USR Sportster Voice 33.6 problems...

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Hi!

Mario Becroft wrote:
> While the GSM format seems to produce excellent quality sound, when I
> tried ADPCM recording and playback through the modem, the sound has some
> kind of strange distortion, which is hard to describe. It sounds kind of
> like a the voice is affected by a low buzzing or warbling sound.

Are you sure, that this is not caused by a too low serial speed? This
could be possible.

> Converting ADPCM to or from BASIC or AU formats results in incredible
> crackling and hissing noise, with the original sound barely noticable over
> all the noise. I.e. there definitely is some hint of the original sound,
> but it's incredibly distorted and almost completely covered up by all the
> noise. This problem reminds me of what you get when playing a signed
> sample as unsigned and vice versa, but since I've tried reversing the
> signed/unsigned-ness of the sound without success I figure this is not the
> problem.

I would really appreciate if someone could shed some light on this
problem.

> Converting from ADPCM to BASIC or AU and then back to ADPCM works fine,
> the resultant file sounds exactly as it should.

This is very interesting, but also confusing.

> About the other problems I was experiencing, the handset problem turns out
> to be a fault not caused by vgetty, but rather a problem with the modem.
> So once I get this sound format problem sorted out everything will be
> going nicely.

Fine.

Bye,
Marc
_______________________________________________________________________________
Email: Marc.Eberhard@Poseidon.ThPhy.Uni-Duesseldorf.DE
WWW: http://Poseidon.ThPhy.Uni-Duesseldorf.DE/~marc/
PGP: http://Poseidon.ThPhy.Uni-Duesseldorf.DE/~marc/Marc_PGP.key

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