The invention relates to a method and a device for optimizing the radiofrequency power of an FM radio broadcasting transmitter by determining mono and stereo modulation content and setting the broadcast transmitter output power level accordingly. The transmitter power output is optimized by identifying whether the modulation content fed into the broadcast exciter is mono or stereo and dynamically adjusting the transmitter power output based on the modulation content. Alternatively, the optimization occurs by processing modulation content fed into the broadcast exciter to generate an MPX signal or mono MPX signal and an encoded power target, followed by a step of placing the MPX signal and the encoded power target on separate channels, and finally decoding the encoded power target to dynamically adjust the transmitter power output. A broadcast exciter with optimized transmitter output is also provided.
H04H 20/65 - Dispositions caractérisées par des systèmes de transmission pour la radiodiffusion
H04H 20/48 - Dispositions caractérisées par des circuits ou composants spécialement adaptés à la radiodiffusion spécialement adaptés aux systèmes de radiodiffusion couverts par les groupes spécialement adaptés aux systèmes de radiodiffusion stéréophonique aux systèmes de radiodiffusion stéréophonique en modulation de fréquence
H04H 20/88 - Systèmes de radiodiffusion stéréophonique
2.
IBOC compatible superposition modulation by independent modulators utilizing clipping noise from peak-to-average power reduction
According to an aspect of the present invention, there is provided a method for providing additional bandwidth to receivers that can decode a higher modulation comprising trading a peak-to-average power ratio (PAPR) reduction induced constellation noise of all or a subset of in-band on-channel (IBOC) carriers within an orthogonal frequency division multiplexing (ODFM) waveform with data carrying superposition modulation.
H04K 1/02 - Communications secrètes par addition d'un second signal pour rendre le signal désiré inintelligible
H04L 25/03 - Réseaux de mise en forme pour émetteur ou récepteur, p. ex. réseaux de mise en forme adaptatifs
H04L 25/49 - Circuits d'émissionCircuits de réception à conversion de code au transmetteurCircuits d'émissionCircuits de réception à pré-distorsionCircuits d'émissionCircuits de réception à insertion d'intervalles morts pour obtenir un spectre de fréquence désiréCircuits d'émissionCircuits de réception à au moins trois niveaux d'amplitude
H04L 27/26 - Systèmes utilisant des codes à fréquences multiples
H04L 27/18 - Systèmes à courant porteur à modulation de phase, c.-à-d. utilisant une manipulation à décalage de phase
H04H 40/18 - Dispositions caractérisées par des circuits ou composants spécialement adaptés à la réception
H04L 5/02 - Canaux caractérisés par le type de signal
3.
SYSTEMS AND METHOD FOR CONSISTENT FM/HD1 DIVERSITY DELAY
A broadcast system may have less restrictive timing constraints by providing synchronous processing chains for the HD audio portion and the FM audio portion so that no samples are added or removed from when the input audio is first sampled at an input rate and when the signals are combined and output by a digital analog converter operating at an output rate. The signals can be buffered within the synchronous processing paths and the state of the buffer can be used to control the input rate of the sampler. Graceful change over across multiple input sources can be achieved provided all input source input rates are controlled to by the overall output rate and all input sources are phase aligned to produce output symbols at the same time.
H04H 20/30 - Dispositions de radiodiffusion simultanée de plusieurs informations par un canal unique
G10L 19/24 - Codecs à débit variable, p. ex. pour générer différentes qualités en utilisant une représentation évolutive comme le codage hiérarchique ou le codage par couches
A broadcast system may have less restrictive timing constraints by providing synchronous processing chains for the HD audio portion and the FM audio portion so that no samples are added or removed from when the input audio is first sampled at an input rate and when the signals are combined and output by a digital analog converter operating at an output rate. The signals can be buffered within the synchronous processing paths and the state of the buffer can be used to control the input rate of the sampler. Graceful change over across multiple input sources can be achieved provided all input source input rates are controlled to by the overall output rate and all input sources are phase aligned to produce output symbols at the same time.
5.
