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1. 发明授权

US06671667B1 Speech presence measurement detection techniques 有权
标题翻译：语音存在测量检测技术
公开(公告)号：US06671667B1
公开(公告)日：2003-12-30
申请号：US09536583
申请日：2000-03-28
申请人： Ravi Chandran , Bruce E. Dunne , Daniel J. Marchok
发明人： Ravi Chandran , Bruce E. Dunne , Daniel J. Marchok
IPC分类号： G10L1902
CPC分类号： G10L25/78 , G10L21/0208 , G10L21/0232 , G10L21/0264 , G10L2025/783
摘要： In order to enhance the quality of a communication signal derived from speech and noise, the likelihood that the communication signals result from at least some speech is determined. A calculator calculates a first power signal representing the power of at least a portion of the communication signals estimated over a first time period and calculates a second power signal representing the power of at least a portion of the communication signals estimated over a second time period longer than the first time period. The calculator also generates a comparison signal having a value related to the likelihood that the portion of the communication signals result from at least some speech by comparing a first expression involving the first power signal with a second expression involving the second power signal. The calculator also generates a speech likelihood signal having a value representing a first likelihood that the communication signal results from at least some speech in the event that the comparison signal value falls within a first range and having a second value representing a second likelihood that the communication signal results from at least some speech in the event that the comparison signal value falls within a second range. The second likelihood is different from the first likelihood.
摘要翻译：为了提高从语音和噪声导出的通信信号的质量，确定了至少一些语音产生通信信号的可能性。计算器计算表示在第一时间周期估计的通信信号的至少一部分的功率的第一功率信号，并且计算表示在第二时间段内估计的至少一部分通信信号的功率的第二功率信号比第一个时期。计算器还生成比较信号，其具有与通过将包含第一功率信号的第一表达与涉及第二功率信号的第二表达进行比较，从至少一些语音产生通信信号的部分的可能性的值。计算器还产生语音似然信号，该语音似然信号具有表示在比较信号值落在第一范围内并且具有表示第二可能性的第二值的通信信号从至少一些语音产生的第一可能性的值，在比较信号值落在第二范围的情况下，来自至少一些语音的信号。第二种可能性与第一种可能性不同。

2. 发明授权

US07424424B2 Communication system noise cancellation power signal calculation techniques 有权
标题翻译：通信系统噪声消除功率信号计算技术
公开(公告)号：US07424424B2
公开(公告)日：2008-09-09
申请号：US11476309
申请日：2006-06-28
申请人： Ravi Chandran , Bruce E. Dunne , Daniel J. Marchok
发明人： Ravi Chandran , Bruce E. Dunne , Daniel J. Marchok
IPC分类号： G10L21/02
CPC分类号： G10L21/0208 , G10L19/0204 , G10L21/02 , G10L21/0232
摘要： In order to enhance the quality of a communication signal derived from speech and noise, a filter divides the communication signal into a plurality of frequency band signals. A calculator generates a plurality of power band signals each having a power band value and corresponding to one of the frequency band signals. The power band values are based on estimating, over a time period, the power of one of the frequency band signals. The time period is different for different ones of the frequency band signals. The power band values are used to calculate weighting factors which are used to alter the frequency band signals that are combined to generate an improved communication signal.
摘要翻译：为了提高从语音和噪声导出的通信信号的质量，滤波器将通信信号分成多个频带信号。计算器产生多个功率带信号，每个功率带信号具有功率带值并对应于一个频带信号。功率带值基于在一段时间内估计一个频带信号的功率。对于不同的频带信号，时间周期是不同的。功率带值用于计算用于改变被组合以产生改进的通信信号的频带信号的加权因子。

