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1. 发明公开

EP3610589A1 GUIDE GENERATION FOR MUSIC-RELATED CONTENT 无效
公开(公告)号：EP3610589A1
公开(公告)日：2020-02-19
申请号：EP18784391.7
申请日：2018-04-09
申请人： Ibiquity Digital Corporation
发明人： CARLOCK, Jason
IPC分类号： H04H60/37 , H04H20/12 , H04H20/57 , G06F17/30 , G06F3/16

2. 发明公开

EP3391562A1 METHOD AND APPARATUS FOR LEVEL CONTROL IN BLENDING AN AUDIO SIGNAL IN AN IN-BAND ON-CHANNEL RADIO SYSTEM 有权
公开(公告)号：EP3391562A1
公开(公告)日：2018-10-24
申请号：EP16843241.7
申请日：2016-12-16
申请人： Ibiquity Digital Corporation
发明人： OLOCHWOSZCZ, Gabriel S. , PAHUJA, Ashwini , VINCELETTE, Scott
IPC分类号： H04H20/22 , H04H60/12 , H04H20/26
CPC分类号： H03G3/3005 , G10L19/167 , H03G3/002 , H04H20/22 , H04H20/26 , H04H20/47 , H04H40/36 , H04H2201/18
摘要： A method for processing a digital audio broadcast signal includes: separating an analog audio portion and a digital audio portion of the digital audio broadcast signal; determining the loudness of the analog audio portion and the digital audio portion over a first short time interval; using the loudness of the analog and digital audio portions to calculate a short term average gain; determining a long term average gain; converting one of the long term average gain or the short term average gain to dB; if an output has been blended to digital, adjusting a digital gain parameter by a preselected increment to produce a digital gain parameter; if an output has not been blended to digital, setting the digital gain parameter to the short term average gain; providing the digital gain parameter to an audio processor; and repeating the above steps using a second short time interval.

3. 发明公开

EP3332495A1 SYSTEM AND METHOD FOR SYNCHRONOUS PROCESSING OF ANALOG AND DIGITAL PATHWAYS IN A DIGITAL RADIO RECEIVER 有权
公开(公告)号：EP3332495A1
公开(公告)日：2018-06-13
申请号：EP16759894.5
申请日：2016-07-25
申请人： Ibiquity Digital Corporation
发明人： NEKHAMKIN, Michael , CHEN, Hangjun , LI, Linlin
IPC分类号： H04H20/30 , H04H60/11 , H04H40/18
CPC分类号： H04L7/0041 , H04B1/16 , H04H20/30 , H04H40/18 , H04H60/11 , H04H2201/18 , H04L7/0029 , H04L7/0079 , H04L12/18 , H04L27/2647 , H04L27/2662 , H04W56/005
摘要： A method of processing a digital radio broadcast signal in a digital radio receiver includes: receiving baseband signal samples at a first sample rate; adjusting the sample rate of the baseband signals based on a difference between a receiver clock and a transmitter clock to produce adjusted baseband signal samples at a second sample rate; filtering the adjusted baseband signal samples to separate a digital component of the samples and an analog component of the samples, wherein the digital component and the analog component are synchronous; and separately demodulating the digital component and the analog component to produce a digital output signal and an analog output signal. A receiver that uses the method is also provided.

4. 发明公开

EP1969758A2 SYMBOL TRACKING FOR AM IN-BAND ON-CHANNEL RADIO RECEIVERS 有权
标题翻译： SYMBOL跟踪AM波段AUFKANAL无线电接收机
公开(公告)号：EP1969758A2
公开(公告)日：2008-09-17
申请号：EP06837439.6
申请日：2006-11-13
申请人： IBIQUITY DIGITAL CORPORATION
发明人： KROEGER, Brian, W. , WANG, Kun
IPC分类号： H04L7/02
CPC分类号： H04L27/2662 , H04H20/36
摘要： A method for symbol tracking in AM in-band on-channel radio receivers comprises the steps of: receiving a stream of time domain samples; assembling a set of the time domain samples equal to a symbol time plus a half symbol delay in response to a symbol timing adjustment value for each symbol period; interpolating the time domain samples; partitioning the interpolated time domain samples into a first group of samples representing half-off symbols and a second group of samples representing on-time symbols; processing the first and second groups of samples to produce the symbol timing adjustment value; and outputting the second group of samples representing on-time symbols at a symbol rate. An apparatus that performs the method is also included.

