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1. 发明授权

US09461702B2 Systems and methods of echo and noise cancellation in voice communication 有权
公开(公告)号：US09461702B2
公开(公告)日：2016-10-04
申请号：US14739978
申请日：2015-06-15
申请人： Imagination Technologies Limited
发明人： Senthil Mani , Gandhi Namani
IPC分类号： H04B3/23 , H04M3/00 , H04M9/08
CPC分类号： H04B3/23 , H04M3/002 , H04M9/082
摘要： In an example, time and frequency domain speech enhancement is implemented on a platform having a programmable device, such a PC or a smartphone running an OS. Echo cancellation is done first in time domain to cancel a dominant portion of the echo. Residual echo is cancelled jointly with noise reduction during a subsequent frequency domain stage. The time domain block uses a dual band, shorter length Adaptive Filter for faster convergence. Non-linear residual echo is cancelled based on an echo estimate and an error signal from the adaptive filters. A controller locates regions that had residual echo suppressed and which do not have speech and injects comfort noise. The controller can be full-duplex and operate non-linearly. An AGC selectively amplifies the frequency bins, based on the Gain function used by the residual echo and noise canceller.

2. 发明申请

US20150349841A1 Systems and Methods of Echo & Noise Cancellation in Voice Communication 审中-公开
标题翻译：语音通信中回声和噪声消除的系统与方法
公开(公告)号：US20150349841A1
公开(公告)日：2015-12-03
申请号：US14739978
申请日：2015-06-15
申请人： Imagination Technologies Limited
发明人： Senthil Mani , Gandhi Namani
IPC分类号： H04B3/23 , H04M3/00
CPC分类号： H04B3/23 , H04M3/002 , H04M9/082
摘要： In an example, time and frequency domain speech enhancement is implemented on a platform having a programmable device, such a PC or a smartphone running an OS. Echo cancellation is done first in time domain to cancel a dominant portion of the echo. Residual echo is cancelled jointly with noise reduction during a subsequent frequency domain stage. The time domain block uses a dual band, shorter length Adaptive Filter for faster convergence. Non-linear residual echo is cancelled based on an echo estimate and an error signal from the adaptive filters. A controller locates regions that had residual echo suppressed and which do not have speech and injects comfort noise. The controller can be full-duplex and operate non-linearly. An AGC selectively amplifies the frequency bins, based on the Gain function used by the residual echo and noise canceller.
摘要翻译：在一个示例中，时域和频域语音增强在具有可编程设备（诸如运行OS的PC或智能电话）的平台上实现。首先在时域中进行回波消除以消除回声的主要部分。在随后的频域阶段，残留回波与噪声降低联合消除。时域块使用双频段，较短长度的自适应滤波器来实现更快的收敛。基于回波估计和来自自适应滤波器的误差信号来消除非线性残差回波。控制器定位具有残留回波抑制且不具有语音并且注入舒适噪声的区域。控制器可以是全双工的，非线性运行。基于残余回声和噪声消除器使用的增益函数，AGC选择性地放大频率仓。

3. 发明授权

US09088336B2 Systems and methods of echo and noise cancellation in voice communication 有权
标题翻译：语音通信中回波和噪声消除的系统和方法
公开(公告)号：US09088336B2
公开(公告)日：2015-07-21
申请号：US14017860
申请日：2013-09-04
申请人： Imagination Technologies Limited
发明人： Senthil Mani , Gandhi Namani
IPC分类号： H04B3/23 , H04M9/08
CPC分类号： H04B3/23 , H04M3/002 , H04M9/082
摘要： In an example, time and frequency domain speech enhancement is implemented on a platform having a programmable device, such a PC or a smartphone running an OS. Echo cancellation is done first in time domain to cancel a dominant portion of the echo. Residual echo is cancelled jointly with noise reduction during a subsequent frequency domain stage. The time domain block uses a dual band, shorter length Adaptive Filter for faster convergence. Non-linear residual echo is cancelled based on an echo estimate and an error signal from the adaptive filters. A controller locates regions that had residual echo suppressed and which do not have speech and injects comfort noise. The controller can be full-duplex and operate non-linearly. An AGC selectively amplifies the frequency bins, based on the Gain function used by the residual echo and noise canceller.
摘要翻译：在一个示例中，时域和频域语音增强在具有可编程设备（诸如运行OS的PC或智能电话）的平台上实现。首先在时域中进行回波消除以消除回声的主要部分。在随后的频域阶段，残留回波与噪声降低联合消除。时域块使用双频段，较短长度的自适应滤波器来实现更快的收敛。基于回波估计和来自自适应滤波器的误差信号来消除非线性残差回波。控制器定位具有残留回波抑制且不具有语音并且注入舒适噪声的区域。控制器可以是全双工的，非线性运行。基于残余回声和噪声消除器使用的增益函数，AGC选择性地放大频率仓。

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