3. 发明授权

US06591234B1 Method and apparatus for adaptively suppressing noise 有权
标题翻译：自适应抑制噪声的方法和装置
公开(公告)号：US06591234B1
公开(公告)日：2003-07-08
申请号：US09479120
申请日：2000-01-07
申请人： Ravi Chandran , Daniel J. Marchok , Bruce E. Dunne
发明人： Ravi Chandran , Daniel J. Marchok , Bruce E. Dunne
IPC分类号： G10L2102
CPC分类号： G10L21/0208 , G10L21/0232 , G10L25/18
摘要： A processor (300) is arranged to divide a communication signal into a plurality of frequency band signals including speech and noise components due to speech and noise. The processor generates first and second power signals for the frequency band signals. Each first power signal is based on estimating over a first time period the power of one of the frequency band signals. Each second power signal is based on estimating over a second time period less than the first time period the power of one of the frequency band signals. The processor generates condition signals representing conditions of the frequency band signals, and adjusts the gain of the frequency band signals in response to the condition signals to generate adjusted frequency band signals. The processor then combines the adjusted frequency band signals to generate an adjusted communication signal.
摘要翻译：处理器（300）被布置为由于语音和噪声将通信信号划分成包括语音和噪声分量的多个频带信号。处理器产生用于频带信号的第一和第二功率信号。每个第一功率信号基于在第一时间段内估计一个频带信号的功率。每个第二功率信号基于在第一时间周期内估计超过一个频带信号的功率的第二时间段。处理器产生表示频带信号的条件的条件信号，并且响应于条件信号调整频带信号的增益以产生经调整的频带信号。然后处理器组合经调整的频带信号以产生经调整的通信信号。

4. 发明授权

US6031908A Echo canceller employing dual-H architecture having variable adaptive gain settings 失效
标题翻译：采用具有可变自适应增益设置的双H架构的回波消除器
公开(公告)号：US6031908A
公开(公告)日：2000-02-29
申请号：US970874
申请日：1997-11-14
申请人： Kenneth P. Laberteaux , Richard C. Younce , Bruce E. Dunne , David S. Farrell
发明人： Kenneth P. Laberteaux , Richard C. Younce , Bruce E. Dunne , David S. Farrell
IPC分类号： H04M1/58 , H04B3/23 , H04M9/08 , H04M1/00
CPC分类号： H04M9/082 , H04B3/23
摘要： An echo canceller circuit for use in an echo canceller system is set forth that provides sensitive double-talk detection. The echo canceller circuit comprises a second digital filter having adaptive tap coefficients to simulate an echo response occurring during the call. The adaptive tap coefficients of the second digital filter are updated over the duration of the call using a Least Mean Squares process having an adaptive gain a. A channel condition detector is used to detect channel conditions during the call. The channel condition detector is responsive to detected channel conditions for changing the adaptive gain a during the call. For example, the channel condition detector may detect the presence of a double-talk condition and set the adaptive gain a to zero. Similarly, the channel condition detector may detect the occurrence of a high background noise condition and set the adaptive gain a to a level less than 1 that is dependent on the detected level of the background noise. Other similar channel conditions and corresponding adaptive gain settings may likewise be utilized.
摘要翻译：提出了一种用于回波消除器系统中的回波消除电路，其提供灵敏的双向通话检测。回波消除器电路包括具有自适应抽头系数的第二数字滤波器来模拟在呼叫期间发生的回波响应。使用具有自适应增益a的最小均方方法，在呼叫的持续时间内更新第二数字滤波器的自适应抽头系数。信道条件检测器用于检测呼叫期间的信道状况。信道条件检测器响应于检测到的信道条件，用于在呼叫期间改变自适应增益a。例如，信道条件检测器可以检测双方通话状况的存在并将自适应增益a设置为零。类似地，信道条件检测器可以检测高背景噪声条件的发生，并将自适应增益a设置为取决于检测到的背景噪声电平的小于1的电平。同样可以利用其他类似的信道条件和相应的自适应增益设置。

