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BI-MAGNITUDE PROCESSING FRAMEWORK FOR NONLINEAR ECHO CANCELLATION IN MOBILE DEVICES
BI-MAGNITUDE PROCESSING FRAMEWORK FOR NONLINEAR ECHO CANCELLATION IN MOBILE DEVICES
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机译:移动设备中非线性回波取消的双倍放大处理框架
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摘要
Techniques of performing acoustic echo cancellation involve providing a bi-magnitude filtering operation that performs a first filtering operation when a magnitude of an incoming audio signal to be output from a loudspeaker is less than a specified threshold and a second filtering operation when the magnitude of the incoming audio signal is greater than the threshold. The first filtering operation may take the form of a convolution between the incoming audio signal and a first impulse response function. The second filtering operation may take the form of a convolution between a nonlinear function of the incoming audio signal and a second impulse response function. For such a convolution, the bi-magnitude filtering operation involves providing, as the incoming audio signal, samples of the incoming audio signal over a specified window of time. The first and second impulse response functions may be determined from an input signal input into a microphone.
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