tom@petsd.uucp (Thomas Scott) (05/16/89)
I am running the Digital Voice Card (DVC) from Computer Age Ltd on my PC and
need a program or at least some information about how to interpret and generate
the audio data in the format it uses. The format is specified by a mystery
chip (voice processor) that I believe to be manufactured by Toshiba.
Can anyone help?
More information follows:
The DVC is a playback/record system that records audio on hard disk as a bit
stream, using one of the many variants of the Adaptive Delta Modulation (ADM)
technique. The ADM technique produces very compact audio files but is not
very convenient for audio analysis. For analysis, Pulse Code Modulated (PCM)
data is much more convenient. In fact, the DVC takes audio data as PCM
but converts it on board to ADM. There are no part numbers on the
chip or in the documentation.
What I need is an algorithm (especially in the form of a C program) for
converting between the ADM and PCM just as the Voice Processor chip does.
Thanks,
Tom Scott
EMAIL: {uunet!masscomp, rutgers, princeton}!petsd!pecnos!tom
PHONE: 201/758-7257