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From: mccanne@horse.ee.lbl.gov (Steven McCanne)
Newsgroups: comp.dsp
Subject: Echo Cancellation (info request)
Message-ID: <7706@dog.ee.lbl.gov>
Date: 22 Oct 90 19:15:27 GMT
Sender: usenet@dog.ee.lbl.gov
Followup-To: comp.dsp
Organization: Lawrence Berkeley Laboratory, Berkeley
Lines: 18
X-Local-Date: Mon, 22 Oct 90 12:15:27 PDT


I'm interested in experimenting with packetized audio over computer
networks.  I'd like to get a simple prototype running on our
Sparcstations to explore compression techniques and filtering.

Currently, we have simple "walkie talkie" program that does nothing
more than ship raw digitized audio over a UDP socket.  An obvious
problem is the echo caused by the receiver's mic picking up and sending
back its speaker's output.

For a first cut, I'd like to implement some sort of adaptive echo
cancellation, which brings me to my request.  Can anyone point me to
references or implementations (i.e., code) of echo cancellation, or for
that matter, anything at all related to packetized speech/audio?

Thanks.

Steve