asterisk users - Aug 2003 - sox and wav to gsm conversion quality issue

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

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@versado.net>
Versado I.T. Services Ltd.
http://versado.net/

> 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
>
Hi Jamie,

If I try like in your example and first resample the original at 8KHz, the
quality of the final sound is unacceptable.

BR,
Dan
> Regards,
>
> -- 
> Jamie Neil <jamie@versado.net>
> Versado I.T. Services Ltd.
> http://versado.net/
>
> _______________________________________________
> Asterisk-Users mailing list
> Asterisk-Users@lists.digium.com
> http://lists.digium.com/mailman/listinfo/asterisk-users
>
>

Ok...some more tests and  the best results I get are with:

sox file.wav -r 8000 file.gsm resample -ql

Now the quality is identical with the original Asterisk prompts.

Thanks for he hint.

Dan

----- Original Message ----- 
From: "Dan" <dtoma@fx.ro>
To: <asterisk-users@lists.digium.com>
Sent: Friday, August 22, 2003 3:02 PM
Subject: Re: [Asterisk-Users] sox and wav to gsm conversion quality issue

> > 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
> >
>
> Hi Jamie,
>
> If I try like in your example and first resample the original at 8KHz, the
> quality of the final sound is unacceptable.
>
> BR,
> Dan
>
> > Regards,
> >
> > -- 
> > Jamie Neil <jamie@versado.net>
> > Versado I.T. Services Ltd.
> > http://versado.net/
> >
> > _______________________________________________
> > Asterisk-Users mailing list
> > Asterisk-Users@lists.digium.com
> > http://lists.digium.com/mailman/listinfo/asterisk-users
> >
> >
>
> _______________________________________________
> Asterisk-Users mailing list
> Asterisk-Users@lists.digium.com
> http://lists.digium.com/mailman/listinfo/asterisk-users
>
>

sox infile.wav -r 8000 -c 1 outfile.gsm


On Fri, 22 Aug 2003, 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
>
> _______________________________________________
> Asterisk-Users mailing list
> Asterisk-Users@lists.digium.com
> http://lists.digium.com/mailman/listinfo/asterisk-users
>

I wanted to know if it is possible to change the contact info so it would be
100@externalip instead that 100@192.168.0.132

If this is possible could you please give me the info.
Thanks,
Best regards,
Yehiel

try adding
fromdomain=externalip

to your sip entries

Martin

On Fri, 22 Aug 2003, Yehiel Samson wrote:
> I wanted to know if it is possible to change the contact info so it would
be
> 100@externalip instead that 100@192.168.0.132
>
> If this is possible could you please give me the info.
> Thanks,
> Best regards,
> Yehiel
>
>
>
> _______________________________________________
> Asterisk-Users mailing list
> Asterisk-Users@lists.digium.com
> http://lists.digium.com/mailman/listinfo/asterisk-users
>