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公开(公告)号：US20200336602A1
公开(公告)日：2020-10-22
申请号：US16920518
申请日：2020-07-03
Applicant: Imagination Technologies Limited
Inventor： Senthil Kumar Mani , Srinivas Akella , Anupama Ghantasala
IPC: H04M9/08
Abstract: An echo cancellation detector for controlling an acoustic echo canceller that is configured to cancel an echo of a far-end signal in a near-end signal in a telephony system, the echo cancellation detector comprising a comparison generator configured to compare the far-end signal with the near-end signal, a decision unit configured to make a determination about a first acoustic echo canceller based on that comparison and a controller configured to control an operation of a second acoustic echo canceller in dependence on the determination.
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公开(公告)号：US20160133264A1
公开(公告)日：2016-05-12
申请号：US14934658
申请日：2015-11-06
Applicant: Imagination Technologies Limited
Inventor： Senthil Kumar Mani , Srinivas Akella
IPC: G10L19/012 , G10L19/06 , H04M3/00
CPC classification number: G10L19/012 , G10L19/06 , H04M3/002
Abstract: A system for generating comfort noise for a stream of frames carrying an audio signal includes frame characterizing logic configured to generate a set of filter parameters characterising the frequency content of a frame; an analysis filter adapted using the filter parameters and configured to filter the frame so as to generate residual samples; an analysis controller configured to cause the residual samples to be stored in a store responsive to receiving an indication that the frame does not comprise speech; and a synthesis controller operable to select stored residual samples from the store and cause a synthesis filter, inverse to the analysis filter and adapted using filter parameters generated by the frame characterizing logic for one or more frames not comprising speech, to filter the selected residual samples so as to generate a frame of comfort noise.
Abstract translation: 用于为携带音频信号的帧流生成舒适噪声的系统包括被配置为生成表征帧的频率内容的一组滤波器参数的帧表征逻辑; 分析滤波器，其使用所述滤波器参数并被配置为对所述帧进行滤波以产生残余样本; 分析控制器，其被配置为响应于接收到所述帧不包括语音的指示，使所述残留样本被存储在存储器中; 以及合成控制器，其可操作以从存储中选择存储的残留样本，并产生与分析滤波器相反的合成滤波器，并且使用由帧特征逻辑生成的一个或多个不包括语音的帧的滤波器参数，以对所选择的残留样本进行滤波 以产生舒适噪音的框架。
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公开(公告)号：US20160094718A1
公开(公告)日：2016-03-31
申请号：US14870458
申请日：2015-09-30
Applicant: Imagination Technologies Limited
Inventor： Senthil Kumar Mani , Srinivas Akella , Anupama Ghantasala
IPC: H04M9/08
Abstract: An echo cancellation detector for controlling an acoustic echo canceller that is configured to cancel an echo of a far-end signal in a near-end signal in a telephony system, the echo cancellation detector comprising a comparison generator configured to compare the far-end signal with the near-end signal, a decision unit configured to make a determination about a first acoustic echo canceller based on that comparison and a controller configured to control an operation of a second acoustic echo canceller in dependence on the determination.
Abstract translation: 一种用于控制声学回声消除器的回声消除检测器，其被配置为消除电话系统中的近端信号中的远端信号的回波，所述回声消除检测器包括比较发生器，其被配置为比较远端信号 利用近端信号，决定单元被配置为基于该比较来确定第一声学回声消除器，以及控制器，被配置为根据该确定来控制第二声学回声消除器的操作。
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公开(公告)号：US20190268478A1
公开(公告)日：2019-08-29
申请号：US16410839
申请日：2019-05-13
Applicant: Imagination Technologies Limited
Inventor： Senthil Kumar Mani , Gandhi Namani , Srinivas Akella , Sai Ravi Teja Pulugurtha
Abstract: A gain control system for dynamically tuning an echo canceller, the echo canceller being configured to estimate an echo of a far-end signal and subtract that echo estimate from a microphone signal to output an echo cancelled signal, the gain control system comprising a monitoring unit configured to estimate an energy associated with an impulse response of an adaptive filter configured to generate the echo estimate from the far-end signal and a gain tuner configured to adjust an attenuation of at least one of the microphone signal and the far-end signal in dependence on the estimated energy.
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公开(公告)号：US09692882B2
公开(公告)日：2017-06-27
申请号：US14677693
申请日：2015-04-02
Applicant: Imagination Technologies Limited
Inventor： Senthil Kumar Mani , Gandhi Namani , Srinivas Akella , Sai Ravi Teja Pulugurtha
Abstract: A gain control system for dynamically tuning an echo canceller, the echo canceller being configured to estimate an echo of a far-end signal and subtract that estimate from a microphone signal to output an echo cancelled signal, the system comprising an echo measurement unit configured to calculate a ratio of the microphone signal to the far-end signal, an attenuation unit configured to attenuate at least one of the microphone signal and the far-end signal to output a second microphone signal and a second far-end signal to the echo canceller, the ratio of the second microphone signal to the second far-end signal being different from the calculated ratio, and an attenuation controller configured to control the attenuation unit, in dependence on the calculated ratio, so as to alter the ratio of the second microphone signal to the second far-end signal and control the echo-cancelled signal.
