32 and outputs FM signals from the metal wall other than the membrane; and a ΔΣ-modulated-signal generator that generates ΔΣ-modulated signals from the FM signals. The FM-signal generator includes a slot 36, a micro-strip line 38, and a negative resistive element 40. The ΔΣ-modulated-signal generator includes an edge detector 42.
A unidirectional condenser microphone includes a diaphragm, a fixed electrode disposed opposite a back face of the diaphragm and an electrode extraction part for the fixed electrode disposed at a backside of the fixed electrode and having a through hole adapted to capture a sound wave from a rear acoustic terminal into a backside of the diaphragm. The through hole has a horn-shaped opening formed in continuation of the through hole at the rear acoustic terminal side thereof such that an inner diameter of the horn-shaped opening is increased toward the rear acoustic terminal side. The electrode extraction part has a plurality of the through holes formed therein at regular intervals along a concentric circle around an axial center of the electrode extraction part, and all the through holes along the concentric circle have the horn-shaped openings formed therein, respectively.
H04R 1/34 - Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means
A microphone comprises a microphone unit; and a HOT terminal and a COLD terminal that produce a balanced output of output signals of the microphone unit, and no filter circuit is disposed between the microphone unit and the HOT terminal and a low-pass filter is disposed only between the microphone unit and the COLD terminal.
A condenser microphone that provides a balanced output of audio signals from initial steps of a diaphragm and a fixed electrode is provided. The condenser microphone includes: a condenser microphone unit including a diaphragm being arranged opposite a fixed electrode; a first impedance converter being connected to the fixed electrode of the condenser microphone unit and outputting a first electric signal generated in the fixed electrode; and a second impedance converter being connected to the diaphragm of the condenser microphone unit and outputting a second electric signal generated in the diaphragm. By this structure, balanced outputs of the audio signals having phases reverse to each other are provided by the first and second impedance converters immediately after the condenser microphone unit.
A condenser microphone includes a condenser microphone unit having a diaphragm and a fixed electrode disposed opposite to the diaphragm; a field effect transistor serving as an impedance converter; and a transistor to generate operational power for the field effect transistor; wherein the field effect transistor comprises a gate, a source and a drain, the gate is connected to the fixed electrode or the diaphragm, the diaphragm disposed opposite to the fixed electrode connected to the gate or the fixed electrode facing the diaphragm connected to the gate is grounded; the source is connected to a base of the transistor; the drain is connected to an emitter of the transistor; and a resistor establishing a base potential of the transistor is disposed between the base of the transistor and a ground.
A condenser stereomicrophone includes a mid condenser microphone unit that is connected to left and right side condenser microphone units such that the output from the mid condenser microphone unit is applied to the left and right side condenser microphone units. The left and right side condenser microphone units are connected to left and right-channel connector terminals, respectively; and the left and right-channel connector terminals are connected to the mid condenser microphone unit via corresponding power-supply resistors.
A narrow directional stereo microphone includes a narrow directional mid unit disposed such that the directional axis thereof aligns to the major axis of a microphone body, and a unidirectional right unit and a unidirectional left unit disposed symmetrically with respect to the major axis such that directional axes of the right and left units are perpendicular to the major axis, wherein signals output from the mid unit are sent to one of a diaphragm and a fixed electrode of the right unit and to one of a diaphragm and a fixed electrode of the left unit, and right channel signals are output from the other of the diaphragm and the fixed electrode of the right unit, and left channel signals are output from the other of the diaphragm and the fixed electrode of the left unit.
To provide an insulator, which supports a fixed pole in a unidirectional condenser microphone in a shareable manner among microphones that are different in the distance between acoustic terminals from one another. Coarse adjustment is performed on an insulator 31 including a plurality of sound holes 32 drilled therein by acoustically closing a predetermined sound hole 32 among the plurality of sound holes 32 by a predetermined sound hole closing means, and fine adjustment is performed by applying a predetermined amount of compressive force to an acoustic resistance member 40 by an acoustic resistance adjusting means 50 (adjustment nut 51), so as to adjust acoustic resistance present in a sound wave passage from a rear acoustic terminal to the back of a diaphragm.
