[Asterisk-Users] .gsm voice format

[Scott Stingel]

Ok, thanks.

I should have asked this in the first place: what I'm really getting at is
that I need to record (or convert) prompts in many languages.  I have a
number of Windows based tools to do this.  I want to end up with prompts
that asterisk can play with the least CPU effort, ie. without transcoding.
Would this be the gsm format?  If so, it sounds like I should record in Wav
format, 8-bit samples?  How to convert to gsm?

Thanks again!
Scott

Scott M. Stingel 
Emerging Voice Technology Inc.

Email:          scott at evtmedia.com <mailto:scott at evtmedia.com>   
URL:            www.evtmedia.com <http://www.evtmedia.com>   



> -----Original Message-----
> From: asterisk-users-admin at lists.digium.com 
> [mailto:asterisk-users-admin at lists.digium.com] On Behalf Of 
> Steven Critchfield
> Sent: Monday, July 14, 2003 2:16 PM
> To: asterisk-users at lists.digium.com
> Subject: RE: [Asterisk-Users] .gsm voice format
> 
> 
> Use sox to put it is MSGSM and a RIFF header on it. 
> sox file.gsm -g file.wav
> 
> 
> You need to do this because gsm takes 160 samples and compresses it to
> 32.5 bytes. On unix systems, they let the half byte go to waste. On
> windows they slide a second frame down a half byte and 
> combine it with a
> first frame to put 2 frames into 65 bytes.
> 
> 
> On Mon, 2003-07-14 at 06:45, Scott Stingel wrote:
> > Thanks - do you know the bit rate?
> > 
> > I'm trying to play these prompts with other voice 
> application software, and
> > so far have been unable to.  I've tried: Windows Media 
> player, Vox Studio,
> > Envox prompt editor  - no luck with any of these.
> > 
> > Cheers
> > Scott
> > 
> > Scott M. Stingel 
> > Emerging Voice Technology Inc.
> > 
> > Email:          scott at evtmedia.com <mailto:scott at evtmedia.com>   
> > URL:            www.evtmedia.com <http://www.evtmedia.com>   
> > 
> > 
> > 
> > > -----Original Message-----
> > > From: asterisk-users-admin at lists.digium.com 
> > > [mailto:asterisk-users-admin at lists.digium.com] On Behalf Of 
> > > Sergio Serrano Revuelto
> > > Sent: Monday, July 14, 2003 12:25 PM
> > > To: asterisk-users at lists.digium.com
> > > Subject: RE: [Asterisk-Users] .gsm voice format
> > > 
> > > 
> > > Gsm is wav in 8/mono
> > > 
> > > srsergio
> > > 
> > > 
> > > 
> > > 
> > > -----Mensaje original-----
> > > De: asterisk-users-admin at lists.digium.com
> > > [mailto:asterisk-users-admin at lists.digium.com] En nombre de Scott
> > > Stingel
> > > Enviado el: lunes, 14 de julio de 2003 12:33
> > > Para: asterisk-users at lists.digium.com
> > > Asunto: [Asterisk-Users] .gsm voice format
> > > 
> > > 
> > > Hello-
> > > 
> > > What is the .gsm format?  Ie: what's the encoding method and 
> > > sample rate
> > > please?
> > > 
> > > Thanks
> > > Scott
> > > 
> > > Scott M. Stingel 
> > > Emerging Voice Technology Inc.
> > > Palo Alto, California and London, England
> > > Email:          scott at evtmedia.com  
> > > URL:            www.evtmedia.com  
> > > 
> > > 
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> > > 
> > 
> > 
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> -- 
> Steven Critchfield <critch at basesys.com>
> 
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