公开(公告)号：US20060210096A1

公开(公告)日：2006-09-21

申请号：US11084608

申请日：2005-03-19

申请人： Jack Stokes ,  John Platt ,  David Stevens

发明人： Jack Stokes ,  John Platt ,  David Stevens

IPC分类号： H03G3/00 ,  H03G9/00

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： 系统级自动增益控制（“系统AGC”）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。

公开(公告)号：US08416946B2

公开(公告)日：2013-04-09

申请号：US12890075

申请日：2010-09-24

申请人： Amit Chhetri ,  Arungunram Surendran ,  Jack Stokes ,  John Platt

发明人： Amit Chhetri ,  Arungunram Surendran ,  Jack Stokes ,  John Platt

IPC分类号： H04M9/08

CPC分类号： H04M9/082

摘要： A regression-based residual echo suppression (RES) system and process for suppressing the portion of the microphone signal corresponding to a playback of a speaker audio signal that was not suppressed by an acoustic echo canceller (AEC). In general, a prescribed regression technique is used between a prescribed spectral attribute of multiple past and present, fixed-length, periods (e.g., frames) of the speaker signal and the same spectral attribute of a current period (e.g., frame) of the echo residual in the output of the AEC. This automatically takes into consideration the correlation between the time periods of the speaker signal. The parameters of the regression can be easily tracked using adaptive methods. Multiple applications of RES can be used to produce better results and this system and process can be applied to stereo-RES as well.

摘要翻译： 基于回归的残差回波抑制（RES）系统和用于抑制对应于未被声学回声消除器（AEC）抑制的扬声器音频信号的重放的麦克风信号的部分的处理。 通常，在多个过去和现在，固定长度的扬声器信号的周期（例如，帧）和当前周期（例如，帧）的相同频谱属性之间使用规定的回归技术 AEC输出中的回波残差。 这自动考虑了扬声器信号的时间段之间的相关性。 可以使用自适应方法轻松跟踪回归的参数。 RES的多个应用可以用于产生更好的结果，并且该系统和过程也可以应用于立体声RES。

公开(公告)号：US20060002547A1

公开(公告)日：2006-01-05

申请号：US10883128

申请日：2004-06-30

申请人： Jack Stokes ,  John Platt

发明人： Jack Stokes ,  John Platt

IPC分类号： H04M9/08

CPC分类号： H04M9/082

摘要： A method and system of multi-channel echo cancellation using round robin regularization. The multi-channel round robin regularization echo cancellation method includes applying a plurality of adaptive filters, each having an inverse correlation matrix, to the multi-channel playback signal. Each of the plurality of adaptive filters is selected in a round robin sequence, so that every round each of the filters is selected. The inverse correlation matrix associated with each selected adaptive filter then is regularized as needed. The regularized adaptive filter then is used to remove the echo of the multi-channel playback signal from a captured signal. Regularization is implemented in a round robin manner to ensure that each subband is selected so that the adaptive filter for that subband can be examined. Other features of the multi-channel echo cancellation system and method include dynamic switching between monaural and multi-channel echo cancellation and mixed processing for lower and upper subbands.

摘要翻译： 使用循环正则化的多通道回波消除的方法和系统。 多频道循环正则化回波消除方法包括将多个具有逆相关矩阵的自适应滤波器应用于多声道重放信号。 以循环序列选择多个自适应滤波器中的每一个，使得每一个滤波器的每一个被选择。 然后根据需要对与每个选择的自适应滤波器相关联的逆相关矩阵进行规则化。 然后，正则化自适应滤波器用于从捕获的信号中去除多声道重放信号的回波。 以循环方式实现正则化，以确保每个子带被选择，使得可以检查该子带的自适应滤波器。 多通道回波消除系统和方法的其他特征包括单声道和多声道回波消除之间的动态切换以及用于下部和上部子带的混合处理。

