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公开(公告)号：US08275120B2
公开(公告)日：2012-09-25
申请号：US11421052
申请日：2006-05-30
IPC分类号： H04M9/08
CPC分类号： H04S7/305 , H04B3/23 , H04S2420/07
摘要： An acoustic echo cancellation technique. The present adaptive acoustic echo cancellation technique employs a plurality of acoustic echo cancellation filters which use different adaptation techniques which may employ different parameters such as step size, to improve both the adaptation algorithm convergence time and misadjustment over previously known acoustic echo cancellation techniques.
摘要翻译： 声回波消除技术。 本自适应声学回声消除技术采用多个声学回波消除滤波器，其使用不同的适应技术，其可以采用诸如步长之类的不同参数，以改善先前已知的声学回声消除技术的自适应算法收敛时间和误调整。
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公开(公告)号：US08213598B2
公开(公告)日：2012-07-03
申请号：US12037088
申请日：2008-02-26
IPC分类号： H04M9/08
摘要： Harmonic distortion residual echo suppression (HDRES) technique embodiments are presented which act to suppress the residual echo remaining after a near-end microphone signal has undergone AEC, including harmonic distortion in the signal that was caused by the speaker audio signal playback. In general, an AEC module is employed which suppresses some parts of the speaker audio signal found in a near-end microphone signal and generates an AEC output signal. A HDRES module then inputs the AEC output signal and the speaker audio signal, and suppresses at least a portion of a residual part of the speaker audio signal that was left unsuppressed by the AEC module. This includes at least a portion of the harmonic distortion exhibited in the AEC output signal.
摘要翻译： 提出了谐波失真残差回波抑制（HDRES）技术实施例，其用于抑制近端麦克风信号已经经历AEC之后剩余的残余回声，包括由扬声器音频信号回放引起的信号中的谐波失真。 通常，使用AEC模块，其抑制在近端麦克风信号中发现的扬声器音频信号的一些部分，并产生AEC输出信号。 然后，HDRES模块输入AEC输出信号和扬声器音频信号，并且抑制扬声器音频信号的残留部分的至少一部分，其被AEC模块未被压缩。 这包括在AEC输出信号中呈现的谐波失真的至少一部分。
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公开(公告)号：US08019075B2
公开(公告)日：2011-09-13
申请号：US11695447
申请日：2007-04-02
IPC分类号： H04M9/08
CPC分类号： H04M9/082
摘要： Hybrid echo canceller controllers are described herein. By way of example, a system for controlling an echo canceller can include a cross-correlator, a discriminator and an echo canceller controller. The cross-correlator can be configured to produce a cross-correlation based output that facilitates controlling the echo canceller by cross-correlating two signals associated with the echo canceller. The discriminator can be configured to produce a discriminator output that discriminates between near-end signal and echo in a corrupted signal. The echo canceller controller can be configured to control the echo canceller according to the cross-correlation based output and the discriminator output.
摘要翻译： 本文描述了混合回波消除器控制器。 作为示例，用于控制回波消除器的系统可以包括交叉相关器，鉴别器和回声消除器控制器。 互相关器可以被配置为产生基于互相关的输出，其有助于通过将与回波消除器相关联的两个信号相互关联来控制回波消除器。 鉴别器可以被配置为产生鉴别器输出，其鉴别受损信号中的近端信号和回波。 回波消除器控制器可以被配置为根据基于互相关的输出和鉴别器输出来控制回波消除器。
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公开(公告)号：US20090214048A1
公开(公告)日：2009-08-27
申请号：US12037088
申请日：2008-02-26
IPC分类号： H04B3/20
摘要： Harmonic distortion residual echo suppression (HDRES) technique embodiments are presented which act to suppress the residual echo remaining after a near-end microphone signal has undergone AEC, including harmonic distortion in the signal that was caused by the speaker audio signal playback. In general, an AEC module is employed which suppresses some parts of the speaker audio signal found in a near-end microphone signal and generates an AEC output signal. A HDRES module then inputs the AEC output signal and the speaker audio signal, and suppresses at least a portion of a residual part of the speaker audio signal that was left unsuppressed by the AEC module. This includes at least a portion of the harmonic distortion exhibited in the AEC output signal.
