发明名称 |
SYSTEM AND METHOD FOR CONTROLLING A FILTER TO ENHANCE SPEAKERPHONE PERFORMANCE |
摘要 |
In a speakerphone system, the signal that is directed to a loudspeaker is filtered by a dynamically controllable highpass filter. The filter characteristics are adjusted on the basis of the power of the signal and the degree of recent microphone activity. The filter ed signal is a far-talker signal, while the microphone activity is represented as a near-talker signal that includes an echo component as a consequence of loudspeaker-to-microphone coupling. The degree of microphone activity is determined by a subband analyzer. A noise floor estimator may be used to determine the degree to which the near-talker signal is comprised of background noise, so that the noise can be eliminated in the process of controlling the highpass filte r
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申请公布号 |
CA2473006(C) |
申请公布日期 |
2009.07.28 |
申请号 |
CA20022473006 |
申请日期 |
2002.12.17 |
申请人 |
SIGNALWORKS, INC. |
发明人 |
LOGAN, TAMARA L.;MCLAUGHLIN, HUGH J.;SCHENCK, JEFF L. |
分类号 |
H04M9/08;H04M1/60 |
主分类号 |
H04M9/08 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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