H04R 1/32 - Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
H04R 1/34 - Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means
An analog signal transfer system includes a transmission apparatus including a variable compressor that variably compresses input signals exponentially according to the amplitudes of the input signals; and a reception apparatus including a variable expander that variably expands the compressed signals exponentially according to the amplitudes of the compressed signals.
The purpose of the present invention is to provide a liquid crystal shutter module capable of high-speed switching operation without the use of a ferroelectric liquid crystal and a method for controlling said module. A liquid crystal shutter (10) according to the present invention includes a control unit (3) for controlling a drive voltage on the basis of a control signal, a first liquid crystal module (1) that is switched to a shielding state when a drive voltage (101) is applied thereto, and a second liquid crystal module (2) that is switched to a transmissive state when a drive voltage (102) is applied thereto. The first liquid crystal module (1) and the second liquid crystal module (2) are laminated in the transmission direction of the light (9) from a light source. The control unit (3) preferentially controls the drive voltage for either the first liquid crystal module (1) or the second liquid crystal module (2), and thus can switch between the shielding state and the transmissive state on the basis of a control signal.
G02F 1/1347 - Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells
G02F 1/13 - Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
The device comprises: a food-loading platform on which the object food is loaded; cutting blades, of which both ends in the longitudinal direction are held by a cutting blade-securing frame; and a drive mechanism that moves the food-loading platform relative to the cutting blades in order to cut the object food into round slices. The cutting blades have protruding bosses at both ends in the longitudinal direction. Cutting blade-hooking members, each of which has a V-shaped groove for hooking the bosses of the cutting blades, are disposed on the cutting blade-securing frame along a pair of side edges. At least one of the cutting blade hooking members is provided with a tension adjustment member that can adjust the tension on the cutting blades by adjusting the distance from the other cutting blade hooking member. Cutting blade exchange and tension adjustment are simple, and even if the tension adjustment of individual cutting blades is approximate, a prescribed tension is applied on the cutting blades during food-cutting.
B26D 3/28 - Splitting layers from work; Mutually separating layers by cutting
B26D 1/02 - Cutting through work characterised by the nature or movement of the cutting member; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a stationary cutting member
B26D 1/03 - Cutting through work characterised by the nature or movement of the cutting member; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a stationary cutting member with a plurality of cutting members
B26D 3/26 - Cutting work characterised by the nature of the cut made; Apparatus therefor to obtain segments other than slices, e.g. cutting pies specially adapted for cutting fruit or vegetables, e.g. for onions
B26D 7/26 - Means for mounting or adjusting the cutting member; Means for adjusting the stroke of the cutting member
64.
Holding device of cylindrical body and microphone holder
b are provided at positions where a holding frame 5 and a clamp arm 6 overlap with each other such that different poles are opposed to each other. The magnets are magnetically attached to each other to lock the movement.
In a microphone holder, a microphone can be attached and detached by a one-touch operation and to be securely held. A microphone grip is pressed into between clamp arms in a state where front ends are opened. This causes the microphone grip to press rear ends of the clamp arms to swing the front ends in closing directions. Thus, the microphone can be attached and detached by a one-touch operation without causing collision noise and the like.
A dynamic microphone unit has a diaphragm 5 vibrating in response to sound waves, a voice coil 6 fixed to the diaphragm 5 and vibrating in cooperation with the diaphragm 5, a magnetic circuit including a magnetic gap around the voice coil 6 and generating a magnetic field in a magnetic gap, a first air chamber 11 adjacent to the reverse of the diaphragm 5 holding an acoustic resistance therein, a second air chamber 9 behind the voice coil, and a communication passage 22 for sound waves between the first air chamber 11 and the second air chamber 9.
a formed in a polygonal reticulate pattern is provided on one surface of the reinforcing film adhered with the adhesive, and a convex rib 8 corresponding to the groove is formed on the other surface.
c of a microphone body 20, which has a 3-pole output connector, is connected with current regulative diodes D2 and D3 as a feed circuit for the drain D of the FET Q1. A first AC coupling electrolytic capacitor C3 is connected to one of the current regulative diodes, D2, and a series circuit of a second AC coupling electrolytic capacitor C4 and a resistive element R3 is connected between the anode of the other current regulative diode D3 and a ground line L3. The resistive element R3 has substantially the same impedance as an output impedance of the transistor Q2.
