I have seen such thing in one of application notes from the Microchip
Regrads
Alexander.

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> Hey you Guys does anyone have a  ADPCM, Mu-law (or A-law for that
> matter...don't care)
> decoder algorithm laying around in the tool box?   I'm trying to do some
> voice synthesis
>  with the PIC.  I can use a PC to convert voice to ADPCM compressed data
> and load it
> into a PIC's memory but I need help with a MPASM decoding algorithm...any
> leads?
> Thanks in advance for your help...gj