公开(公告)号：US08942370B2

公开(公告)日：2015-01-27

申请号：US13411865

申请日：2012-03-05

申请人： Qin Li ,  Wei-ge Chen ,  Chao He

发明人： Qin Li ,  Wei-ge Chen ,  Chao He

IPC分类号： H04M9/08

CPC分类号： H04M9/082

摘要： A communications device is presented for providing bi-directional audio communications between a near-end user and a far-end user via a bidirectional communications channel. The communications device includes an adaptive echo canceller receiving a near-end audio signal and a far-end audio signal and providing an echo-canceled near-end audio signal for transmission to the far-end user via the communications channel. The adaptive echo canceller includes a first bank of analysis filters for filtering the near-end audio signal, a second bank of analysis filters for filtering the far-end audio signal, and a bank of synthesis filters for filtering sub-band echo-canceled signals generated within the adaptive echo canceller. The first and second filter banks have a frequency response optimized to reduce echo residual gain.

摘要翻译： 呈现通信设备，用于经由双向通信信道在近端用户和远端用户之间提供双向音频通信。 通信设备包括接收近端音频信号和远端音频信号的自适应回波消除器，并提供回波消除的近端音频信号，以经由通信信道传输给远端用户。 自适应回波消除器包括用于滤波近端音频信号的第一组分析滤波器，用于滤波远端音频信号的第二组分析滤波器，以及用于滤波子带回波消除信号的一组合成滤波器 在自适应回波消除器内产生。 第一和第二滤波器组具有优化的频率响应以减少回波残余增益。

公开(公告)号：US08155304B2

公开(公告)日：2012-04-10

申请号：US11784893

申请日：2007-04-10

申请人： Qin Li ,  Wei-ge Chen ,  Chao He

发明人： Qin Li ,  Wei-ge Chen ,  Chao He

IPC分类号： H04M9/08

CPC分类号： H04M9/082

摘要： A communications device is presented for providing bi-directional audio communications between a near-end user and a far-end user via a bidirectional communications channel. The communications device includes an adaptive echo canceller receiving a near-end audio signal and a far-end audio signal and providing an echo-canceled near-end audio signal for transmission to the far-end user via the communications channel. The adaptive echo canceller includes a first bank of analysis filters for filtering the near-end audio signal, a second bank of analysis filters for filtering the far-end audio signal, and a bank of synthesis filters for filtering sub-band echo-canceled signals generated within the adaptive echo canceller. The first and second filter banks have a frequency response optimized to reduce echo residual gain.

摘要翻译： 呈现通信设备，用于经由双向通信信道在近端用户和远端用户之间提供双向音频通信。 通信设备包括接收近端音频信号和远端音频信号的自适应回波消除器，并提供回波消除的近端音频信号，以经由通信信道传输给远端用户。 自适应回波消除器包括用于滤波近端音频信号的第一组分析滤波器，用于滤波远端音频信号的第二组分析滤波器，以及用于滤波子带回波消除信号的一组合成滤波器 在自适应回波消除器内产生。 第一和第二滤波器组具有优化的频率响应以减少回波残余增益。

公开(公告)号：US08295475B2

公开(公告)日：2012-10-23

申请号：US11332500

申请日：2006-01-13

申请人： Qin Li ,  Chao He ,  Wei-Ge Chen ,  Mu Han

发明人： Qin Li ,  Chao He ,  Wei-Ge Chen ,  Mu Han

IPC分类号： H04M9/08

CPC分类号： H04M9/082

摘要： The quality and robustness of audio echo cancellation is enhanced by selectively applying glitch recovery processes based on a quality measurement of the relative offset between capture and render audio streams. For example, large and small glitch detection is enabled for low relative offset variance; large glitch detection is enabled in a medium range of relative offset variance; and neither enabled at high variance. Further, a fast glitch recovery process suspends updating the adaptive filter coefficients of the audio echo cancellation while buffers are re-aligned to recover from the glitch, so as to avoid resetting the adaptive filter. When clock drift exists between capture and render audio streams, a multi-step compensation method is applied to improve AEC output quality in case the drifting rate is low; and a resampler is used to compensate the drift in case the drifting rate is high. An anti-clipping process detects clipping of the signals, and also suspends adaptive filter updating during clipping.

