| Patent Number |
Title Of Patent |
Date Issued |
| 7551675 |
Method and apparatus for synchronized transmission and reception of data in a digital audio broa |
June 23, 2009 |
| A method of transmitting digital audio broadcasting signals comprises the steps of generating a plurality of output frames of information to be transmitted, wherein each of the output frames includes a plurality of blocks of data and each of the output frames is synchronized with an |
| 7542517 |
Peak-to-average power reduction for FM OFDM transmission |
June 2, 2009 |
| A method of reducing peak-to-average power ratio in an OFDM signal comprises the steps of modulating a set of subcarriers with a set of data symbol vectors to produce a first modulated signal, limiting the magnitude of the first modulated signal to produce a first limited modulated s |
| 7512175 |
Method for synchronizing exporter and exciter clocks |
March 31, 2009 |
| A method for synchronizing an exciter clock with a modem frame clock in a broadcasting system comprises the steps of receiving a plurality of modem frame pulses that are representative of the start of modem frames of audio signals and data signals, wherein timing of the modem frame pulse |
| 7474707 |
Bandwidth reduction of an FM broadcast signal using a baseband precompensation technique |
January 6, 2009 |
| A method of processing a baseband multiplex signal comprises the steps of frequency modulating the baseband multiplex signal to produce a first modulated signal, filtering the first modulated signal to produce a first filtered signal, demodulating the filtered signal to produce a dem |
| 7464324 |
Method and apparatus for forward error correction coding for an AM in-band on-channel digital au |
December 9, 2008 |
| A method of digital audio broadcasting comprises the steps of providing a plurality of bits of digital information to be transmitted, forward error correcting the bits of digital information using a combination of pragmatic trellis code modulation and complementary punctured code, and |
| 7340010 |
Forward error correction coding for hybrid AM in-band on-channel digital audio broadcasting syst |
March 4, 2008 |
| An AM compatible digital audio broadcasting signal comprises an analog modulated carrier signal centrally positioned in a radio channel, wherein the analog modulated carrier signal is modulated by an analog signal, and a plurality of digitally modulated subcarrier signals in the radio |
| 7305056 |
Coherent tracking for FM in-band on-channel receivers |
December 4, 2007 |
| A method for coherently tracking a radio signal including at least one digitally modulated reference carrier is provided, wherein the method comprises the steps of demodulating the reference carrier to produce complex coherent reference gains, detecting a transient that affects the c |
| 7221917 |
Adjacent channel interference mitigation for FM digital audio broadcasting receivers |
May 22, 2007 |
| A method of receiving an FM digital audio broadcasting signal including a first plurality of subcarriers in an upper sideband of a radio channel and a second plurality of subcarriers in a lower sideband of the radio channel comprises the steps of mixing the digital audio broadcasting |
| 7127008 |
Coherent AM demodulator using a weighted LSB/USB sum for interference mitigation |
October 24, 2006 |
| A method of processing an AM radio signal comprises the step of receiving an AM radio signal including an upper sideband portion and a lower sideband portion, demodulating the upper sideband portion and the lower sideband portion to produce a demodulated upper sideband signal and a d |
| 7043681 |
Digital audio broadcasting method and apparatus using complementary pattern-mapped convolutional |
May 9, 2006 |
| A method of transmitting digital information comprises the steps of forward error correction encoding a plurality of bits of digital information using complementary pattern-mapped convolutional codes, modulating a plurality of carrier signals with the forward error corrected bits, an |
| 6982948 |
Method and apparatus for transmission and reception of FM in-band on-channel digital audio broad |
January 3, 2006 |
| A transmitter for transmitting data in a digital audio broadcasting system includes a signal generator for providing a plurality of orthogonal frequency division multiplexed sub-carriers, with the sub-carriers including data sub-carriers and reference sub-carriers, and a modulator fo |
| 6898249 |
Method and apparatus for AM digital audio broadcasting with amplitude scaled tertiary subcarrier |
May 24, 2005 |
| A method of in-band on-channel (IBOC) digital audio broadcasting (DAB) comprises the steps of providing an analog modulated carrier signal in a central frequency band of an AM radio channel, providing a first plurality of subcarriers in an upper sideband of the AM radio channel, providin |
| 6895060 |
Adaptive weighting method for orthogonal frequency division multiplexed soft symbols using chann |
May 17, 2005 |
| A method for weighting orthogonal frequency division multiplexed soft symbols is provided, including the steps of receiving a plurality of sub-carriers modulated by digital information and filtering the sub-carriers to produce complex soft decision outputs. The magnitudes of the soft |
| 6798849 |
AM digital audio broadcasting with analog signal pre-compensation |
September 28, 2004 |
| A method for pre-compensating an analog signal in a composite digital audio broadcasting signal including the analog signal and a plurality of digitally modulated sub-carrier signals, the method comprising the steps of sampling the analog signal to obtain successive blocks of samples, |
| 6735257 |
Audio blend method and apparatus for AM and FM in-band on-channel digital audio broadcasting |
May 11, 2004 |
| A method is provided for transmitting a composite digital audio broadcast signal having an analog portion and a digital portion to mitigate intermittent interruptions in the reception of said digital audio broadcast signal. The method comprises the steps of arranging symbols represen |
| 6721337 |
Method and apparatus for transmission and reception of compressed audio frames with prioritized |
April 13, 2004 |
| A method for transmission of compressed data for a digital audio broadcasting system comprises the steps of producing digital information representative of an audio signal; estimating the number of bits to be allocated to the digital information in a modem frame; encoding the digital |
