[Asterisk-Users] sox and wav to gsm conversion quality issue

[Jamie Neil]

Dan wrote:
> Hi,
> 
> I have some voice prompts in WAV format (PCM, 44KHz, 16bit, mono, bitrate
> 705kbps) and I want to convert them in gsm format.
> Using :
> sox file.wav file.gsm
> The result is a gsm sound file which when is played the speed is very very
> low (something like 5-6 times slower).
> Converting first to a 8KHz, 8bit mono wave file, the final gsm file is
> correct, but the quality is far than acceptable.
> The original file is at a very high quality.
> 
> Which is the procedure to obtain the highest quality possible from my
> original wav file?
> 
> Thanks,
> Dan

Sox can convert the bitrate and the format at the same time, which in my 
experience produces pretty good results.

I posted the process that I use to the list a few weeks ago:

http://lists.digium.com/pipermail/asterisk-users/2003-July/016399.html

Regards,

-- 
Jamie Neil <jamie at versado.net>
Versado I.T. Services Ltd.
http://versado.net/