Re: [Asterisk-Users] ADPCM 4-bit, 6 kHz

[Steve Underwood]

Why do people get this uncontrollable urge to post, when the don't know 
the correct answer? :-)

Regards,
Steve
Leo Ann Boon wrote:

I think that's the IMA ADCPM format.

Steve Underwood wrote:

Yves Chouinard wrote:

I found some posts regarding this issue dating of September 2003, 
but no
real answer.

The ADPCM format supported by Asterisk (the .vox files) is 4-bit, 8 
kHz. I
need 4-bit, 6 kHz, which is also a widespread Dialogic format, to help
migration.

Is there an existing format/codec for this? If not, can I make myself a
shared object in /usr/lib/asterisk/modules? Is this easy??? :-(
Thanks,

Yves Chouinard
Vox-Tel
 

There is no support for this right now. However, as you say, the 
OKI/Dialogic 24kbps format is very widely used in the IVR business. 
It might be worth having a 6k -> 8K rate converter so the existing 
Dialogic 32kbps code can also work with 24kbps Dialogic files.

P.S. Just saying 4-bit, 8 kHz or 4-bit, 6 kHz is meaningless. There 
are *many* ADPCM formats which fit those descriptions. The format is 
OKI ADPCM. Dialogic originally used OKI's ADPCM chips, although all 
recent cards implement the codec in a programmable DSP.

Regards,
Steve

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