[Problem] A food cutting device configured so that the cutting blade can easily enter food at the beginning of the start of cutting and the deformation of the food is reduced. [Solution] A food cutting device is provided with: a food placement table (5) on which food (10) to be cut is placed; a drive mechanism (6) for moving the food placement table (5); and a cutting blade (3) which, due to being affixed in the path of movement of the food (10) to be cut which is moved together with the food placement table (5) by the drive mechanism (6), cuts the food (10) to be cut into round slices. When the food (10) to be cut starts to be in contact with the cutting blade (3), the drive mechanism (6) continuously changes the angle of entry of the cutting blade (3) relative to the food (10) to be cut. The food cutting blade may also be provided with: a receiving member for receiving cut food; and a second drive mechanism for vertically driving the receiving member between a receiving position at which the receiving member receives the cut food and an extraction position at which the cut food is extracted.
A cooked rice molding method includes a first supplying step of spreading cooked rice in a plate form on rolling-up plates deployed horizontally, a second supplying step of placing a dried laver sheet and ingredients on the cooked rice, a first pressing step of folding a first rotating plate and a second rotating plate disposed on two sides of a base plate in a direction to erect at approximate right angles with respect to the base plate, and a second pressing step of folding the third rotating plate rotatably attached to the first rotating plate at a side opposite to the base plate, to a base plate side. Then, the method includes a repositioning step of deploying the rolling-up plates in the horizontal state, and rotating the cooked rice about 90 degrees on the rolling-up bamboo plate. Finally, the first pressing step is repeated again.
A digital transport system of the present invention is provided with: a transmitter, which has amplification means, A/D conversion means, first data processing means, and transmission means; and a receiver, which has reception means, second data processing means, and D/A conversion means. Therein, the first data processing means has: an assessment unit for assessing first digital data; a first generation unit for generating second digital data according to the assessment result thereof; and a sign bit imparting unit for imparting, to the least significant bit of the second digital data, a sign bit for identifying processing content of the first generation unit; and the second data processing means has a sign bit identification unit for identifying the sign bit which has been imparted to the least significant bit of the second digital data, and a second generation unit for generating third digital data according to the identification result thereof. Thereby, real-time transport which is of high grade and of low latency is achieved.
The earphone includes a driver unit; a housing accommodating the driver unit, the housing having a front face serving as a sound emitting surface and a bowl shaped rear face; a hollow casing provided separately from the housing, the casing being configured to increase an internal volume adjacent to the rear side of a vibrating plate and to reduce the back pressure of the vibrating plate; and a connecting channel connecting the rear face of the housing and the casing such that the housing is in communication with the internal space of the casing, in which the housing includes a sound emitting tube protruding from the front face thereof so as to be fitted into an external auditory meatus.
There is provided a dynamic microphone in which vibration noise generated by the rolling of a microphone unit caused by a vibration component perpendicular to the principal axis direction of the microphone is reduced effectively. In the dynamic microphone including a microphone unit 110, an inner cylinder 120 having a back air chamber in the structure thereof constituting a microphone body 10 together with the microphone unit 110, and a microphone casing 20 serving as an outer cylinder, in which a part of the inner cylinder 120 of the microphone body 10 is supported by a floating type vibration-proof structure using an elastic member 30, a weight 40 for causing the center of gravity O of the microphone body 10 to coincide with a supporting point S using the elastic member 30 is attached to the inner cylinder 120 so as to be preferably movable.
A condenser microphone has an output circuit comprising an emitter-follower circuit; an impedance converter comprising an FET and at least one transistor of the emitter-follower circuit provided next to the FET; and the transistor having an emitter terminal provided with a constant-voltage circuit. The FET included in the impedance converter is operated by a voltage supplied from the constant-voltage circuit.
A condenser microphone includes a support pipe made of a metallic material; a microphone body supported on a front end side of the support pipe, and including a microphone unit and an output module part having a sound signal output circuit and a shield housing; a proximal housing having an output connector therein and attached to a rear end side of the support pipe; a connecting member arranged between the support pipe and the shield housing; and a metal cover arranged in the connecting member and having a peripheral portion contacting with the shield housing. One end of a shield cover of a microphone cable and a ground part of the sound signal output circuit are connected electrically to the metal cover so that a complete shield in which a contact portion between the metal cover and the shield housing is a base point of grounding is formed.
