发明名称 |
Delbandsekosläckare med användning av optimala vågpaket och korsbandssläckning |
摘要 |
An echo canceller comprising a first wavelet decomposition block for decomposing a reference signal into a plurality of reference wavelet packets; a second wavelet decomposition block for decomposing an echo signal into a plurality of echo signal packets; an adaptive filter bank for receiving and filtering the reference wavelet packets and in response generating a plurality of filtered output packets replicating the echo signal packets; a plurality of subtracters for receiving and subtracting respective ones of the filtered output packets from the echo signal packets and in response generating and applying a plurality of error signals to the adaptive filter bank for modifying the transfer function of the adaptive filter bank; and a wavelet reconstruction block for receiving and reconstructing the error signals to form a residual signal from which the echo signal has been cancelled. Optimum wavelet filters for the best echo cancellation are provided, as are two wavelet echo cancellation structures. |
申请公布号 |
SE9702451(L) |
申请公布日期 |
1997.12.29 |
申请号 |
SE19970002451 |
申请日期 |
1997.06.26 |
申请人 |
MITEL CORP |
发明人 |
WONG KON MAX;JIN QU;WU QIANG;WU PHILLIPPE;REESOR GORDON J |
分类号 |
H04R3/02;H03H17/02;H03H21/00;H04B3/23;H04L27/00;H04M1/60;H04M9/08;(IPC1-7):H04B3/21 |
主分类号 |
H04R3/02 |
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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