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

[Leo Ann Boon]

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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