发明名称 |
Subband acoustic echo canceller |
摘要 |
<p>In a subband acoustic echo canceller, FG/BG filters are provided in M ones of N subbands into which the received signal is divided, and adaptive filters are provided in the other remaining subbands. In the respective FG/BG filters, during the detection of a non-double-talk state their transfer logic parts output state signals GD-j, GD-k, ... and their adaptive operation control parts each apply an adaptation condition signal ADP to the adaptive filter in each of the above-mentioned other remaining subbands when a predetermined number or more of the FG/BG filters output the state signals GD-j, GD-k, .... The adaptive filter updates the subband estimated echo path coefficient only when it is supplied with the signal ADP. <IMAGE></p> |
申请公布号 |
EP0769867(A2) |
申请公布日期 |
1997.04.23 |
申请号 |
EP19960116698 |
申请日期 |
1996.10.17 |
申请人 |
NIPPON TELEGRAPH AND TELEPHONE CORPORATION |
发明人 |
HANEDA, YOICHI;MAKINO, SHOJI;NAKAGAWA, AKIRA;SHIMAUCHI, SUEHIRO;KOJIMA, JUNJI |
分类号 |
H03H21/00;H04M1/60;H04B3/23;H04M9/08;(IPC1-7):H04M9/08 |
主分类号 |
H03H21/00 |
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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