IBOC compatible superposition modulation by independent modulators utilizing clipping noise from peak-to-average power reduction
According to an aspect of the present invention, there is provided a method for providing additional bandwidth to receivers that can decode a higher modulation comprising trading a peak-to-average power ratio (PAPR) reduction induced constellation noise of all or a subset of in-band on-channel (IBOC) carriers within an orthogonal frequency division multiplexing (ODFM) waveform with data carrying superposition modulation.
H04K 1/02 - Communications secrètes par addition d'un second signal pour rendre le signal désiré inintelligible
H04L 25/03 - Réseaux de mise en forme pour émetteur ou récepteur, p. ex. réseaux de mise en forme adaptatifs
H04L 25/49 - Circuits d'émissionCircuits de réception à conversion de code au transmetteurCircuits d'émissionCircuits de réception à pré-distorsionCircuits d'émissionCircuits de réception à insertion d'intervalles morts pour obtenir un spectre de fréquence désiréCircuits d'émissionCircuits de réception à au moins trois niveaux d'amplitude
H04L 27/26 - Systèmes utilisant des codes à fréquences multiples
H04L 27/18 - Systèmes à courant porteur à modulation de phase, c.-à-d. utilisant une manipulation à décalage de phase
H04H 40/18 - Dispositions caractérisées par des circuits ou composants spécialement adaptés à la réception
H04L 5/02 - Canaux caractérisés par le type de signal
6.
IBOC COMPATIBLE SUPERPOSITION MODULATION BY INDEPENDENT MODULATORS UTILIZING CLIPPING NOISE FROM PEAK-TO-AVERAGE POWER REDUCTION
According to an aspect of the present invention, there is provided a method for providing additional bandwidth to receivers that can decode a higher modulation comprising trading a peak-to-average power ratio (PAPR) reduction induced constellation noise of all or a subset of in-band on-channel (IBOC) carriers within an orthogonal frequency division multiplexing (ODFM) waveform with data carrying superposition modulation.
A system for peak-to-average-power ratio (PAPR) reduction of a frequency shifted plurality of digital broadcast signals taking into account the combined signal peaks in order to transmit the signals more efficiently in a single broadcast transmission system. The PAPR algorithm takes into account a rotating constellation phase offset for the shifted signals corresponding to the amount of applied frequency shift. In the case of a dual sideband In-Band-On-Channel (IBOC) signal typically used in conjunction with an FM carrier in the center, the sidebands can be interleaved to create a new IBOC signal definition and take the place of the FM carrier for an all-digital transmission that is backward compatible with IBOC receivers allowing for a gradual migration to all digital broadcasting.
H04L 27/26 - Systèmes utilisant des codes à fréquences multiples
H01L 33/00 - DISPOSITIFS À SEMI-CONDUCTEURS NON COUVERTS PAR LA CLASSE - Détails
H01L 33/48 - DISPOSITIFS À SEMI-CONDUCTEURS NON COUVERTS PAR LA CLASSE - Détails caractérisés par les éléments du boîtier des corps semi-conducteurs
H01L 33/60 - DISPOSITIFS À SEMI-CONDUCTEURS NON COUVERTS PAR LA CLASSE - Détails caractérisés par les éléments du boîtier des corps semi-conducteurs Éléments de mise en forme du champ optique Éléments réfléchissants
H01L 33/62 - Dispositions pour conduire le courant électrique vers le corps semi-conducteur ou depuis celui-ci, p.ex. grille de connexion, fil de connexion ou billes de soudure
H01L 33/64 - DISPOSITIFS À SEMI-CONDUCTEURS NON COUVERTS PAR LA CLASSE - Détails caractérisés par les éléments du boîtier des corps semi-conducteurs Éléments d'extraction de la chaleur ou de refroidissement
H04H 20/00 - Dispositions de radiodiffusion ou de distribution couplées à la radiodiffusion
A system for peak-to-average-power ratio (PAPR) reduction of a frequency shifted plurality of digital broadcast signals taking into account the combined signal peaks in order to transmit the signals more efficiently in a single broadcast transmission system. The PAPR algorithm takes into account a rotating constellation phase offset for the shifted signals corresponding to the amount of applied frequency shift. In the case of a dual sideband In-Band-On-Channel (IBOC) signal typically used in conjunction with an FM carrier in the center, the sidebands can be interleaved to create a new IBOC signal definition and take the place of the FM carrier for an all-digital transmission that is backward compatible with IBOC receivers allowing for a gradual migration to all digital broadcasting.
