See the specifications for the Motorola MC3417, MC3418 or MC34115 for a
simple block diagram af an analog version of CVSD. Or here is an
application note with the same information:

http://www.mot-sps.com/lit/html/an1544.html  (About 370K in size).

Many(!) years ago I did an implemention of this using a 6502 series
processor with external ADC and DAC. I was able to record several
seconds of audio as I remember.


-- Rich

Jinx wrote:
>
> Can someone please explain estimate and syllabic integrators. I've
> looked around and keep coming up with the same three very similar
> web pages eg
>
> http://www.users.zetnet.co.uk/ross/radio/iaru-4.htm
>
> I'd like to replace a DSP chip that performs CVSD  (Continuously
> Variable Slope Delta) functions for converting waves to SRAM data.
> The block diagram of the chip's input section shows the 10-bit ADC,
> comparator, estimate integrator, and syllabic integrator. The output
> is an adder + 10-bit DAC
>
> The chip produces a stream of 1-bit differences between samples
> on audio range frequencies at 64k samples/sec. Is it possible to do
> this in s/w (with external ADC/DAC) ? I like what the chip does and
> would want to keep the same specs
>
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