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公开(公告)号：US07650125B2
公开(公告)日：2010-01-19
申请号：US11286561
申请日：2005-11-23
申请人： David Chaohua Wu , Russ Lambert
发明人： David Chaohua Wu , Russ Lambert
IPC分类号： H04B1/16
CPC分类号： H04N5/602 , H04H20/48 , H04N5/607 , H04N21/8106
摘要： Certain embodiments of the present invention provides a system and method for SAP FM demodulation. The system includes a bandpass filter for isolating the SAP signal, a Hilbert filter to produce a copy of the SAP signal phase shifted by 90 degrees, an FM demodulator for demodulating the SAP signal using the phase shifted SAP signal and a delayed SAP signal, and a lowpass filter to eliminate noise from the FM demodulated SAP signal. The system may also include an automatic gain control for normalizing amplitude of FM demodulator input signals. The digital FM demodulator uses a simplified approximation using non-unity delay for simplified demodulation of frequency modulated signals.
摘要翻译： 本发明的某些实施例提供了一种用于SAP FM解调的系统和方法。 该系统包括用于隔离SAP信号的带通滤波器，希尔伯特滤波器以产生偏移90度的SAP信号相位的副本，用于使用相移的SAP信号和延迟的SAP信号来解调SAP信号的FM解调器，以及 低通滤波器，以消除FM解调的SAP信号中的噪声。 该系统还可以包括用于使FM解调器输入信号的幅度归一化的自动增益控制。 数字FM解调器使用非均匀延迟的简化近似来简化频率调制信号的解调。
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2.发明申请公开(公告)号：US20060232868A1
公开(公告)日：2006-10-19
申请号：US11426836
申请日：2006-06-27
申请人： David Wu , Hoang Nhu , Russ Lambert , Alexander MacInnis , Ronald Crochiere
发明人： David Wu , Hoang Nhu , Russ Lambert , Alexander MacInnis , Ronald Crochiere
IPC分类号： G11B25/04
CPC分类号： H04N7/06 , H04H20/48 , H04N5/602 , H04N5/607 , H04N21/8106 , H04N21/85406 , H04R5/04
摘要： A system and method are disclosed for performing digital multi-channel decoding of a BTSC composite audio signal. Each subsequent stage of the digital multi-channel decoding process is performed at the lowest sampling rate that yields acceptable performance for that stage. Analog-to-digital conversion of the composite audio signal is performed first to generate a composite digital audio signal. After analog-to-digital conversion, all signal processing may be performed in the digital domain. The composite digital audio signal is digitally filtered to frequency compensate for variations caused by previous stages of processing, including IF demodulation. Digital channel demodulation and filtering are performed to isolate single channels of the composite digital audio signal such as SAP, L−R, and L+R channels. SAP and L−R channels are DBX decoded resulting in corresponding decoded signals using a unique combination of digital filters that are an efficient translation of a corresponding combination of analog filters. The decoded L−R channel and the L+R channel are re-matrixed to form left and right stereo signals. Any of the SAP signal, left and right stereo signals, and L+R channel signal may be sample rate converted and output at a standard audio output rate.
摘要翻译： 公开了一种用于对BTSC复合音频信号执行数字多声道解码的系统和方法。 数字多通道解码过程的每个后续阶段以最低的采样率执行，该阶段产生可接受的性能。 首先执行复合音频信号的模数转换以产生复合数字音频信号。 在模数转换之后，可以在数字域中执行所有的信号处理。 复合数字音频信号被数字滤波，以对由先前的处理阶段（包括IF解调）引起的变化进行频率补偿。 执行数字信道解调和滤波以隔离诸如SAP，L-R和L + R信道的复合数字音频信号的单个信道。 SAP和L-R通道被DBX解码，从而产生相应的解码信号，其使用数字滤波器的独特组合，其是模拟滤波器的相应组合的有效转换。 解码的L-R信道和L + R信道被重新矩阵化以形成左和右立体声信号。 SAP信号，左立体声信号和右立体声信号以及L + R信道信号中的任何一个可以采样率转换并以标准音频输出速率输出。
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3.发明申请公开(公告)号：US20110211658A1
公开(公告)日：2011-09-01
申请号：US13069090
申请日：2011-03-22
IPC分类号： H04L27/06
CPC分类号： H04N7/06 , H04H20/48 , H04N5/602 , H04N5/607 , H04N21/8106 , H04N21/85406 , H04R5/04
摘要： A system and method are disclosed for performing digital multi-channel decoding of a BTSC composite audio signal. Each subsequent stage of the digital multi-channel decoding process is performed at the lowest sampling rate that yields acceptable performance for that stage. Analog-to-digital conversion of the composite audio signal is performed first to generate a composite digital audio signal. After analog-to-digital conversion, all signal processing may be performed in the digital domain. The composite digital audio signal is digitally filtered to frequency compensate for variations caused by previous stages of processing, including IF demodulation. Digital channel demodulation and filtering are performed to isolate single channels of the composite digital audio signal such as SAP, L−R, and L+R channels. SAP and L−R channels are DBX decoded resulting in corresponding decoded signals using a unique combination of digital filters that are an efficient translation of a corresponding combination of analog filters. The decoded L−R channel and the L+R channel are re-matrixed to form left and right stereo signals. Any of the SAP signal, left and right stereo signals, and L+R channel signal may be sample rate converted and output at a standard audio output rate.
