>
> At 20:12 05/11/96 +0200, Kalle Pihlajasaari wrote:
> >Does anyone have an idea of the storage requirements for a set of
> >phonemes assuming you have a micro to do some type of compression
> >or whatever.
>
> I think with CELP compression you get "near phone quality" at 9600 bit per
> second, but probably you need some "near DSP" algorithms to decompress it.
> Voice modems use that type of compression.
>

Having played with low bitrate simple encoding schemes, 3Kbits/sec
is intelligable, if lowpassed, and highpassed on record, recording using
the delta of the wave, not the wave it'self.
If you can spare the space trits give you a better sounding output, needing
less filtering.
If you're using a relatively low pitched voice, you can get away with 3Khz
so that's 4.5Kbits/sec or so.
From the depths of my rusty memory I seem to remember a speech chip
with 64 phonemes, let's say they on average last 0.3 seconds, that's about
20 seconds=90kbits = about 10K ram.
It won't fit in a pic, but you may be able to get away with some of the
higher capacity serial flash type devices.
The quality of this may be less than you can put up with, it's understandable
without difficulty, just not very pleasant.

--
Ian Stirling.                        |  http://www.mauve.demon.co.uk/
AKA Caeser, Bolonewbie.              |  With information on the PDA I'm making.