5. 发明授权

US07366294B2 Communication system tonal component maintenance techniques 有权
标题翻译：通信系统音调组件维护技术
公开(公告)号：US07366294B2
公开(公告)日：2008-04-29
申请号：US11046161
申请日：2005-01-28
申请人： Ravi Chandran , Daniel J. Marchok , Bruce E. Dunne
发明人： Ravi Chandran , Daniel J. Marchok , Bruce E. Dunne
IPC分类号： H04M1/00 , H04M3/00 , H04M7/00
CPC分类号： G10L21/0208 , G10L21/0232 , G10L25/18
摘要： An apparatus and method for suppressing noise is presented. The apparatus may utilize a filter bank of bandpass filters to split the input noisy speech-containing signal into separate frequency bands. To determine whether the input signal contains speech, DTMF tones or silence, a joint voice activity & DTMF activity detector (JVADAD) may be used. The overall average noise-to-signal ratio (NSR) of the input signal is estimated in the overall NSR estimator, which estimates the average noisy signal power in the input signal during speech activity and the average noise power during silence. Two indirect power measures are performed for each band, measuring a short-term power and a long-term power. The power estimation processes are adapted based on the signal activity indicated by the JVADAD. A NSR adapter adapts the NSR for each frequency band based on the long-term and short-term power measures, the overall NSR and the signal activity indicated by the JVADAD. The NSR adaptation may then be performed. The gain computer utilizes these NSR values to determine the gain factors for each frequency band. The gain multiplier may then perform the attenuation of each frequency band. Finally, the processed signals in the separate frequency bands are summed up in the combiner to produce the clean output signal. In another embodiment of the present invention, a method for suppressing noise is presented. An alternative embodiment of the present invention includes a method and apparatus for extending DTMF tones. Yet another embodiment of the present invention includes regenerating DTMF tones.
摘要翻译：提出了一种抑制噪声的装置和方法。该装置可以利用滤波器组的带通滤波器将输入的含噪声语音的信号分离成单独的频带。为了确定输入信号是否包含语音，DTMF音或静音，可以使用联合语音活动和DTMF活动检测器（JVADAD）。在整个NSR估计器中估计输入信号的总体平均噪声信噪比（NSR），NSR估计器估计语音活动期间输入信号中的平均噪声信号功率和静音期间的平均噪声功率。对每个频带执行两个间接功率测量，测量短期功率和长期功率。功率估计过程基于JVADAD指示的信号活动进行调整。 NSR适配器根据长期和短期功率测量，整个NSR和JVADAD指示的信号活动，为每个频段调整NSR。然后可以执行NSR适配。增益计算机利用这些NSR值来确定每个频带的增益因子。然后，增益乘法器可以执行每个频带的衰减。最后，在组合器中将分离的频带中的经处理的信号相加，以产生干净的输出信号。在本发明的另一实施例中，提出了一种抑制噪声的方法。本发明的替代实施例包括用于扩展DTMF音调的方法和装置。本发明的另一个实施例包括再生DTMF音调。

6. 发明授权

US07200222B2 Echo canceller employing dual-H architecture having variable adaptive gain settings 有权
标题翻译：采用具有可变自适应增益设置的双H架构的回波消除器
公开(公告)号：US07200222B2
公开(公告)日：2007-04-03
申请号：US10602949
申请日：2003-06-23
申请人： Kenneth P. Laberteaux , Richard C. Younce , Bruce E. Dunne , David S. Farrell
发明人： Kenneth P. Laberteaux , Richard C. Younce , Bruce E. Dunne , David S. Farrell
IPC分类号： H04M1/00
CPC分类号： H04M9/082 , H04B3/23
摘要： An echo canceller circuit for use in an echo canceller system is set forth that provides sensitive double-talk detection. The echo canceller circuit comprises a second digital filter having adaptive tap coefficients to simulate an echo response occurring during the call. The adaptive tap coefficients of the second digital filter are updated over the duration of the call using a Least Mean Squares process having an adaptive gain a. A channel condition detector is used to detect channel conditions during the call. The channel condition detector is responsive to detected channel conditions for changing the adaptive gain a during the call. For example, the channel condition detector may detect the presence of a double-talk condition and set the adaptive gain a to zero. Similarly, the channel condition detector may detect the occurrence of a high background noise condition and set the adaptive gain a to a level less than 1 that is dependent on the detected level of the background noise. Other similar channel conditions and corresponding adaptive gain settings may likewise be utilized.
摘要翻译：提出了一种用于回波消除器系统中的回波消除电路，其提供灵敏的双向通话检测。回波消除器电路包括具有自适应抽头系数的第二数字滤波器来模拟在呼叫期间发生的回波响应。使用具有自适应增益a的最小均方方法，在呼叫的持续时间内更新第二数字滤波器的自适应抽头系数。信道条件检测器用于检测呼叫期间的信道状况。信道条件检测器响应于检测到的信道条件，用于在呼叫期间改变自适应增益a。例如，信道条件检测器可以检测双方通话状况的存在并将自适应增益a设置为零。类似地，信道条件检测器可以检测高背景噪声条件的发生，并将自适应增益a设置为取决于检测到的背景噪声电平的小于1的电平。同样可以利用其他类似的信道条件和相应的自适应增益设置。

