Oki Semiconductor has been making ADPCM chips for over 20 years. They
were very popular in the telephone industry, although now the
conversion is typically done in software or firmware.
Here's a good link to some Oki circuits: "ADPCM for Highly Intelligible
Speech Synthesis",
http://members.tripod.com/werdav/adpcm.html.
We have some tools available for processing Oki ADPCM (and other
formats) at
www.VFEdit.com.
Posted by
www.AndrewM.com [AMPostID 20050624]
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