公开(公告)号：US07813499B2

公开(公告)日：2010-10-12

申请号：US11097548

申请日：2005-03-31

申请人： Amit Chhetri ,  Arungunram Surendran ,  Jack Stokes ,  John Platt

发明人： Amit Chhetri ,  Arungunram Surendran ,  Jack Stokes ,  John Platt

IPC分类号： H04M9/08

CPC分类号： H04M9/082

摘要： A regression-based residual echo suppression (RES) system and process for suppressing the portion of the microphone signal corresponding to a playback of a speaker audio signal that was not suppressed by an acoustic echo canceller (AEC). In general, a prescribed regression technique is used between a prescribed spectral attribute of multiple past and present, fixed-length, periods (e.g., frames) of the speaker signal and the same spectral attribute of a current period (e.g., frame) of the echo residual in the output of the AEC. This automatically takes into consideration the correlation between the time periods of the speaker signal. The parameters of the regression can be easily tracked using adaptive methods. Multiple applications of RES can be used to produce better results and this system and process can be applied to stereo-RES as well.

摘要翻译： 基于回归的残差回波抑制（RES）系统和用于抑制对应于未被声学回声消除器（AEC）抑制的扬声器音频信号的重放的麦克风信号的部分的处理。 通常，在多个过去和现在，固定长度的扬声器信号的周期（例如，帧）和当前周期（例如，帧）的相同频谱属性之间使用规定的回归技术 AEC输出中的回波残差。 这自动考虑了扬声器信号的时间段之间的相关性。 可以使用自适应方法轻松跟踪回归的参数。 RES的多个应用可以用于产生更好的结果，并且该系统和过程也可以应用于立体声RES。

公开(公告)号：US20060222172A1

公开(公告)日：2006-10-05

申请号：US11097548

申请日：2005-03-31

申请人： Amit Chhetri ,  Arungunram Surendran ,  Jack Stokes ,  John Platt

发明人： Amit Chhetri ,  Arungunram Surendran ,  Jack Stokes ,  John Platt

IPC分类号： H04M9/08

CPC分类号： H04M9/082

摘要： A regression-based residual echo suppression (RES) system and process for suppressing the portion of the microphone signal corresponding to a playback of a speaker audio signal that was not suppressed by an acoustic echo canceller (AEC). In general, a prescribed regression technique is used between a prescribed spectral attribute of multiple past and present, fixed-length, periods (e.g., frames) of the speaker signal and the same spectral attribute of a current period (e.g., frame) of the echo residual in the output of the AEC. This automatically takes into consideration the correlation between the time periods of the speaker signal. The parameters of the regression can be easily tracked using adaptive methods. Multiple applications of RES can be used to produce better results and this system and process can be applied to stereo-RES as well.

公开(公告)号：US20060002546A1

公开(公告)日：2006-01-05

申请号：US11150017

申请日：2005-06-10

申请人： Jack Stokes ,  John Platt

发明人： Jack Stokes ,  John Platt

IPC分类号： H04M9/08

CPC分类号： H04M9/082

摘要： An echo cancellation technique that can process multi-input microphone signals with only a small increase in the overall CPU consumption compared to implementing the algorithm for a single channel microphone signal. Furthermore, the invention provides an architecture that provides for echo cancellation for multiple applications in parallel with only a small increase in CPU consumption compared to a single instance of echo cancellation with a single microphone input and multi-output channel playback.

摘要翻译： 与实现单通道麦克风信号的算法相比，可以处理多输入麦克风信号的回声消除技术与总体CPU消耗相比只有小的增加。 此外，本发明提供了一种架构，其与单个麦克风输入和多输出通道重放的单个回声消除实例相比，仅仅与CPU消耗的小的增加并行地提供多个应用的​​回波消除。