A system for peak-to-average-power ratio (PAPR) reduction of a frequency shifted plurality of digital broadcast signals taking into account the combined signal peaks in order to transmit the signals more efficiently in a single broadcast transmission system. The PAPR algorithm takes into account a rotating constellation phase offset for the shifted signals corresponding to the amount of applied frequency shift. In the case of a dual sideband In-Band-On-Channel (IBOC) signal typically used in conjunction with an FM carrier in the center, the sidebands can be interleaved to create a new IBOC signal definition and take the place of the FM carrier for an all-digital transmission that is backward compatible with IBOC receivers allowing for a gradual migration to all digital broadcasting.
H04H 20/95 - Dispositions caractérisées par des caractéristiques techniques particulières de l'information radiodiffusée, p. ex. par la forme du signal ou par le format des informations caractérisés par un format spécifique, p. ex. un flux audio codé
H04H 20/30 - Dispositions de radiodiffusion simultanée de plusieurs informations par un canal unique
H04H 20/46 - Dispositions caractérisées par des circuits ou composants spécialement adaptés à la radiodiffusion spécialement adaptés aux systèmes de radiodiffusion couverts par les groupes
H04H 60/27 - Dispositions d'enregistrement ou d'accumulation des informations radiodiffusées ou des informations relatives à la radiodiffusion
A system for peak-to-average-power ratio (PAPR) reduction of a frequency shifted plurality of digital broadcast signals taking into account the combined signal peaks in order to transmit the signals more efficiently in a single broadcast transmission system. The PAPR algorithm takes into account a rotating constellation phase offset for the shifted signals corresponding to the amount of applied frequency shift. In the case of a dual sideband In- Band-On-Channel (IBOC) signal typically used in conjunction with an FM carrier in the center, the sidebands can be interleaved to create a new IBOC signal definition and take the place to the FM carrier for an all-digital transmission that is backward compatible with IBOC receivers allowing for a gradual migration to all digital broadcasting.
A method of reducing peak-to-average power in a hybrid signal is provided. The method determines peaks in power by defining a sample point by way of a digital vector and an analog vector. The digital and analog vectors are added together to generate a hybrid vector which is used to compare the sample point to the maximum desired peak threshold. An error vector is used to correct the sample point to a desired power level. Once the sample point has been corrected it can be added back to the analog signal and transmitted.
H04L 27/28 - Systèmes utilisant des codes à fréquences multiples à émission simultanée de fréquences différentes, chacune représentant un élément de code
H04L 27/26 - Systèmes utilisant des codes à fréquences multiples
A transmitter and method for determining impedance measurement in an active radio frequency transmitter of an antenna are provided. Voltage and current samples are obtained from a modulating signal delivered to an antenna. The voltage and current samples are converted from analog to digital format, and decimation occurs to reduce the number of samples. Complex demodulation is performed of each of the voltage and current samples to baseband levels and decimation of the voltage and current samples is performed to reduce the number of samples. An impedance estimate can then be estimated from the voltage and current samples.
H03C 1/62 - Modulateurs dans lesquels l'amplitude de la composante de la porteuse à la sortie dépend du niveau du signal modulateur, p. ex. absence de porteuse quand il n'y a pas de signal modulateur
13.
Amplifier providing power recovery from a narrow-band antenna
A method, amplifier and system are provided for enabling power recovery from a narrow-band antenna when a signal having bandwidth exceeding that of the antenna is utilized. The amplifier provides amplification of a source signal to the antenna and recovery of power stored in the antenna during periods when the impedance of the antenna is negative to enable reverse current through the amplifier to a direct current (DC) power source.