摘要翻译： 通过基于捕获和渲染音频流之间的相对偏移的质量测量来选择性地应用毛刺恢复过程来增强音频回声消除的质量和鲁棒性。 例如，对于低相对偏移方差，启用大的和小的毛刺检测; 在相对偏移方差的中等范围内启用大毛刺检测; 并且在高方差时都不启用。 此外，快速毛刺恢复处理暂停更新音频回声消除的自适应滤波器系数，同时缓冲器被重新对准以从毛刺恢复，以避免复位自适应滤波器。 当捕获和渲染音频流之间存在时钟漂移时，应用多步补偿方法来提高漂移率低的AEC输出质量; 并且在漂移速率高的情况下使用重采样器来补偿漂移。 反剪辑过程检测信号的剪辑，并且还可以在剪辑期间暂停自适应滤波器更新。

公开(公告)号：US20120163615A1

公开(公告)日：2012-06-28

申请号：US13411865

申请日：2012-03-05

申请人： Qin Li ,  Wei-ge Chen ,  Chao He

发明人： Qin Li ,  Wei-ge Chen ,  Chao He

IPC分类号： G10K11/16

CPC分类号： H04M9/082

摘要： A communications device is presented for providing bi-directional audio communications between a near-end user and a far-end user via a bidirectional communications channel. The communications device includes an adaptive echo canceller receiving a near-end audio signal and a far-end audio signal and providing an echo-canceled near-end audio signal for transmission to the far-end user via the communications channel. The adaptive echo canceller includes a first bank of analysis filters for filtering the near-end audio signal, a second bank of analysis filters for filtering the far-end audio signal, and a bank of synthesis filters for filtering sub-band echo-canceled signals generated within the adaptive echo canceller. The first and second filter banks have a frequency response optimized to reduce echo residual gain.

摘要翻译： 呈现通信设备，用于经由双向通信信道在近端用户和远端用户之间提供双向音频通信。 通信设备包括接收近端音频信号和远端音频信号的自适应回波消除器，并提供回波消除的近端音频信号，以经由通信信道传输给远端用户。 自适应回波消除器包括用于滤波近端音频信号的第一组分析滤波器，用于滤波远端音频信号的第二组分析滤波器，以及用于滤波子带回波消除信号的一组合成滤波器 在自适应回波消除器内产生。 第一和第二滤波器组具有优化的频率响应以减少回波残余增益。

公开(公告)号：US20080259828A1

公开(公告)日：2008-10-23

申请号：US11788939

申请日：2007-04-23

申请人： Chao He ,  Qin Li ,  Wei-ge Chen

发明人： Chao He ,  Qin Li ,  Wei-ge Chen

IPC分类号： H04B15/00

CPC分类号： H04M9/082

摘要： A communication end device of a two-way communication system is shown. The device includes an audio signal capture device for capturing local audio to be transmitted to another end device, an audio signal rendering device for playing remote audio received from the other end device, and buffers for buffering the captured and rendered audio signals. The device also includes an audio echo canceller operating to predict echo from the rendered audio signal at a calculated relative offset in the captured audio signal based on an adaptive filter, and subtract the predicted echo from the signal transmitted to the other end device The calculated relative offset that is used by the audio echo canceller for a current signal sample is adjusted if a difference between it and an adjusted relative offset of a preceding sample exceeds a threshold value.

摘要翻译： 示出了双向通信系统的通信终端设备。 该装置包括用于捕获要发送到另一终端设备的本地音频的音频信号捕获设备，用于播放从另一端设备接收的远程音频的音频信号渲染设备，以及用于缓冲所捕获和渲染的音频信号的缓冲器。 该装置还包括音频回波消除器，其操作以基于自适应滤波器在所捕获的音频信号中以计算的相对偏移来预测来自渲染音频信号的回波，并且从发送到另一端装置的信号中减去预测回波。计算的相对 当音频回波消除器用于当前信号样本的偏移量如果其与先前样本的经调整的相对偏移之间的差异超过阈值则被调整。

