发明名称 |
Anti-feedback device and anti-feedback method |
摘要 |
An anti-feedback device includes an anti-feedback filter provided in a closed loop. The anti-feedback device down-samples a signal of specific band selected from an output signal of an adaptive target signal transfer system and a signal of the same band selected from an input signal of the transfer system, and a filtering coefficient of the adaptive filter is updated by use of the down-sampled signals. The filter controller controls a filtering characteristic of the anti-feedback filter so that a peak gain of a frequency of an amplitude characteristic within a specific band of a closed loop determined from the filtering coefficient of the adaptive filter is suppressed. Moreover, the filter controller estimates a gain of the closed loop outside the specific band from the amplitude characteristic in the specific band and controls the amount of suppression of the anti-feedback filter outside the band in accordance with a result of estimation. |
申请公布号 |
US8218788(B2) |
申请公布日期 |
2012.07.10 |
申请号 |
US20090645203 |
申请日期 |
2009.12.22 |
申请人 |
OKUMURA HIRAKU;TANAKA HIROBUMI;YAMAHA CORPORATION |
发明人 |
OKUMURA HIRAKU;TANAKA HIROBUMI |
分类号 |
H04B15/00;H04R25/00;H04R27/00 |
主分类号 |
H04B15/00 |
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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