5. 发明授权

EP1597820B1 COHERENT AM DEMODULATOR USING A WEIGHTED LSB/USB SUM FOR INTERFERENCE MITIGATION 有权
标题翻译：带权LSB / USB SUM相干AM解调器减少干扰
公开(公告)号：EP1597820B1
公开(公告)日：2007-07-25
申请号：EP04706512.3
申请日：2004-01-29
申请人： IBIQUITY DIGITAL CORPORATION
发明人： KROEGER, Brian, William
IPC分类号： H03D1/24
CPC分类号： H03D1/2245 , H03D1/04
摘要： 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 demodulated lower sideband signal, weighting the demodulated upper sideband signal and the demodulated lower sideband signal in response to noise power to produce a weighted demodulated upper sideband signal and a weighted demodulated lower sideband signal, and combining the weighted demodulated upper sideband signal and the weighted demodulated lower sideband signal to produce an output signal. Demodulators which process AM radio signals in accordance with the method, and receivers incorporating the demodulators, are also included.

6. 发明授权

EP1119928B1 METHOD FOR EQUALIZATION OF COMPLEMENTARY CARRIERS IN AN AM COMPATIBLE DIGITAL AUDIO BROADCAST SYSTEM 有权
标题翻译：方法在友好的数字广播系统的均衡互补货船
公开(公告)号：EP1119928B1
公开(公告)日：2004-05-26
申请号：EP99945484.6
申请日：1999-09-02
申请人： IBIQUITY DIGITAL CORPORATION
发明人： GOLDSTON, Don, R. , HARTUP, David, Carl , MATHERNE, Marcus, M.
IPC分类号： H04H1/00 , H04L27/26 , H04L25/03
CPC分类号： H04H20/30 , H04L25/03159 , H04L2025/03414 , H04L2025/03522
摘要： A method is provided for equalizing an amplitude modulated compatible digital broadcasting signal which includes an amplitude modulated radio frequency signal having a first frequency spectrum, the amplitude modulated radio frequency signal having a first carrier modulated by an analog program signal, a plurality of digitally modulated carrier signals positioned within a bandwidth which encompasses the first frequency spectrum, a first group of the digitally modulated carrier signals including complementary signals and lying within the first frequency spectrum, and second and third groups of the digitally modulated carrier signals including non-complementary signals and lying outside of the first frequency spectrum. The method includes the steps of producing a first signal representative of in-phase components of the amplitude modulated compatible digital broadcasting signal; producing a second signal representative of quadrature-phase components of the amplitude modulated compatible digital broadcasting signal; using the first and second signals as the real and imaginary inputs to take the Fast Fourier Transform of the first and second signals to produce a plurality of transformed signals representative of frequency domain data; processing the tranformed signals by multiplying the transformed signals by an equalization vector, with the equalization vector comprising a plurality of equalizer coefficients; and updating the equalizer coefficients used for the complementary signals by interpolating coefficients of the vector for the non-complementary signals. The invention also encompasses the operation of radio frequency receivers which utilize the above method, as well as apparatus that performs the above method and radio frequency receivers which utilize the above equalization method.

7. 发明公开

EP1206857A2 METHOD AND APPARATUS FOR TRANSMISSION AND RECEPTION OF COMPRESSED AUDIO FRAMES WITH PRIORITIZED MESSAGES FOR DIGITAL AUDIO BROADCASTING 审中-公开
标题翻译：方法和设备用于数字音频广播优先级新闻传播和接收的压缩音频刚架
公开(公告)号：EP1206857A2
公开(公告)日：2002-05-22
申请号：EP00959335.1
申请日：2000-08-23
申请人： IBIQUITY DIGITAL CORPORATION
发明人： KROEGER, Brian, William , MATTSON, Stephen, Douglas
IPC分类号： H04H1/00
CPC分类号： H04H20/30 , H04H2201/20
摘要： 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 information within the estimated number of bits to produce encoded data; removing selected bits from the encoded data; adding bits corresponding to digital messages to the encoded information to form a composite modem frame; formatting the composite modem frame bits to produce formatted composite modem frame bits; and transmitting the formatted composite modem frame bits. The invention also encompasses transmitters that perform the method.