公开(公告)号：US20080253553A1

公开(公告)日：2008-10-16

申请号：US11784893

申请日：2007-04-10

申请人： Qin Li ,  Wei-ge Chen ,  Chao He

发明人： Qin Li ,  Wei-ge Chen ,  Chao He

IPC分类号： H04M9/08

CPC分类号： H04M9/082

摘要： A communications device is presented for providing bi-directional audio communications between a near-end user and a far-end user via a bidirectional communications channel. The communications device includes an adaptive echo canceller receiving a near-end audio signal and a far-end audio signal and providing an echo-canceled near-end audio signal for transmission to the far-end user via the communications channel. The adaptive echo canceller includes a first bank of analysis filters for filtering the near-end audio signal, a second bank of analysis filters for filtering the far-end audio signal, and a bank of synthesis filters for filtering sub-band echo-canceled signals generated within the adaptive echo canceller. The first and second filter banks have a frequency response optimized to reduce echo residual gain.

摘要翻译： 呈现通信设备，用于经由双向通信信道在近端用户和远端用户之间提供双向音频通信。 通信设备包括接收近端音频信号和远端音频信号的自适应回波消除器，并提供回波消除的近端音频信号，以经由通信信道传输给远端用户。 自适应回波消除器包括用于滤波近端音频信号的第一组分析滤波器，用于滤波远端音频信号的第二组分析滤波器，以及用于滤波子带回波消除信号的一组合成滤波器 在自适应回波消除器内产生。 第一和第二滤波器组具有优化的频率响应以减少回波残余增益。

公开(公告)号：US08259928B2

公开(公告)日：2012-09-04

申请号：US11788939

申请日：2007-04-23

申请人： Chao He ,  Qin Li ,  Wei-ge Chen

发明人： Chao He ,  Qin Li ,  Wei-ge Chen

IPC分类号： H04M9/08

CPC分类号： H04M9/082

摘要： A communication end device of a two-way communication system is shown. The device includes an audio signal capture device for capturing local audio to be transmitted to another end device, an audio signal rendering device for playing remote audio received from the other end device, and buffers for buffering the captured and rendered audio signals. The device also includes an audio echo canceller operating to predict echo from the rendered audio signal at a calculated relative offset in the captured audio signal based on an adaptive filter, and subtract the predicted echo from the signal transmitted to the other end device The calculated relative offset that is used by the audio echo canceller for a current signal sample is adjusted if a difference between it and an adjusted relative offset of a preceding sample exceeds a threshold value.

摘要翻译： 示出了双向通信系统的通信终端设备。 该装置包括用于捕获要发送到另一终端设备的本地音频的音频信号捕获设备，用于播放从另一端设备接收的远程音频的音频信号渲染设备，以及用于缓冲所捕获和渲染的音频信号的缓冲器。 该装置还包括音频回波消除器，其操作以基于自适应滤波器在所捕获的音频信号中以计算的相对偏移来预测来自渲染音频信号的回波，并且从发送到另一端装置的信号中减去预测回波。计算的相对 当音频回波消除器用于当前信号样本的偏移量如果其与先前样本的经调整的相对偏移之间的差异超过阈值则被调整。

公开(公告)号：US20070165838A1

公开(公告)日：2007-07-19

申请号：US11332500

申请日：2006-01-13

申请人： Qin Li ,  Chao He ,  Wei-Ge Chen ,  Mu Han

发明人： Qin Li ,  Chao He ,  Wei-Ge Chen ,  Mu Han

IPC分类号： A61F11/06 ,  H04M9/08 ,  G10K11/16 ,  H03B29/00

CPC分类号： H04M9/082

摘要： The quality and robustness of audio echo cancellation is enhanced by selectively applying glitch recovery processes based on a quality measurement of the relative offset between capture and render audio streams. For example, large and small glitch detection is enabled for low relative offset variance; large glitch detection is enabled in a medium range of relative offset variance; and neither enabled at high variance. Further, a fast glitch recovery process suspends updating the adaptive filter coefficients of the audio echo cancellation while buffers are re-aligned to recover from the glitch, so as to avoid resetting the adaptive filter. When clock drift exists between capture and render audio streams, a multi-step compensation method is applied to improve AEC output quality in case the drifting rate is low; and a resampler is used to compensate the drift in case the drifting rate is high. An anti-clipping process detects clipping of the signals, and also suspends adaptive filter updating during clipping.

