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1. 发明授权

US08089377B2 Method and apparatus of performing sample rate conversion of a multi-channel audio signal 有权
标题翻译：执行多声道音频信号的采样率转换的方法和装置
公开(公告)号：US08089377B2
公开(公告)日：2012-01-03
申请号：US11835189
申请日：2007-08-07
申请人： David Chaohua Wu , Sheng Zhong
发明人： David Chaohua Wu , Sheng Zhong
IPC分类号： H03M7/00
CPC分类号： H04N5/607 , H04H20/48 , H04N5/602 , H04N21/8106
摘要： A method and apparatus are disclosed for performing sampling rate conversion of an audio signal from a first sampling rate to any of a plurality of higher sampling rates using a single set of low-pass filter coefficients. Sampling rate conversion is accomplished by effectively up-sampling, low-pass filtering, and down-sampling the audio signal to generate interpolated output samples of a second digital audio signal at any of a plurality of sampling rates. The sampling rate conversion process includes storing a fixed set of filter coefficients as a plurality of phased subsets of filter coefficients, applying samples of the audio signal to the phased subsets in a rotational manner to generate filtered samples of the audio signal, and selecting and linear interpolating between certain filtered samples to generate samples of the second digital audio signal.
摘要翻译：公开了一种用于使用单组低通滤波器系数将音频信号从第一采样率采样率转换到多个较高采样率中的任何一个的方法和装置。采样率转换通过有效地进行上采样，低通滤波和下采样音频信号来实现，以便以多个采样率中的任何一个产生第二数字音频信号的内插输出采样。采样率转换过程包括将固定的滤波器系数集合存储为滤波器系数的多个相位子集，以旋转方式将音频信号的采样应用于相位子集，以产生滤波后的音频信号样本，以及选择和线性在某些经滤波的样本之间内插以产生第二数字音频信号的采样。

2. 发明授权

US07253753B2 Method and apparatus of performing sample rate conversion of a multi-channel audio signal 失效
标题翻译：执行多声道音频信号的采样率转换的方法和装置
公开(公告)号：US07253753B2
公开(公告)日：2007-08-07
申请号：US10082950
申请日：2002-02-26
申请人： David Chaohua Wu , Sheng Zhong
发明人： David Chaohua Wu , Sheng Zhong
IPC分类号： H03M7/00 , H04H5/00
CPC分类号： H04N5/607 , H04H20/48 , H04N5/602 , H04N21/8106
摘要： A method and apparatus are disclosed for performing sampling rate conversion of an audio signal from a first sampling rate to any of a plurality of higher sampling rates using a single set of low-pass filter coefficients. Sampling rate conversion is accomplished by effectively up-sampling, low-pass filtering, and down-sampling the audio signal to generate interpolated output samples of a second digital audio signal at any of a plurality of sampling rates. The sampling rate conversion process includes storing a fixed set of filter coefficients as a plurality of phased subsets of filter coefficients, applying samples of the audio signal to the phased subsets in a rotational manner to generate filtered samples of the audio signal, and selecting and linear interpolating between certain filtered samples to generate samples of the second digital audio signal.
摘要翻译：公开了一种用于使用单组低通滤波器系数将音频信号从第一采样率采样率转换到多个较高采样率中的任何一个的方法和装置。采样率转换通过有效地进行上采样，低通滤波和下采样音频信号来实现，以便以多个采样率中的任何一个产生第二数字音频信号的内插输出采样。采样率转换过程包括将固定的滤波器系数集合存储为滤波器系数的多个相位子集，以旋转方式将音频信号的采样应用于相位子集，以产生滤波后的音频信号样本，以及选择和线性在某些经滤波的样本之间内插以产生第二数字音频信号的采样。

3. 发明授权

US06859238B2 Scaling adjustment to enhance stereo separation 失效
标题翻译：缩放调整以增强立体声分离
公开(公告)号：US06859238B2
公开(公告)日：2005-02-22
申请号：US10083203
申请日：2002-02-26
申请人： David Chaohua Wu
发明人： David Chaohua Wu
IPC分类号： H04H1/00 , H04H20/48 , H04N5/60 , H04N7/08
CPC分类号： H04N5/602 , H04H20/48 , H04N5/607 , H04N21/8106 , H04N21/85406
摘要： A demodulator (10) converts television signals to video baseband signals and audio baseband signals including stereo signals representing a right channel signal value and a left channel signal value. A DSP (60) recursively finds a preferred coefficient value for a scaling that reduces stereo separation due to amplitude variation of the right and left channel signal values. The preferred coefficient value is thereafter used for scaling the right and left channel signal values.
摘要翻译：解调器（10）将电视信号转换为视频基带信号和包括表示右声道信号值和左声道信号值的立体声信号的音频基带信号。 DSP（60）递归地找到由于右和左声道信号值的幅度变化而减小立体声分离的缩放的优选系数值。此后优选的系数值用于缩放左右声道信号值。

4. 发明申请

US20110211658A1 SYSTEM AND METHOD OF PERFORMING DIGITAL MULTI-CHANNEL AUDIO SIGNAL DECODING 审中-公开
标题翻译：数字多通道音频信号解码的系统和方法
公开(公告)号：US20110211658A1
公开(公告)日：2011-09-01
申请号：US13069090
申请日：2011-03-22
申请人： David Chaohua Wu , Hoang Nhu , Russ Lambert , Alexander G. MacInnis , Ronald Crochiere
发明人： David Chaohua Wu , Hoang Nhu , Russ Lambert , Alexander G. MacInnis , Ronald Crochiere
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。