8. 发明公开

EP1125384A2 METHOD AND APPARATUS FOR REDUCTION OF FM INTERFERENCE FOR FM IN-BAND ON-CHANNEL DIGITAL AUDIO BROADCASTING SYSTEM 有权
标题翻译：方法和设备的干扰减少对于FM调频IN-BAND数字音频广播
公开(公告)号：EP1125384A2
公开(公告)日：2001-08-22
申请号：EP99965739.8
申请日：1999-10-28
申请人： IBIQUITY DIGITAL CORPORATION
发明人： KROEGER, Brian, William , BAIRD, Jeffrey, Scott
IPC分类号： H04H1/00 , H04B1/10
CPC分类号： H04B1/109 , H04H40/27 , H04H2201/183 , H04L25/03006
摘要： 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 a normalized composite signal. The composite signal is then multiplied by the complex conjugate of the normalized composite signal to produce a real signal. Then the real signal is filtered and the resulting filtered signal is multiplied by the normalized composite signal to produce an output signal. The adverse effects of the interfering signal in the output signal are reduced with respect to the magnitude of the signal of interest reducing FM interference in an in-band on-channel digital audio broadcasting system, thereby making it easier to detect the signal of interest. The output signal and the composite can be blended in response to the power of the real and filtered signals. Radio receivers that utilize the above method are also included.

9. 发明公开

EP1119928A1 METHOD FOR EQUALIZATION OF COMPLEMENTARY CARRIERS IN AN AM COMPATIBLE DIGITAL AUDIO BROADCAST SYSTEM 有权
标题翻译：方法在友好的数字广播系统的均衡互补货船
公开(公告)号：EP1119928A1
公开(公告)日：2001-08-01
申请号：EP99945484.6
申请日：1999-09-02
申请人： IBIQUITY DIGITAL CORPORATION
发明人： GOLDSTON, Don, R. , HARTUP, David, Carl , MATHERNE, Marcus, M.
IPC分类号： H04H1/00 , H04L27/26 , H04L25/03
CPC分类号： H04H20/30 , H04L25/03159 , H04L2025/03414 , H04L2025/03522
摘要： A method is provided for equalizing an amplitude modulated compatible digital broadcasting signal which includes an amplitude modulated radio frequency signal having a first frequency spectrum, the amplitude modulated radio frequency signal having a first carrier modulated by an analog program signal, a plurality of digitally modulated carrier signals positioned within a bandwidth which encompasses the first frequency spectrum, a first group of the digitally modulated carrier signals including complementary signals and lying within the first frequency spectrum, and second and third groups of the digitally modulated carrier signals including non-complementary signals and lying outside of the first frequency spectrum. The method includes the steps of producing a first signal representative of in-phase components of the amplitude modulated compatible digital broadcasting signal; producing a second signal representative of quadrature-phase components of the amplitude modulated compatible digital broadcasting signal; using the first and second signals as the real and imaginary inputs to take the Fast Fourier Transform of the first and second signals to produce a plurality of transformed signals representative of frequency domain data; processing the tranformed signals by multiplying the transformed signals by an equalization vector, with the equalization vector comprising a plurality of equalizer coefficients; and updating the equalizer coefficients used for the complementary signals by interpolating coefficients of the vector for the non-complementary signals. The invention also encompasses the operation of radio frequency receivers which utilize the above method, as well as apparatus that performs the above method and radio frequency receivers which utilize the above equalization method.

10. 发明公开

EP1101302A1 METHOD AND APPARATUS FOR AM DIGITAL BROADCASTING 审中-公开
标题翻译：方法和设备的数字或调幅收音机
公开(公告)号：EP1101302A1
公开(公告)日：2001-05-23
申请号：EP99908545.9
申请日：1999-02-24
申请人： IBIQUITY DIGITAL CORPORATION
发明人： KROEGER, Brian, William , WALDEN, E., Glynn , EBERL, George, Nicholas
IPC分类号： H04H1/00
CPC分类号： H04H20/30 , H04H2201/186
摘要： A method for AM in-band-on-channel (IBOC) digital audio broadcasting (DAB) uses a center channel signal in a central frequency band (18) 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 upper and lower sidebands (20, 22) of the AM radio channel are modulated with addition digitally encoded portions of the program material. The upper sideband (20) lies within a frequency band extending from about +5 kHz to about +10 kHz from a center frequency of the radio channel and the lower sideband (22) lying within a frequency band extending from about -5 kHz to about -10 kHz from the center frequency of the radio channel. The center channel signal and the upper and lower sideband sub-carriers are transmitted to receivers. In a hybrid IBOC DAB version, the center channel signal includes a carrier which is analog modulated by the first version of the program material and additional sub-carriers modulated by the second version of the program material, wherein the additional sub-carriers are transmitted at a power spectral density level that is less than the power spectral density of the analog modulated carrier. In an all-digital version, the center channel signal includes two groups of sub-carriers modulated with the program material.

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