| 6671340 |
Method and apparatus for reduction of interference in FM in-band on-channel digital audio broadc |
December 30, 2003 |
| This invention provides a method for reducing radio frequency interference in an FM in-band on-channel digital audio broadcasting receiver. The method comprises the steps of receiving a composite signal including a signal of interest and an interfering signal, demodulating the composite |
| 6639949 |
Method and apparatus for pulse overlap pre-compensation in digitally modulated signals |
October 28, 2003 |
| A method of pre-compensating for pulse overlap in a digitally modulated signal comprises the steps of receiving a sequence of pulses, modulating the pulses to produce a first sequence of modulated pulses, demodulating the first sequence of modulated pulses to produce a first sequence of |
| 6622008 |
Method and apparatus for reduction of FM interference for FM in-band on-channel digital audio br |
September 16, 2003 |
| This invention provides a method for reducing FM interference in an in-band on-channel digital audio broadcasting system. The method includes the steps of receiving a composite signal including a signal of interest and an interfering signal and normalizing the composite signal to produce |
| 6590944 |
Audio blend method and apparatus for AM and FM in band on channel digital audio broadcasting |
July 8, 2003 |
| A method is provided for processing a composite digital audio broadcast signal to mitigate intermittent interruptions in the reception of said digital audio broadcast signal. The method includes the steps of separating an analog modulated portion of the digital audio broadcast signal |
| 6549544 |
Method and apparatus for transmission and reception of FM in-band on-channel digital audio broad |
April 15, 2003 |
| A method for transmission of data in a digital audio broadcasting system includes the steps of providing a plurality of orthogonal frequency division multiplexed sub-carriers, with the sub-carriers including data sub-carriers and reference sub-carriers, and modulating the data sub-ca |
| 6523147 |
Method and apparatus for forward error correction coding for an AM in-band on-channel digital au |
February 18, 2003 |
| A method for digital audio broadcasting comprises the steps of providing a plurality of bits of digital information to be transmitted, interleaving the bits of digital information into a plurality of partitions, forward error correcting the bits of digital information using a combination |
| 6487256 |
Method and apparatus for AM digital broadcasting |
November 26, 2002 |
| A method for AM in-band-on-channel (IBOC) digital audio broadcasting (DAB) uses a center channel signal in a central frequency band of an AM radio channel, the center channel signal is modulated by first and second versions of the program material to be transmitted. Sub-carriers in a |
| 6430227 |
FM in-band-on-channel digital audio broadcasting method and system |
August 6, 2002 |
| This invention provides a method of broadcasting including the steps of providing a broadcast signal in a central frequency band of an FM radio channel; providing a first plurality of sub-carriers in an upper sideband of the FM radio channel; providing a second plurality of sub-carriers |
| 6345377 |
Digital audio broadcasting method using puncturable convolutional code |
February 5, 2002 |
| A broadcasting method comprising the steps of encoding program material using codes including a first set of bits and a second set of bits, the first set of bits contributing a greater coding gain to the codes than the second set of bits, modulating a plurality of orthogonal frequency |
| 6317470 |
Adaptive weighting method for orthogonal frequency division multiplexed soft symbols using chann |
November 13, 2001 |
| A method for weighting orthogonal frequency division multiplexed soft symbols is provided, including the steps of receiving a plurality of sub-carriers modulated by digital information and filtering the sub-carriers to produce complex soft decision outputs. The magnitudes of the soft |
| 6259893 |
Method and apparatus for reduction of FM interference for FM in-band on-channel digital audio br |
July 10, 2001 |
| This invention provides a method for reducing FM interference in an in-band on-channel digital audio broadcasting system. The method includes the steps of receiving a composite signal including a signal of interest and an interfering signal and normalizing the composite signal to produce |
| 6243424 |
Method and apparatus for AM digital broadcasting |
June 5, 2001 |
| A method for AM in-band-on-channel (IBOC) digital audio broadcasting (DAB) uses a center channel signal in a central frequency band of an AM radio channel, the center channel signal is modulated by first and second versions of the program material to be transmitted. Sub-carriers in a |
| 6148007 |
Method for data transmission in a digital audio broadcasting system |
November 14, 2000 |
| A method of broadcasting digitally encoded information includes the transmission of a plurality of orthogonal frequency division multiplexed sub-carriers. The sub-carriers are modulated by a digitally encoded signal representative of data to be transmitted, with the digitally encoded |
| 6128350 |
Method and apparatus for reducing peak to average power ratio in digital broadcasting systems |
October 3, 2000 |
| This invention provides a method for reducing peak to average power ratio in a radio frequency signal. The method comprises the steps of modulating a plurality of sub-carriers with a plurality of data symbol vectors to produce a first modulated signal; limiting the magnitude of the first |
| 6108810 |
Digital audio broadcasting method using puncturable convolutional code |
August 22, 2000 |
| A broadcasting method encodes program material using convolutional codes having non-puncturable bits and puncturable bits and modulates orthogonal frequency division multiplexed carrier signals with the convolutional codes. The non-puncturable bits are carried by a first group of the |
| 6002364 |
Apparatus and method for beam steering control system of a mobile satellite communications anten |
December 14, 1999 |
| A beam steering control for a mobile satellite communications antenna, includes an antenna having a steering mechanism; a dynamic rate sensor for producing a signal related to the rate of change of position of a vehicle to which the antenna is mounted; and a control system for controllin |
