> Sort of AM radio quality then.
> 
> Not if he's looking for 22KHz bandwidth.  That's more than
> most people can hear and exceeds even FM quality

The ISDs are lower than AM quality. Depends on the particular
chip, but I don't think, from memory, any sample faster than 8kHz

The only really good IC is the long-obsoleted TMS3477/3478,
which used CVSD. Excellent bandwidth, not quite FM radio but
pretty close. Now that micros have advanced so much I'm trying
to emulate what it does

It is pretty memory-hungry. The 3478 can interface with DRAMs
(eg 4 * 4C1024) to get about 45s playback, although I have them
running with large SRAM and EPROM too. I'd like to do what it
can do with PC RAM or Flash using a PIC

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