摘要翻译： 提出了谐波失真残差回波抑制（HDRES）技术实施例，其用于抑制近端麦克风信号已经经历AEC之后剩余的残余回声，包括由扬声器音频信号回放引起的信号中的谐波失真。 通常，使用AEC模块，其抑制在近端麦克风信号中发现的扬声器音频信号的一些部分，并产生AEC输出信号。 然后，HDRES模块输入AEC输出信号和扬声器音频信号，并且抑制扬声器音频信号的残留部分的至少一部分，其被AEC模块未被压缩。 这包括在AEC输出信号中呈现的谐波失真的至少一部分。
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公开(公告)号：US08014519B2
公开(公告)日：2011-09-06
申请号：US11695426
申请日：2007-04-02
IPC分类号： H04M9/08
CPC分类号： H04M9/082
摘要： Cross-correlation based echo canceller controllers are described herein. By way of example, a system for controlling an echo canceller having one or more adaptive filters can include one or more adaptive filter controllers each corresponding to one of the one or more adaptive filters and each configured to halt adaptation of its corresponding adaptive filter according to the cross-correlation of its corresponding corrupted signal and its corresponding error signal of its corresponding adaptive filter.
摘要翻译： 本文描述了基于互相关的回声消除器控制器。 作为示例，用于控制具有一个或多个自适应滤波器的回波消除器的系统可以包括一个或多个自适应滤波器控制器，每个自适应滤波器控制器对应于一个或多个自适应滤波器中的一个自适应滤波器，并且每个被配置为根据 其相应的损坏信号的互相关及其对应的自适应滤波器的相应误差信号。
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公开(公告)号：US08290181B2
公开(公告)日：2012-10-16
申请号：US11084608
申请日：2005-03-19
CPC分类号： H04R3/005 , H03G3/301 , H03G3/3089 , H04R3/02 , H04R2410/00 , H04R2430/01
摘要： A system level automatic gain control (“System AGC”) automatically initializes and controls analog microphone gain in an environment where multiple independent applications simultaneously receive an input from a single analog microphone or microphone array. In one embodiment, the System AGC also prevents those applications from acting to separately control the gain by intercepting external gain control commands and responding to the corresponding application with a corresponding digital gain applied to the input signal from the microphone. Consequently, the System AGC avoids problems relating to oscillations and instability in the microphone gain resulting from multiple applications trying to simultaneously control the gain while preventing each application from adversely affecting the quality of another application's audio capture signal. Further, in one embodiment, the System AGC also acts to maximize the signal to noise (SNR) ratio of the microphone without introducing clipping as a function of a sampled background environment.
摘要翻译： 在多个独立应用程序同时从单个模拟麦克风或麦克风阵列接收输入的环境中，系统级自动增益控制（系统AGC）自动初始化和控制模拟麦克风增益。 在一个实施例中，系统AGC还防止这些应用通过截取外部增益控制命令来单独地控制增益，并且以对应于来自麦克风的输入信号的相应数字增益作出响应。 因此，系统AGC避免了与多个应用程序尝试同时控制增益相关的麦克风增益的振荡和不稳定性问题，同时防止每个应用程序不利地影响另一应用程序的音频捕获信号的质量。 此外，在一个实施例中，系统AGC还用于使麦克风的信噪比（SNR）最大化，而不会引入作为采样的背景环境的函数的削波。
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公开(公告)号：US08081753B2
公开(公告)日：2011-12-20
申请号：US11695440
申请日：2007-04-02
IPC分类号： H04M9/08
CPC分类号： H04M9/082
摘要： Hybrid echo canceller controllers are described herein. By way of example, a system for controlling an echo canceller can include a signal indicator and an echo canceller controller. The signal indicator can be configured to indicate periods of near-end signal and to indicate periods of echo only with echo-path change in the corrupted signal based at least in part on cross-correlation between two signals associated with the echo canceller. The echo canceller controller can be configured to control the echo canceller according to indications from the signal indicator.
摘要翻译： 本文描述了混合回波消除器控制器。 作为示例，用于控制回波消除器的系统可以包括信号指示器和回波消除器控制器。 信号指示器可以被配置为指示近端信号的周期，并且至少部分地基于与回波消除器相关联的两个信号之间的互相关，仅指示被破坏的信号中的回波路径改变的回波周期。 回波消除器控制器可以被配置为根据来自信号指示器的指示来控制回波消除器。
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8.发明授权Systems and methods for echo cancellation with arbitrary playback sampling rates 有权具有任意回放采样率的回波消除的系统和方法公开(公告)号：US07251322B2
公开(公告)日：2007-07-31
申请号：US10785690
申请日：2004-02-24
IPC分类号： H04M9/08
CPC分类号： H04M9/082 , G10L2021/02082
摘要： The present invention relates to systems and methods that remove echo from a signal via a novel echo cancellation technique that supports arbitrary playback sampling rates. The novel echo cancellation technique transforms a playback signal to a frequency domain representation and converts its sampling rate to a sampling rate of a frequency domain transformed received signal for the appropriate number of frequency bins. This conversion is achieved via an exact or interpolated approached. The re-sampled playback signal transform is then utilized in connection with the received signal transform to remove echo associated with the playback signal from the received signal.