摘要翻译： 公开了一种用于对BTSC复合音频信号执行数字多声道解码的系统和方法。 数字多通道解码过程的每个后续阶段以最低的采样率执行，该阶段产生可接受的性能。 首先执行复合音频信号的模数转换以产生复合数字音频信号。 在模数转换之后，可以在数字域中执行所有的信号处理。 复合数字音频信号被数字滤波，以对由先前的处理阶段（包括IF解调）引起的变化进行频率补偿。 执行数字信道解调和滤波以隔离诸如SAP，L-R和L + R信道的复合数字音频信号的单个信道。 SAP和L-R通道被DBX解码，从而产生相应的解码信号，其使用数字滤波器的独特组合，其是模拟滤波器的相应组合的有效转换。 解码的L-R信道和L + R信道被重新矩阵化以形成左和右立体声信号。 SAP信号，左立体声信号和右立体声信号以及L + R信道信号中的任何一个可以采样率转换并以标准音频输出速率输出。
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4.发明授权公开(公告)号：US07912153B2
公开(公告)日：2011-03-22
申请号：US11426836
申请日：2006-06-27
CPC分类号： H04N7/06 , H04H20/48 , H04N5/602 , H04N5/607 , H04N21/8106 , H04N21/85406 , H04R5/04
摘要： A system and method are disclosed for performing digital multi-channel decoding of a BTSC composite audio signal. Each subsequent stage of the digital multi-channel decoding process is performed at the lowest sampling rate that yields acceptable performance for that stage. Analog-to-digital conversion of the composite audio signal is performed first to generate a composite digital audio signal. After analog-to-digital conversion, all signal processing may be performed in the digital domain. The composite digital audio signal is digitally filtered to frequency compensate for variations caused by previous stages of processing, including IF demodulation. Digital channel demodulation and filtering are performed to isolate single channels of the composite digital audio signal such as SAP, L−R, and L+R channels. SAP and L−R channels are DBX decoded resulting in corresponding decoded signals using a unique combination of digital filters that are an efficient translation of a corresponding combination of analog filters.
摘要翻译： 公开了一种用于对BTSC复合音频信号执行数字多声道解码的系统和方法。 数字多通道解码过程的每个后续阶段以最低的采样率执行，该阶段产生可接受的性能。 首先执行复合音频信号的模数转换以产生复合数字音频信号。 在模数转换之后，可以在数字域中执行所有的信号处理。 复合数字音频信号被数字滤波，以对由先前的处理阶段（包括IF解调）引起的变化进行频率补偿。 执行数字信道解调和滤波以隔离诸如SAP，L-R和L + R信道的复合数字音频信号的单个信道。 SAP和L-R通道被DBX解码，从而产生相应的解码信号，其使用数字滤波器的独特组合，其是模拟滤波器的相应组合的有效转换。
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5.发明授权公开(公告)号：US07079657B2
公开(公告)日：2006-07-18
申请号：US10083052
申请日：2002-02-26
IPC分类号： H04H5/00
CPC分类号： H04N7/06 , H04H20/48 , H04N5/602 , H04N5/607 , H04N21/8106 , H04N21/85406 , H04R5/04
摘要： A system and method are disclosed for performing digital multi-channel decoding of a BTSC composite audio signal. Analog-to-digital conversion is performed on a composite analog audio signal at a fast clock rate to generate a composite digital audio signal at a first sample rate. Digital frequency compensation is performed on the composite digital audio signal at the first sample rate to generate a compensated composite audio signal. Digital channel demodulation and filtering are performed on the compensated composite audio signal at the first sample rate to generate a first single channel audio signal at a second sample rate.
摘要翻译： 公开了一种用于对BTSC复合音频信号执行数字多声道解码的系统和方法。 以复合模拟音频信号以快速时钟速率执行模数转换，以产生第一采样率的复合数字音频信号。 以第一采样率对复合数字音频信号进行数字频率补偿，以生成补偿的复合音频信号。 以第一采样率对补偿的复合音频信号进行数字信道解调和滤波，以产生第二采样率的第一单声道音频信号。
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公开(公告)号：US20060079197A1
公开(公告)日：2006-04-13
申请号：US11286561
申请日：2005-11-23
申请人： David Wu , Russ Lambert
发明人： David Wu , Russ Lambert
CPC分类号： H04N5/602 , H04H20/48 , H04N5/607 , H04N21/8106
摘要： Certain embodiments of the present invention provides a system and method for SAP FM demodulation. The system includes a bandpass filter for isolating the SAP signal, a Hilbert filter to produce a copy of the SAP signal phase shifted by 90 degrees, an FM demodulator for demodulating the SAP signal using the phase shifted SAP signal and a delayed SAP signal, and a lowpass filter to eliminate noise from the FM demodulated SAP signal. The system may also include an automatic gain control for normalizing amplitude of FM demodulator input signals. The digital FM demodulator uses a simplified approximation using non-unity delay for simplified demodulation of frequency modulated signals.
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公开(公告)号：US07006806B2
公开(公告)日：2006-02-28
申请号：US10083076
申请日：2002-02-26
申请人： David Chaohua Wu , Russ Lambert
发明人： David Chaohua Wu , Russ Lambert
IPC分类号： H04B1/16
CPC分类号： H04N5/602 , H04H20/48 , H04N5/607 , H04N21/8106
摘要： Certain embodiments of the present invention provides a system and method for SAP FM demodulation. The system includes a bandpass filter for isolating the SAP signal, a Hilbert filter to produce a copy of the SAP signal phase shifted by 90 degrees, an FM demodulator for demodulating the SAP signal using the phase shifted SAP signal and a delayed SAP signal, and a lowpass filter to eliminate noise from the FM demodulated SAP signal. The system may also include an automatic gain control for normalizing amplitude of FM demodulator input signals. The digital FM demodulator uses a simplified approximation using non-unity delay for simplified demodulation of frequency modulated signals.
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