The present invention relates to a capacitor microphone unit including a diaphragm, a fixed electrode that is arranged opposite to the diaphragm with a space provided between the diaphragm and the fixed electrode so that a capacitor is formed between the diaphragm and the fixed electrode, an insulating base that is disposed on a rear side of the fixed electrode and supports the fixed electrode, and a ring-shaped acoustic resistance material that is disposed on a front side of the insulating base, all of which are incorporated in a unit casing. A skin layer is formed on at least one of a front side and a rear side of the acoustic resistance material, and the skin layer has a higher density than that inside the acoustic resistance material, whereby acoustic resistance can be readily controlled.
H04R 1/00 - LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS - Details of transducers
A boundary microphone includes: a base made of metal; a cover that is made of metal and has a plurality of holes through which a sound wave is guided; a microphone unit that converts sound into an electric signal; and a microphone unit holder slidably provided on the base and holds the microphone unit. The microphone unit holder has a knob. The base has a hole through which the knob of the microphone unit holder penetrates the base. The knob of the microphone unit holder and the hole of the base are so provided that the microphone unit holder can be moved with the microphone unit by a movement of the knob within a range defined by the hole.
Diaphragms of a plurality of capacitor microphone units are arranged in the same plane and the capacitor microphone units are connected in series to make an output from an impedance converter connected to one capacitor microphone unit drives a ground side of another capacitor microphone unit connected to the impedance converter.
Disclosed is an earphone capable of effectively improving acoustic characteristics, in particular, acoustic characteristics in low pitch ranges without a vibrating plate for bass compensation and the like. Specifically disclosed is an earphone which comprises a driver unit, a housing that has a front face serving as a sound emitting surface and a bowl-shaped rear face and that accommodates the driver unit, a hollow casing formed separately from the housing so as to increase an internal volume adjacent to the rear side of a vibrating plate of the driver unit and thereby to reduce the back pressure of the vibrating plate, and a connecting channel that connects the rear face of the housing and the casing so that the inner space of the housing and that of the casing communicate with each other. The housing includes a sound emitting tube that protrudes from the front face thereof so as to be fitted into an external auditory meatus.
H04R 1/28 - Transducer mountings or enclosures designed for specific frequency response; Transducer enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
91.
Capacitor microphone and impedance converter therefor
An impedance converter for a capacitor microphone includes: a vacuum tube that receives an output signal from a capacitor microphone unit through a grid and with which the signal is output as an output from a cathode follower; an FET in cascade connection with the vacuum tube and that defines a current flowing in the vacuum tube; and a bias circuit that applies a bias voltage to the grid of the vacuum tube. The bias circuit includes: a first diode and a second diode that apply the bias voltage to the grid of the vacuum tube; the first diode and the second diode being connected in inverse parallel; and a bias resistor for applying the bias voltage at a constant level to the grid of the vacuum tube via the first diode or the second diode.
A narrow directional microphone includes: a microphone unit; an acoustic tube having an opening on a peripheral wall along an axial direction and incorporating the microphone unit; and, an acoustic resistor that covers the opening of the acoustic tube. The acoustic tube is overlapped with an air-shutoff sheet having a plurality of openings which have various lengths in the axial direction of the acoustic tube. The openings of the air-shutoff sheet overlap the opening of the acoustic tube so that a size of the opening of the acoustic tube is limited.
An infrared transmitter is obtained that transmits a signal by changing a luminance of an infrared emitting LED, the infrared transmitter including: a transmission signal generating unit; a biasing voltage generating unit that generates a biasing voltage according to a magnitude of a transmission signal; a signal/voltage mixing unit that mixes the transmission signal and the biasing voltage; and a voltage-current conversion unit that converts a voltage into a current, in which the LED is driven by the current obtained by the conversion in the voltage-current conversion unit, so that power consumption efficiency can be improved.
H04B 10/00 - Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
Noise canceling headphones designed so that external noise coming from all directions can be effectively cancelled by means of a canceling sound before being heard by a user. These feed-forward noise canceling headphones use noise canceling headphones (10), each of which comprises an air chamber (8) formed from a space that is sealed by a member covering the outer circumference of the housing and provided more outward than a front air chamber (7), and wherein the sound-wave introducing part of a microphone (2) is inside the air chamber (8).