7. 发明授权

US07158572B2 Audio enhancement communication techniques 有权
公开(公告)号：US07158572B2
公开(公告)日：2007-01-02
申请号：US10075145
申请日：2002-02-14
申请人： Bruce E. Dunne , Ravi Chandran , Daniel J. Marchok
发明人： Bruce E. Dunne , Ravi Chandran , Daniel J. Marchok
IPC分类号： H04B1/66
CPC分类号： G10L19/18 , G10L21/0364 , H04B1/66
摘要： A communication system (10) receives a communication signal comprising first and second data with different compression levels, such as highly compressed and weakly compressed levels. A mode detector (15) detects the level of compression. One or more signal decoders (20, 22) decode the highly compressed data. An analyzer (30) determines the type of enhancement required. One or more processors (48, 50, 80) enhance the data as required. An encoder (60) reencodes the enhanced decoded data. Metrics (90) may aid the operation of the analyzer (30).The communication system may include telephones (120, 122, 124, 126). Processors (103, 104) enhance signals in opposite first and second directions between pairs of the telephones. A path (106) connects the processors in tandem. One or more switches (101, 102) disable signal enhancement for one of the processors depending on the compression level of the signals to avoid degrading call quality.

8. 发明授权

US07096182B2 Communication system noise cancellation power signal calculation techniques 有权
公开(公告)号：US07096182B2
公开(公告)日：2006-08-22
申请号：US10376849
申请日：2003-02-28
申请人： Ravi Chandran , Bruce E. Dunne , Daniel J. Marchok
发明人： Ravi Chandran , Bruce E. Dunne , Daniel J. Marchok
IPC分类号： G10L21/02
CPC分类号： G10L21/0208 , G10L19/0204 , G10L21/02 , G10L21/0232
摘要： In order to enhance the quality of a communication signal derived from speech and noise, a filter divides the communication signal into a plurality of frequency band signals. A calculator generates a plurality of power band signals each having a power band value and corresponding to one of the frequency band signals. The power band values are based on estimating, over a time period, the power of one of the frequency band signals. The time period is different for different ones of the frequency band signals. The power band values are used to calculate weighting factors which are used to alter the frequency band signals that are combined to generate an improved communication signal.