摘要翻译： 通过基于捕获和渲染音频流之间的相对偏移的质量测量来选择性地应用毛刺恢复过程来增强音频回声消除的质量和鲁棒性。 例如，对于低相对偏移方差，启用大的和小的毛刺检测; 在相对偏移方差的中等范围内启用大毛刺检测; 并且在高方差时都不启用。 此外，快速毛刺恢复处理暂停更新音频回声消除的自适应滤波器系数，同时缓冲器被重新对准以从毛刺恢复，以避免复位自适应滤波器。 当捕获和渲染音频流之间存在时钟漂移时，应用多步补偿方法来提高漂移率低的AEC输出质量; 并且在漂移速率高的情况下使用重采样器来补偿漂移。 反剪辑过程检测信号的剪辑，并且还可以在剪辑期间暂停自适应滤波器更新。

公开(公告)号：US08108221B2

公开(公告)日：2012-01-31

申请号：US12468019

申请日：2009-05-18

申请人： Wei-Ge Chen ,  Chao He

发明人： Wei-Ge Chen ,  Chao He

IPC分类号： G10L19/00

CPC分类号： G10L19/008 ,  G10L19/0017 ,  G10L19/0212 ,  G10L19/025 ,  G10L19/06 ,  G10L19/24 ,  G10L2015/025

摘要： A mixed lossless audio compression has application to a unified lossy and lossless audio compression scheme that combines lossy and lossless audio compression within a same audio signal. The mixed lossless compression codes a transition frame between lossy and lossless coding frames to produce seamless transitions. The mixed lossless coding performs a lapped transform and inverse lapped transform to produce an appropriately windowed and folded pseudo-time domain frame, which can then be losslessly coded. The mixed lossless coding also can be applied for frames that exhibit poor lossy compression performance.

摘要翻译： 混合无损音频压缩应用于统一的有损和无损音频压缩方案，将相同音频信号中的有损和无损音频压缩相结合。 混合无损压缩编码有损和无损编码帧之间的转换帧，以产生无缝转换。 混合无损编码执行重叠变换和逆重叠变换，以产生适当窗口化和折叠的伪时域帧，然后可以对其进行无损编码。 混合无损编码也可以应用于表现出差的有损压缩性能的帧。

公开(公告)号：US07693709B2

公开(公告)日：2010-04-06

申请号：US11183297

申请日：2005-07-15

申请人： Naveen Thumpudi ,  Wei-Ge Chen ,  Chao He

发明人： Naveen Thumpudi ,  Wei-Ge Chen ,  Chao He

IPC分类号： G10L19/14 ,  G10L19/02 ,  G10L19/00

CPC分类号： G10L19/022 ,  G10L19/008 ,  G10L19/0212

摘要： Techniques and tools for reordering of spectral coefficients in encoding and decoding are described herein. For certain types and patterns of content, coefficient reordering reduces redundancy that is due to periodic patterns in the spectral coefficients, making subsequent entropy encoding more efficient. For example, an audio encoder receives spectral coefficients logically organized along one dimension such as frequency, reorders at least some of the spectral coefficients, and entropy encodes the spectral coefficients after the reordering. Or, an audio decoder receives entropy encoded information for such spectral coefficients, entropy decodes the information, and reverses reordering of at least some of the spectral coefficients.

摘要翻译： 本文描述了用于在编码和解码中重新排序频谱系数的技术和工具。 对于某些类型和内容模式，系数重新排序减少了由于频谱系数中的周期性模式造成的冗余，使后续的熵编码更有效率。 例如，音频编码器接收沿着诸如频率的一个维度逻辑组织的频谱系数，对至少一些频谱系数进行重新排序，以及对重新排序之后的频谱系数进行熵编码。 或者，音频解码器接收这种频谱系数的熵编码信息，熵解码信息，并且反转至少一些频谱系数的重新排序。