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Patent Agency Ranking
公开(公告)号：US10375251B2
公开(公告)日：2019-08-06
申请号：US15632515
申请日：2017-06-26
Applicant: Imagination Technologies Limited
Inventor： Senthil Kumar Mani , Ghandhi Namani , Srinivas Akella , Sai Ravi Teja Pulugurtha
Abstract: A gain control system for dynamically tuning an echo canceller, the echo canceller being configured to estimate an echo of a far-end signal and subtract that estimate from a microphone signal to output an echo cancelled signal, the system comprising an echo measurement unit configured to calculate a ratio of the microphone signal to the far-end signal, an attenuation unit configured to attenuate at least one of the microphone signal and the far-end signal to output a second microphone signal and a second far-end signal to the echo canceller, the ratio of the second microphone signal to the second far-end signal being different from the calculated ratio, and an attenuation controller configured to control the attenuation unit, in dependence on the calculated ratio, so as to alter the ratio of the second microphone signal to the second far-end signal and control the echo-cancelled signal.
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公开(公告)号：US09706057B2
公开(公告)日：2017-07-11
申请号：US14677745
申请日：2015-04-02
Applicant: Imagination Technologies Limited
Inventor： Senthil Kumar Mani , Gandhi Namani , Srinivas Akella , Sai Ravi Teja Pulugurtha
Abstract: A threshold control system for controlling a non-linear processor in an echo canceller, the non-linear processor being configured to remove any signal energy below a threshold that remains in a microphone signal after the echo canceller has subtracted an echo estimate from it, the threshold control system comprising a convergence unit configured to determine an indication of the stability of an adaptive filter, the adaptive filter being configured to continuously model an echo path so as to generate the echo estimate, and a threshold tuner configured to adjust the threshold of the non-linear processor in dependence on the indication.
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公开(公告)号：US10686942B2
公开(公告)日：2020-06-16
申请号：US16410839
申请日：2019-05-13
Applicant: Imagination Technologies Limited
Inventor： Senthil Kumar Mani , Gandhi Namani , Srinivas Akella , Sai Ravi Teja Pulugurtha
Abstract: A gain control system for dynamically tuning an echo canceller, the echo canceller being configured to estimate an echo of a far-end signal and subtract that echo estimate from a microphone signal to output an echo cancelled signal, the gain control system comprising a monitoring unit configured to estimate an energy associated with an impulse response of an adaptive filter configured to generate the echo estimate from the far-end signal and a gain tuner configured to adjust an attenuation of at least one of the microphone signal and the far-end signal in dependence on the estimated energy.
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公开(公告)号：US10334113B2
公开(公告)日：2019-06-25
申请号：US15617648
申请日：2017-06-08
Applicant: Imagination Technologies Limited
Inventor： Senthil Kumar Mani , Gandhi Namani , Srinivas Akella , Sai Ravi Teja Pulugurtha
Abstract: A gain control system for dynamically tuning an echo canceller, the echo canceller being configured to estimate an echo of a far-end signal and subtract that echo estimate from a microphone signal to output an echo cancelled signal, the gain control system comprising a monitoring unit configured to estimate an energy associated with an impulse response of an adaptive filter configured to generate the echo estimate from the far-end signal and a gain tuner configured to adjust an attenuation of at least one of the microphone signal and the far-end signal in dependence on the estimated energy.
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公开(公告)号：US10297262B2
公开(公告)日：2019-05-21
申请号：US15645296
申请日：2017-07-10
Applicant: Imagination Technologies Limited
Inventor： Senthil Kumar Mani , Srinivas Akella
IPC: H04M3/00 , G10L19/06 , G10L19/012
Abstract: A system for generating comfort noise for a stream of frames carrying an audio signal includes frame characterizing logic configured to generate a set of filter parameters characterising the frequency content of a frame; an analysis filter adapted using the filter parameters and configured to filter the frame so as to generate residual samples; an analysis controller configured to cause the residual samples to be stored in a store responsive to receiving an indication that the frame does not comprise speech; and a synthesis controller operable to select stored residual samples from the store and cause a synthesis filter, inverse to the analysis filter and adapted using filter parameters generated by the frame characterizing logic for one or more frames not comprising speech, to filter the selected residual samples so as to generate a frame of comfort noise.
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