Dialogic OKI <-> G.726 transcoders

As part of the VMA Global Voice Mail (VPIM) demonstration in Athens for my ex-employer Brite Voice Systems Ltd, I required a transcoder between Dialogic OKI ADPCM and G.726. To achieve a combination of various public domain programs was used.

The two main utilities used were:

• OKI / Linear transcoder found on the Dialogic site
• G.726 / Linear / u-law / a-law transcoder found on the comp.speech site.

Copies of these utilities are available here:

• OKI transcoder in tarred gzip format (5317 bytes)
• OKI transcoder in zip format (7772 bytes)
• G726 transcoder in tarred gzip format (12778 bytes)
• G726 transcoder in zip format (20628 bytes) (12778 bytes)

Note that the Dialogic converter required a small change to prevent distortion of the sound. This is included in the copy present on this site.

Installation

Simply uncompress and untar the archives. Instructions for compiling the packages are included within them (usually just type make). They are known to work under Solaris x86 and linux (intel). I doubt there should be any serious issues about porting these to other platforms.

Usage

G726->raw : decode -l < file.g726 > file.raw

raw->OKI : vox -b 16 file.raw file.oki

OKI->raw : devox -b 16 file.oki file.raw

raw->G726 : encode -l < file.raw > file.g726

For rate conversions and support of other formats, I recommend the use of sox.

Last updated 8th March 1999 by J.A.Carter