🚀 go-pugleaf

In article <1993Jan25.214046.9622@hplabsz.hpl.hp.com> sivaram@hplabsz.hpl.hp.com (S. Sivaramakrishnan) writes:
>I am looking for a cheap method to record and playback about 15 seconds of
>sound on a chip.
>Sivaram

I would suggest that you look into CVSD chips from Harris.
Motorola may also make such a beast.  Look in the Harris Telecom
products manual.  The CVSD (Continuously Variable Slope DeModulator) chips
convert voice signals into a serial bitstream at a very slow bit rate,
something like 400 bytes/Second if I remember correctly.  The CVSD also
goes the other way, bitstream in, audio out.  The bitstream can be fed
into your favorite micro/memory combination or you could even do it with
a RAM chip and mux/counter hardware if you prefer working in the wire
domain over working in the software domain.  Don't forget to add some
lowpass filters on the audio i/o lines.  Fidelity is not great, but
the memory requirements are minimal.  I always wanted to build an all digital
answering machine with one of those and a simm.

--
 ^   ^  Forrest Cook - < Is that a REAL network or is it a SEARS network? RCD >
/|\ /|\ cook@stout.atd.ucar.edu WB0RIO (This posting is my OPINION)
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