5. 发明授权

US07912153B2 System and method of performing digital multi-channel audio signal decoding 有权
标题翻译：执行数字多声道音频信号解码的系统和方法
公开(公告)号：US07912153B2
公开(公告)日：2011-03-22
申请号：US11426836
申请日：2006-06-27
申请人： David Chaohua Wu , Hoang Nhu , Russ Lambert , Alexander G. MacInnis , Ronald Crochiere
发明人： David Chaohua Wu , Hoang Nhu , Russ Lambert , Alexander G. MacInnis , Ronald Crochiere
IPC分类号： H04L27/06 , H04B1/10
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。

6. 发明授权

US07515889B2 Scaling adjustment using pilot signal 有权
标题翻译：使用导频信号进行缩放调整
公开(公告)号：US07515889B2
公开(公告)日：2009-04-07
申请号：US11011567
申请日：2004-12-14
申请人： David Chaohua Wu
发明人： David Chaohua Wu
IPC分类号： H04B7/00 , H04B17/00 , H04N5/60 , H04H20/47 , H04H40/54
CPC分类号： H04N5/607 , H04H20/48 , H04N5/602 , H04N21/8106 , H04N21/85406
摘要： A demodulator (10) converts television signals to video baseband signals and audio baseband signals including stereo signals representing a right channel signal value, a left channel signal value and a pilot signal having an amplitude. A DSP (60) recursively finds a coefficient value for scaling that keeps the pilot signal amplitude within a range of values, there by improving baseband signal quality, such as stereo separation of stereo signals within the baseband signals.
摘要翻译：解调器（10）将电视信号转换为视频基带信号和音频基带信号，包括表示右声道信号值，左声道信号值和具有振幅的导频信号的立体声信号。 DSP（60）递归地找到用于缩放的系数值，其通过改善基带信号质量（例如基带信号内的立体声信号的立体声分离）来将导频信号幅度保持在值的范围内。

7. 发明授权

US07079657B2 System and method of performing digital multi-channel audio signal decoding 失效
标题翻译：执行数字多声道音频信号解码的系统和方法
公开(公告)号：US07079657B2
公开(公告)日：2006-07-18
申请号：US10083052
申请日：2002-02-26
申请人： David Chaohua Wu , Hoang Nhu , Russ Lambert , Alexander G. MacInnis , Ronald Crochiere
发明人： David Chaohua Wu , Hoang Nhu , Russ Lambert , Alexander G. MacInnis , Ronald Crochiere
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。

8. 发明授权

US07006806B2 System and method for SAP FM demodulation 失效
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.

9. 发明授权

US06832078B2 Scaling adjustment using pilot signal 有权
标题翻译：使用导频信号进行缩放调整
公开(公告)号：US06832078B2
公开(公告)日：2004-12-14
申请号：US10083201
申请日：2002-02-26
申请人： David Chaohua Wu
发明人： David Chaohua Wu
IPC分类号： H04B700
CPC分类号： H04N5/607 , H04H20/48 , H04N5/602 , H04N21/8106 , H04N21/85406
摘要： A demodulator (10) converts television signals to video baseband signals and audio baseband signals including stereo signals representing a right channel signal value, a left channel signal value and a pilot signal having an amplitude. A DSP (60) recursively finds a coefficient value for scaling that keeps the pilot signal amplitude within a range of values, there by improving baseband signal quality, such as stereo separation of stereo signals within the baseband signals.
摘要翻译：解调器（10）将电视信号转换为视频基带信号和音频基带信号，包括表示右声道信号值，左声道信号值和具有振幅的导频信号的立体声信号。 DSP（60）递归地找到用于缩放的系数值，其通过改善基带信号质量（例如基带信号内的立体声信号的立体声分离）来将导频信号幅度保持在值的范围内。

10. 发明授权

US08050412B2 Scaling adjustment to enhance stereo separation 有权
标题翻译：缩放调整以增强立体声分离
公开(公告)号：US08050412B2
公开(公告)日：2011-11-01
申请号：US11011565
申请日：2004-12-14
申请人： David Chaohua Wu
发明人： David Chaohua Wu
IPC分类号： H04H20/47 , H04H20/48 , H04H20/49 , H03G7/00
CPC分类号： H04N5/607 , H04H20/48 , H04N5/602 , H04N21/8106 , H04N21/85406
摘要： A demodulator (10) converts television signals to video baseband signals and audio baseband signals including stereo signals representing a right channel signal value and a left channel signal value. A DSP (60) recursively finds a preferred coefficient value for a scaling that reduces stereo separation due to amplitude variation of the right and left channel signal values. The preferred coefficient value is thereafter used for scaling the right and left channel signal values.
摘要翻译：解调器（10）将电视信号转换为视频基带信号和包括表示右声道信号值和左声道信号值的立体声信号的音频基带信号。 DSP（60）递归地找到由于右和左声道信号值的幅度变化而减小立体声分离的缩放的优选系数值。此后优选的系数值用于缩放左右声道信号值。

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