发明名称 |
Echo cancelling device with phase-roll correction |
摘要 |
Echo cancelling above for providing an echo-free incoming data signal with a phase-roll tracking device comprising phase rotating means (58) for rotating the phase of the generated echo signal by a value X which is the estimated phase-roll value, thereby providing a complex phase-roll corrected echo signal a multiplier (124) for multiplying the error signal; between the incoming signal and the real component (112) of the phase-roll corrected echo signal by the imaginary component (120) of the same signal, thereby providing a value Y function of the variation of the phase-roll; a phase-roll variation estimator (128) providing an estimation Z of the phase-roll variation in half duplex mode or in full duplex mode, in response to value Y; and a phase filter (126) providing the estimated phase-roll value X in response to the estimation Z.
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申请公布号 |
US4887258(A) |
申请公布日期 |
1989.12.12 |
申请号 |
US19880164305 |
申请日期 |
1988.03.04 |
申请人 |
INTERNATIONAL BUSINESS MACHINES CORPORATION |
发明人 |
BELLOC, JACQUES;GODARD, DOMINIQUE;MORLEC, EMILE;QUINTIN, MICHEL |
分类号 |
H04L5/14;H04B3/23 |
主分类号 |
H04L5/14 |
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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