G10K 11/178 - Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
An audio conference system including a controller, a plurality of microphones, and an antenna that makes the controller and the microphones communicate via radio communication, in which the controller includes: an utterance permitting unit that, in response to utterance request instruction information received from any of the microphones, transmits utterance permission instruction information to the microphone; and an utterance inhibiting unit that, in response to utterance inhibition request instruction information received from any of the microphones, transmits utterance inhibition instruction information to the other microphones, and the microphones each include: an utterance requesting unit that transmits utterance request instruction information to the controller and transmits, to the controller, a speech signal input after receiving the utterance permission instruction information from the controller; and an utterance stopping unit that stops transmission of the speech signal to the controller upon receiving the utterance inhibition instruction information from the controller. According to the audio conference system, an audio conference system which allows the chair of a conference to collectively inhibit all utterances of the other participants can be obtained.
It is possible to shorten a delay time from utterance to output from a speaker even in a conference audio system including an automatic mute release device. An A/D converter that converts audio signals from a plurality of microphones into digital signals, an audio level detector that detects utterance or silence depending on the level of the converted digital signal, an audio data storage unit that temporarily stores the digital signal for which the audio level detector detected utterance, a controller that controls the storage of audio data in the audio data storage unit and the reading of the audio data, and a D/A converter that converts the read audio data into analog audio signals are provided. The controller hastens read timing of the audio data in accordance with a time period of silent portion when the audio level detector detects silence in a series of the audio data.
A wireless microphone which converts sound waves to electrical voice signals and transmits the voice signals via radio waves. The wireless microphone comprises a storage means which stores a set value consisting of a combination of the transmission frequency and transmission output of the radio waves of the wireless microphone in association with identification information, an acquisition means which acquires the identification information from outside of the microphone, a means which reads the set value stored in the storage means, on the basis of the identification information acquired by the acquisition means, and a means which transmits the radio waves obtained by modulating the voice signals, on the basis of the read set value. The wireless microphone and a wireless microphone system allow automatic setting of a legitimate transmission frequency and transmission output corresponding to an area of use.
Provided is a noise cancel headphone which is capable of cancelling ambient noise and allowing listening to only music and which is capable of suppressing a noise component the source of which is the noise cancel headphone. The noise cancel headphone comprises a microphone for converting the environmental noise into an electric signal, a cancel signal generating means for generating a cancel signal for cancelling the noise signal converted by the microphone, and a speaker driven by an audio signal and the cancel signal and is provided with a residual noise suppressing low-pass filter circuit for filtering a low-pass component of the cancel signal, a reference voltage circuit for generating the voltage which is the reference of the detection level of the noise signal, a determination circuit for detecting the level of the noise signal by comparing the noise signal with the reference voltage and outputting a control signal indicating the result of the detection, and a switch circuit for controlling the operation of the residual noise suppressing low-pass filter circuit according to the control signal.
G10K 11/178 - Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
Provided is a noise-canceling headphone, which is enabled to keep satisfactory acoustic characteristics by utilizing a constitution intrinsic thereto, when the generation of noises to be caused by the coming electromagnetic waves is prevented to prevent the howling which might otherwise be caused by the mechanical vibrations of a microphone unit. The noise-canceling headphone comprises a headphone unit having a diaphragm driven by voice signals for generating sound waves, a microphone unit for detecting the environmental noises, a housing covering the back side of the headphone unit, and a cancel signal generating circuit for generating a cancel signal having the phase opposite to that of the environmental noise signals detected by the microphone unit, to input the cancel signal to the headphone unit. The microphone unit is fixed in the housing, in which a recessed portion is formed, and is so housed in the recessed portion as is covered with an elastic conductive member.
Provided are a headphone unit and headphones with little variability in acoustic resistance value, and that do not require the addition of acoustic resistance material as a separate member due to configuring acoustic resistance utilizing the viscous resistance of air. The components are a unit frame, a magnetic circuit component member affixed to the unit frame, a voice coil positioned inside a magnetic gap formed by the magnetic circuit component member, and a diaphragm affixed to the unit frame by its circumferential edge and to which the voice coil is also affixed, and that vibrates in conjunction with the voice coil. An acoustic resistance comprising a thin air layer is formed between the frame unit and the magnetic circuit component member.
H04R 1/28 - Transducer mountings or enclosures designed for specific frequency response; Transducer enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
