发明名称 |
Acoustic Echo Preprocessing for Speech Enhancement |
摘要 |
A method for cancelling/reducing acoustic echoes in speech/audio signal enhancement processing comprises selecting a long-term filter based on an echo tail length detection or an echo reverberation time detection of an microphone input signal; a reference signal is pre-processed with the selected long-term filter; the pre-processed reference signal is used to excite an adaptive filter wherein the output of the adaptive filter forms a replica signal of acoustic echo and/or acoustic echo tail; the replica signal of acoustic echo and/or acoustic echo tail is subtracted from a microphone input signal to suppress the acoustic echo and/or acoustic echo tail in the microphone input signal. The echo tail length or the echo reverberation time is detected by analyzing and comparing the microphone input signal and a received signal which is sent to a speaker. A strong long-term filter is selected if the detected echo tail length or the detected echo reverberation time is long; a weak long-term filter is selected if the detected echo tail length or the detected echo reverberation time is not long. |
申请公布号 |
US2015371655(A1) |
申请公布日期 |
2015.12.24 |
申请号 |
US201514740627 |
申请日期 |
2015.06.16 |
申请人 |
Gao Yang |
发明人 |
Gao Yang |
分类号 |
G10L21/0208;G10L21/0224;G10L21/02 |
主分类号 |
G10L21/0208 |
代理机构 |
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代理人 |
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主权项 |
1. A method for cancelling/reducing acoustic echoes in speech/audio signal enhancement processing, the method comprising:
pre-processing a reference signal with a fixed long-term filter; using the pre-processed reference signal to excite an adaptive filter wherein the output of the adaptive filter forms a replica signal of acoustic echo and/or acoustic echo tail; subtracting the replica signal of acoustic echo and/or acoustic echo tail from a microphone input signal to suppress the acoustic echo and/or acoustic echo tail in the microphone input signal. |
地址 |
Mission Viejo CA US |