9. 发明授权

US06766292B1 Relative noise ratio weighting techniques for adaptive noise cancellation 有权
标题翻译：用于自适应噪声消除的相对噪声比加权技术
公开(公告)号：US06766292B1
公开(公告)日：2004-07-20
申请号：US09535844
申请日：2000-03-28
申请人： Ravi Chandran , Bruce E. Dunne , Daniel J. Marchok
发明人： Ravi Chandran , Bruce E. Dunne , Daniel J. Marchok
IPC分类号： G10L2102
CPC分类号： G10L21/0208
摘要： In order to enhance the quality of a communication signal comprising speech signal components due to speech and noise signal components due to noise, a filter divides the communication signal into a plurality of frequency band signals representing the speech signal components and the noise signal components in a plurality of frequency bands. A calculator generates a plurality of weighting signals having weighting values corresponding to the frequency band signals. The weighting values represent at least approximations of the normalized powers of the noise signal components in the frequency band signals. The frequency band signals are altered in response to the weighting signals to generate weighted frequency band signals which are combined to generate a communication signal with enhanced quality.
摘要翻译：为了提高包含由噪声引起的语音和噪声信号分量的语音信号分量的通信信号的质量，滤波器将通信信号分成多个频带信号，该信号表示语音信号分量和噪声信号分量多个频带。计算器产生具有对应于频带信号的加权值的多个加权信号。加权值表示频带信号中的噪声信号分量的归一化功率的近似值。响应于加权信号改变频带信号以产生加权的频带信号，其被组合以产生具有增强质量的通信信号。

10. 发明授权

US08031861B2 Communication system tonal component maintenance techniques 有权
标题翻译：通信系统音调组件维护技术
公开(公告)号：US08031861B2
公开(公告)日：2011-10-04
申请号：US12072500
申请日：2008-02-26
申请人： Ravi Chandran , Daniel J. Marchok , Bruce E. Dunne
发明人： Ravi Chandran , Daniel J. Marchok , Bruce E. Dunne
IPC分类号： H04M7/00 , H04M1/00 , H04M5/00
CPC分类号： G10L21/0208 , G10L21/0232 , G10L25/18
摘要： An apparatus and method for suppressing noise is presented. The apparatus may utilize a filter bank of bandpass filters to split the input noisy speech-containing signal into separate frequency bands. To determine whether the input signal contains speech, DTMF tones or silence, a joint voice activity & DTMF activity detector (JVADAD) may be used. The overall average noise-to-signal ratio (NSR) of the input signal is estimated in the overall NSR estimator, which estimates the average noisy signal power in the input signal during speech activity and the average noise power during silence. Two indirect power measures are performed for each band, measuring a short-term power and a long-term power. The power estimation processes are adapted based on the signal activity indicated by the JVADAD. A NSR adapter adapts the NSR for each frequency band based on the long-term and short-term power measures, the overall NSR and the signal activity indicated by the JVADAD. The NSR adaptation may then be performed. The gain computer utilizes these NSR values to determine the gain factors for each frequency band. The gain multiplier may then perform the attenuation of each frequency band. Finally, the processed signals in the separate frequency bands are summed up in the combiner to produce the clean output signal. In another embodiment of the present invention, a method for suppressing noise is presented. An alternative embodiment of the present invention includes a method and apparatus for extending DTMF tones. Yet another embodiment of the present invention includes regenerating DTMF tones.
摘要翻译：提出了一种抑制噪声的装置和方法。该装置可以利用滤波器组的带通滤波器将输入的含噪声语音的信号分离成单独的频带。为了确定输入信号是否包含语音，DTMF音或静音，可以使用联合语音活动和DTMF活动检测器（JVADAD）。在整个NSR估计器中估计输入信号的总体平均噪声信噪比（NSR），NSR估计器估计语音活动期间输入信号中的平均噪声信号功率和静音期间的平均噪声功率。对每个频带执行两个间接功率测量，测量短期功率和长期功率。功率估计过程基于JVADAD指示的信号活动进行调整。 NSR适配器根据长期和短期功率测量，整个NSR和JVADAD指示的信号活动，为每个频段调整NSR。然后可以执行NSR适配。增益计算机利用这些NSR值来确定每个频带的增益因子。然后，增益乘法器可以执行每个频带的衰减。最后，在组合器中将分离的频带中的经处理的信号相加，以产生干净的输出信号。在本发明的另一实施例中，提出了一种抑制噪声的方法。本发明的替代实施例包括用于扩展DTMF音调的方法和装置。本发明的另一个实施例包括再生DTMF音调。

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