A method of reducing peak-to-average power in a hybrid signal is provided. The method determines peaks in power by defining a sample point by way of a digital vector and an analog vector. The digital and analog vectors are added together to generate a hybrid vector which is used to compare the sample point to the maximum desired peak threshold. An error vector is used to correct the sample point to a desired power level. Once the sample point has been corrected it can be added back to the analog signal and transmitted.
A method, amplifier and system are provided for enabling power recovery from a narrow-band antenna when a signal having bandwidth exceeding that of the antenna is utilized. The amplifier provides amplification of a source signal to the antenna and recovery of power stored in the antenna during periods when the impedance of the antenna is negative to enable reverse current through the amplifier to a direct current (DC) power source.
A transmitter and method for determining impedance measurement in an active radio frequency transmitter of an antenna are provided. Voltage and current samples are obtained from a modulating signal delivered to an antenna. The voltage and current samples are converted from analog to digital format, and decimation occurs to reduce the number of samples. Complex demodulation is performed of each of the voltage and current samples to baseband levels and decimation of the voltage and current samples is performed to reduce the number of samples. An impedance estimate can then be estimated from the voltage and current samples.
H03C 1/62 - Modulateurs dans lesquels l'amplitude de la composante de la porteuse à la sortie dépend du niveau du signal modulateur, p. ex. absence de porteuse quand il n'y a pas de signal modulateur
A method of reducing peak-to-average power in a hybrid signal is provided. The method determines peaks in power by defining a sample point by way of a digital vector and an analog vector. The digital and analog vectors are added together to generate a hybrid vector which is used to compare the sample point to the maximum desired peak threshold. An error vector is used to correct the sample point to a desired power level. Once the sample point has been corrected it can be added back to the analog signal and transmitted.
A method of reducing peak-to-average power in a hybrid signal is provided. The method determines peaks in power by defining a sample point by way of a digital vector and an analog vector. The digital and analog vectors are added together to generate a hybrid vector which is used to compare the sample point to the maximum desired peak threshold. An error vector is used to correct the sample point to a desired power level. Once the sample point has been corrected it can be added back to the analog signal and transmitted.
A method that uses time-domain processing on a spectrally efficient digital modulation scheme to reduce the bandwidth expansion in envelope elimination and restoration (EER) amplifiers is disclosed. The method identifies and localizes sections of the signal responsible for the out of band emissions, or spectral regrowth, using a filter. The detected sections are flagged and extended to allow for introduction of a lower frequency transition in place of the extended section, thus reducing spectral regrowth from the output of an EER amplifier. The method is particularly useful for improving the quality of digital AM radio transmission.
H04K 1/10 - Communications secrètes en utilisant deux signaux transmis simultanément ou successivement
H04L 27/28 - Systèmes utilisant des codes à fréquences multiples à émission simultanée de fréquences différentes, chacune représentant un élément de code
20.
Point to multipoint reliable protocol for synchronous streaming data in a lossy IP network
J Radio Exciters. The Receivers may also be configured to keep track of the packet numbers and request re-transmission of lost packets, using the ARQ (Automatic Retransmission Request) scheme.
G06F 15/16 - Associations de plusieurs calculateurs numériques comportant chacun au moins une unité arithmétique, une unité programme et un registre, p. ex. pour le traitement simultané de plusieurs programmes
H04J 1/00 - Systèmes multiplex à division de fréquence
G01R 31/08 - Localisation de défauts dans les câbles, les lignes de transmission ou les réseaux
An automatic matching and tuning unit (AMTU), which connects the output from a low or medium frequency, high power radio transmitter, which requires a 50 ohm terminating impedance, to an antenna with an input impedance comprising low resistance in series with a high capacitive reactance. Sensors measure the phase angle between the input current and voltage. The inductance of a series connected loading coil is continuously varied to resonate the antenna capacitance. The resulting input resistance is transformed to 50 ohms using a matching transformer and pair of resonant, mutually coupled coils with adjustable mutual coupling. Sensors measure the input resistance and continuously adjust the mutual coupling coefficient to maintain the required 50 ohm input impedance. Sensors measure the antenna current and vary the transmitter power level to keep it constant. A microcontroller processes all of the sensor outputs and provides serial communication with the transmitter.
