Other possible Echo Cause

[Lon Lentz]

  Is the echo still an issue when people are using the earbud headphone/mics
that come with the phone?


On Mon, Dec 15, 2008 at 12:15 AM, Paul <paultsai at gmail.com> wrote:

> 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.
>
>
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