公开(公告)号：US20100145689A1

公开(公告)日：2010-06-10

申请号：US12328789

申请日：2008-12-05

Applicant: Qin Li ,  Michael Lewis Seltzer ,  Chao He

Inventor： Qin Li ,  Michael Lewis Seltzer ,  Chao He

IPC: G10L11/06

CPC classification number: G10L21/0208 ,  G10L21/0232

Abstract: An audio signal is received that might include keyboard noise and speech. The audio signal is digitized and transformed from a time domain to a frequency domain. The transformed audio is analyzed to determine whether there is likelihood that keystroke noise is present. If it is determined there is high likelihood that the audio signal contains keystroke noise, a determination is made as to whether a keyboard event occurred around the time of the likely keystroke noise. If it is determined that a keyboard event occurred around the time of the likely keystroke noise, a determination is made as to whether speech is present in the audio signal around the time of the likely keystroke noise. If no speech is present, the keystroke noise is suppressed in the audio signal. If speech is detected in the audio signal or if the keystroke noise abates, the suppression gain is removed from the audio signal.

Abstract translation: 接收到可能包括键盘噪音和语音的音频信号。 音频信号被数字化并从时域变换到频域。 分析变换的音频以确定是否存在按键噪声的可能性。 如果确定音频信号包含击键噪声的可能性很高，则确定在可能的击键噪声的时间周围是否发生键盘事件。 如果确定在可能的击键噪声的时间周围发生键盘事件，则确定在可能的击键噪声的时间周围的音频信号中是否存在语音。 如果不存在语音，则在音频信号中抑制击键噪声。 如果在音频信号中检测到语音，或者如果击键噪声消失，则从音频信号中去除抑制增益。

公开(公告)号：US08213635B2

公开(公告)日：2012-07-03

申请号：US12328789

申请日：2008-12-05

Applicant: Qin Li ,  Michael Lewis Seltzer ,  Chao He

Inventor： Qin Li ,  Michael Lewis Seltzer ,  Chao He

IPC: H04B15/00 ,  G10L11/06

CPC classification number: G10L21/0208 ,  G10L21/0232

Abstract: An audio signal is received that might include keyboard noise and speech. The audio signal is digitized and transformed from a time domain to a frequency domain. The transformed audio is analyzed to determine whether there is likelihood that keystroke noise is present. If it is determined there is high likelihood that the audio signal contains keystroke noise, a determination is made as to whether a keyboard event occurred around the time of the likely keystroke noise. If it is determined that a keyboard event occurred around the time of the likely keystroke noise, a determination is made as to whether speech is present in the audio signal around the time of the likely keystroke noise. If no speech is present, the keystroke noise is suppressed in the audio signal. If speech is detected in the audio signal or if the keystroke noise abates, the suppression gain is removed from the audio signal.

Abstract translation: 接收到可能包括键盘噪音和语音的音频信号。 音频信号被数字化并从时域变换到频域。 分析变换的音频以确定是否存在按键噪声的可能性。 如果确定音频信号包含击键噪声的可能性很高，则确定在可能的击键噪声的时间周围是否发生键盘事件。 如果确定在可能的击键噪声的时间周围发生键盘事件，则确定在可能的击键噪声的时间周围的音频信号中是否存在语音。 如果不存在语音，则在音频信号中抑制击键噪声。 如果在音频信号中检测到语音，或者如果击键噪声消失，则从音频信号中去除抑制增益。

公开(公告)号：US08942370B2

公开(公告)日：2015-01-27

申请号：US13411865

申请日：2012-03-05

Applicant: Qin Li ,  Wei-ge Chen ,  Chao He

Inventor： Qin Li ,  Wei-ge Chen ,  Chao He

IPC: H04M9/08

CPC classification number: H04M9/082

Abstract: 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.

Abstract translation: 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

Applicant: Qin Li ,  Wei-ge Chen ,  Chao He

Inventor： Qin Li ,  Wei-ge Chen ,  Chao He

IPC: H04M9/08

CPC classification number: H04M9/082

Abstract: 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.