公开(公告)号：US20070047738A1

公开(公告)日：2007-03-01

申请号：US11465098

申请日：2006-08-16

申请人： Joseph Ballantyne ,  Jack Stokes ,  Henrique Malvar

发明人： Joseph Ballantyne ,  Jack Stokes ,  Henrique Malvar

IPC分类号： H04B3/20

CPC分类号： H04B3/493 ,  H04M9/082

摘要： A system and method for adaptive estimation and compensation of clock drift in echo cancellers is provided. The invention includes an acoustic echo cancellation system with a built in adaptive clock drift compensation system. The acoustic echo cancellation system has an AEC component that performs acoustic echo cancellation on data from a capture buffer, by also using information derived from a render buffer. The clock drift compensation system has access to this capture buffer and render buffer. The clock drift compensation system includes a clock drift compensator that calculates, based on the current location of the capture data being processed by the AEC component as well as additional information, the ideal location in the render buffer from which the AEC component should process data. The clock drift compensator further adjusts the current location in the render buffer from which the AEC component processes data based, at least in part, upon this ideal location. The clock drift compensator can further detect and correct for glitches in the hardware positions received from the render and capture devices.

摘要翻译： 提供了一种用于回波消除器中的时钟漂移的自适应估计和补偿的系统和方法。 本发明包括具有内置自适应时钟漂移补偿系统的声学回波消除系统。 声学回声消除系统具有通过也使用从渲染缓冲器导出的信息来执行来自捕获缓冲器的数据的声学回声消除的AEC分量。 时钟漂移补偿系统可以访问此捕获缓冲区和渲染缓冲区。 时钟漂移补偿系统包括时钟漂移补偿器，其基于由AEC组件处理的捕获数据的当前位置以及附加信息计算AEC组件应从其处理数据的渲染缓冲区中的理想位置。 时钟漂移补偿器进一步调整渲染缓冲器中的当前位置，AEC组件至少部分地基于该理想位置处理数据。 时钟漂移补偿器可以进一步检测和纠正从渲染和捕获设备接收的硬件位置的毛刺。

公开(公告)号：US20120159620A1

公开(公告)日：2012-06-21

申请号：US13159978

申请日：2011-06-14

申请人： Christian Seifert ,  Jack Stokes ,  Long Lu ,  David Heckerman ,  Christina Colcernian ,  Sasi Parthasarathy ,  Navaneethan Santhanam

发明人： Christian Seifert ,  Jack Stokes ,  Long Lu ,  David Heckerman ,  Christina Colcernian ,  Sasi Parthasarathy ,  Navaneethan Santhanam

IPC分类号： G06F21/00

CPC分类号： H04L63/1483 ,  H04L63/1416 ,  H04L63/168

摘要： A machine-implemented method for detecting scareware includes the steps of accessing one or more landing pages to be evaluated, extracting one or more features from the landing pages, and providing a classifier to compare the features extracted from the landing pages with features of known scareware and non-scareware pages. The classifier determines a likelihood that the landing page is scareware. If determined to be scareware, the landing page is removed from search results generated by a search engine. The features can be URLs, text, image interest points, image descriptors, a number of pop-ups generated, IP addresses, hostnames, domain names, text derived from images, images, metadata, identifiers of executables, and combinations thereof.

摘要翻译： 用于检测scareware的机器实现的方法包括访问要评估的一个或多个着陆页，从着陆页提取一个或多个特征并提供分类器以将从着陆页提取的特征与已知scareware的特征进行比较的步骤 和非scareware页面。 分类器确定着陆页是scareware的可能性。 如果确定是scareware，则着陆页将从搜索引擎生成的搜索结果中删除。 特征可以是URL，文本，图像兴趣点，图像描述符，生成的弹出窗口的数量，IP地址，主机名，域名，从图像，图像，元数据，可执行文件的标识符以及它们的组合导出的文本。

公开(公告)号：US20070263849A1

公开(公告)日：2007-11-15

申请号：US11413710

申请日：2006-04-28

申请人： Jack Stokes ,  Chao He ,  Qin Li

发明人： Jack Stokes ,  Chao He ,  Qin Li

IPC分类号： H04M9/08

CPC分类号： H04M9/082

摘要： 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.

摘要翻译： 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：US20050089148A1

公开(公告)日：2005-04-28

申请号：US10785690

申请日：2004-02-24

申请人： Jack Stokes ,  Henrique Malvar

发明人： Jack Stokes ,  Henrique Malvar

IPC分类号： H04M1/00 ,  G06F17/00 ,  H04B3/23 ,  H04M1/58 ,  H04M9/08 ,  H04M1/24

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。