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Discussion Groups | Echo Cancellation | Locating the echo...
Locating the echo... - Sudarini Pushparajah - Aug 29 13:15:00 2001
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Hi, I am working on a time-domain echo canceller project. I found out that in network echo cancellers, the delay is significant while the active echo path is small (16ms). However, to model the entire echo path (delay + active region) a large number of filter taps is required. I understand that in many applications, the echo path delay is estimated and therfore the active region is identified. This in turn reduces the number of filter taps needed to be updated. Can anyone please tell me how this time-delay is estimated in echo cancellers, how accuratly it is done and where I can get more information on this?. Thanks Sudarini _________________________________________________________________ Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp |
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Re: Locating the echo... - Huo Jiaquan - Aug 30 1:59:00 2001
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"Proportionate normalized least mean square adqaptation in echo canceller" by D. L. Duttweiler, IEEE Trans. Speech Audio Processing, sept 2000 --- Sudarini Pushparajah <> wrote: > Hi, > I am working on a time-domain echo canceller > project. > I found out that in network echo cancellers, the > delay is significant > while the active echo path is small (16ms). However, > to model the > entire echo path (delay + active region) a large > number of filter taps is > required. I understand that in many applications, > the echo path delay is > estimated and therfore the active region is > identified. This in turn > reduces the number of filter taps needed to be > updated. Can anyone please > tell me how this time-delay is estimated in echo > cancellers, how accuratly > it is done and where I can get more information on > this?. > Thanks > Sudarini _________________________________________________________________ > Get your FREE download of MSN Explorer at > http://explorer.msn.com/intl.asp > http://travel.yahoo.com.au - Yahoo! Travel - Got Itchy feet? Get inspired! |
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