摘要翻译： 本发明涉及通过支持任意重放采样速率的新型回波消除技术从信号中去除回波的系统和方法。 新颖的回波消除技术将重放信号转换为频域表示，并将其采样率转换为频域变换的接收信号的采样率，以获得适当数量的频率仓。 这种转换是通过精确或内插逼近来实现的。 再采样的重放信号变换然后结合接收的信号变换使用，以从接收的信号去除与回放信号相关的回波。
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9.发明授权Infinite impulse response filter for 3D sound with tap delay line initialization 失效具有抽头延迟线初始化的3D声音的无限脉冲响应滤波器
公开(公告)号：US5835895A
公开(公告)日：1998-11-10
申请号：US910284
申请日：1997-08-13
申请人： Jack W. Stokes, III
发明人： Jack W. Stokes, III
CPC分类号： H03H17/0294
摘要： An audio processing system is used to process digital audio signals that represent sound emanating from a source that is moving through three dimensional space. The audio processing system has a filter unit that employs infinite impulse response (IIR) filters to filter the audio signals. The IIR filters have filter coefficients that change when the sound source is stationary or moves from one location to the next in the 3D space. To minimize the transient response following a coefficient change, the filter unit initializes elements in the tap delay lines of the IIR filters to non-zero values. In one implementation, the tap delay line elements are changed to a set of predetermined non-zero values. In another implementation, the tap delay line elements are initialized to the final values produced by the filter for the previous sound source location. A third implementation is to initialize the tap delay line elements to values that are a function of the new coefficients and the first sample of data at the new location. Yet another implementation is to initialize the tap delay line elements to steady state values produced in response to a step input.
摘要翻译： 音频处理系统用于处理表示从正在移动通过三维空间的源发出的声音的数字音频信号。 音频处理系统具有使用无限脉冲响应（IIR）滤波器对音频信号进行滤波的滤波器单元。 IIR滤波器具有当声源静止或从3D空间中的一个位置移动到下一个位置时改变的滤波器系数。 为了最小化系数变化后的瞬态响应，滤波器单元将IIR滤波器的抽头延迟线中的元素初始化为非零值。 在一个实现中，抽头延迟线元件被改变为一组预定的非零值。 在另一实现中，抽头延迟线元素被初始化为由先前声源位置的滤波器产生的最终值。 第三个实现是将抽头延迟线元素初始化为在新位置处的新系数和第一数据样本的函数的值。 另一个实施方式是将抽头延迟线元件初始化为响应于阶跃输入而产生的稳态值。
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公开(公告)号：US08103011B2
公开(公告)日：2012-01-24
申请号：US11669549
申请日：2007-01-31
摘要： Signal detectors are described herein. By way of example, a system for detecting signals can include a microphone signal detector, a loudspeaker signal detector, a signal discriminator and a decision component. When the microphone signal detector detects the presence of a microphone signal, the loudspeaker signal detector detects the presence of a loudspeaker signal and the signal discriminator determines that near-end speech dominates loudspeaker echo, the decision component can confirm the presence of doubletalk. When the microphone signal detector detects the presence of a microphone signal and the signal discriminator determines that near-end speech dominates loudspeaker echo, the decision component confirms the presence of near-end signal.
摘要翻译： 这里描述了信号检测器。 作为示例，用于检测信号的系统可以包括麦克风信号检测器，扬声器信号检测器，信号鉴别器和决定部件。 当麦克风信号检测器检测到麦克风信号的存在时，扬声器信号检测器检测到扬声器信号的存在，并且信号鉴别器确定近端语音主导扬声器回波，判定部件可以确认双音节的存在。 当麦克风信号检测器检测到麦克风信号的存在并且信号鉴别器确定近端语音主导扬声器回波时，决定部件确认近端信号的存在。
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