Abstract translation: 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：US07831035B2

公开(公告)日：2010-11-09

申请号：US11413710

申请日：2006-04-28

Applicant: Jack W. Stokes ,  Chao He ,  Qin Li

Inventor： Jack W. Stokes ,  Chao He ,  Qin Li

IPC: H04M9/08

CPC classification number: H04M9/082

Abstract: Center clipping is applied with acoustic echo suppression in a two-way voice communication system to reduce a microphone signal to the background noise floor when speech is not present. For integration with a microphone array, the center clipping processing determines whether speech is present based on estimates of the overall leak through and instantaneous microphone power across the microphone array channels. The overall estimates can be calculated as a dot product of the microphone array coefficients computed by a sound source localization process and separate estimates for the respective microphone channel.

Abstract translation: 在双向语音通信系统中，中心限幅被应用于声学回声抑制，以在不存在语音时将麦克风信号减小到背景噪声底层。 为了与麦克风阵列集成，基于麦克风阵列通道上的总泄漏和瞬时麦克风功率的估计，中心削波处理确定语音是否存在。 可以将总体估计值计算为由声源定位处理计算的麦克风阵列系数和各个麦克风通​​道的单独估计的点乘积。

公开(公告)号：US20070263850A1

公开(公告)日：2007-11-15

申请号：US11414776

申请日：2006-04-28

Applicant: Jack Stokes ,  Chao He ,  Qin LI ,  Arungunram Surendran

Inventor： Jack Stokes ,  Chao He ,  Qin LI ,  Arungunram Surendran

IPC: H04M9/08

CPC classification number: H04M9/082

Abstract: Acoustic echo cancellation, residual echo suppression and sound-source localization/microphone array processes are combined in a two-way voice communication system that uses a microphone array to capture local speech. The processes can be configured according to various alternative architectures and enhancements made to the processes to avoid the adverse effects of non-linear operations in the residual echo suppression on the sound-source localization/microphone array process.

Abstract translation: 声回波消除，残余回声抑制和声源定位/麦克风阵列处理被组合在使用麦克风阵列捕获本地语音的双向语音通信系统中。 这些过程可以根据各种替代架构进行配置，并且对进程进行增强，以避免非线性操作对声源定位/麦克风阵列处理中的残余回声抑制的不利影响。

公开(公告)号：US08295475B2

公开(公告)日：2012-10-23

申请号：US11332500

申请日：2006-01-13

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

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

IPC: H04M9/08

CPC classification number: H04M9/082

Abstract: 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.

Abstract translation: 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

Applicant: Qin Li ,  Wei-ge Chen ,  Chao He

Inventor： Qin Li ,  Wei-ge Chen ,  Chao He

IPC: G10K11/16

CPC classification number: H04M9/082

Abstract: 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.

Abstract translation: 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：US20090207763A1

公开(公告)日：2009-08-20

申请号：US12032589

申请日：2008-02-15

Applicant: Qin Li ,  Chao He

Inventor： Qin Li ,  Chao He

IPC: H04B3/20

CPC classification number: H04M9/082

Abstract: A voice communication end device performs quality checks to determine whether acoustic echo cancellation would be ineffective, such as due to noise or clock drift or discontinuities between incoming and outgoing voice channels. In the case where echo cancellation would prove ineffective, the device falls back on a tri-state voice switching operation that includes a bi-direction state in which both channels are on in full duplex operation, which provides a smoother transition switching between active channels. The tri-state voice switching supports both voluntary transitions where the active user voluntarily stops to yield the active channel, and forced transitions where the active user is forcedly interrupted by the other user speaking more loudly.

Abstract translation: 语音通信终端设备执行质量检查以确定声学回声消除是否无效，例如由于噪声或时钟漂移或入站和出局语音信道之间的不连续性。 在回声消除无效的情况下，设备退回到三态语音切换操作，该三态语音切换操作包括双向状态，其中两个信道都是全双工操作，这在主动信道之间提供更平滑的转换切换。 三态语音切换支持主动用户自愿停止以产生活动信道的自愿转换，以及强制转换，其中主动用户被其他用户强烈地更大声地中断。

公开(公告)号：US20080259828A1

公开(公告)日：2008-10-23

申请号：US11788939

申请日：2007-04-23

Applicant: Chao He ,  Qin Li ,  Wei-ge Chen

Inventor： Chao He ,  Qin Li ,  Wei-ge Chen

IPC: H04B15/00

CPC classification number: H04M9/082

Abstract: 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.

Abstract translation: 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。