Other possible Echo Cause

Paul paultsai at gmail.com
Mon Dec 15 06:15:54 CET 2008

I have been thinking about the possible causes for the echo bug.  I
have a feeling that it's actually feedback and not an echo.  I think
what's happening is the sound is being picked up by the mic and being
sent to the remote phone for an extra round of fun.

Does anyone know how I would start testing this?  In particular,  I
would like to try the following.

1. Disable the mic totally and raise the handset volume.  I know the
handset volume is set by Control.4 values in gsmhandset.state file.  I
would make some phone calls and have the remote party talk to see if
an echo occurs.  If not echo occurs, well then we know the mic is part
of the cause.

I also know that our telephone systems do not transmit the whole
audible frequency range.  Is there a way to clip the audio from the
mic for phone calls?  I think this would translate to
reduce/elimination of buzz.

Thanks in advance.

Email - paultsai at gmail.com

There were moments when he looked on evil simply as a mode through
which he could realize his conception of the beautiful.
Oscar Wilde - The Picture of Dorian Gray

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