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From: Thomas Wenzel 
Subject: Re: AD516 quality - bullshit
Date: Tue, 29 Apr 97 19:33:00

On 21 Apr 1997 20:35:35 Joern Plewka wrote about "Re: AD516 quality - bullshi":

> Toccata uses a CODEC from AD, which of cause is no high-end.
> You can`t offer high-end with a CODEC.

Correct. Those codecs are designed to offer cheap mixing, sampling
and playing, all in one chip.

But...

1st I must say that the CS4231A sounds surprisingly good for a codec.
2nd it makes no sense to put highend DACs / ADCs on a pic.

> There are frequencies up to 100MHz (68060) but not sine, square in Amiga.

Correct. You can shield it, filter it, but unless you spend _a_lot_ of
effort and money it's still worse than any cheap DAT recorder.

> If you want high-end better take AEB or even the professsional version of
> S/P-DIF and put the analog stuff into external boxes with separate
> power-supply etc.

I'm planning a small version of that. A module that you can plug onto
Prelude's feature bus. It will have S/P-DIF in/out and probably a
samplerate converter.

> you have to select special devices to get no phase-trouble like with
> toccata (removes suround f.e.).

Really? How come? Did they use 40% tolerance capacitors for filtering
or what? I'm getting a damn good phase correlation out of the CS4231A.
No problem when I connect it to a prologic decoder.


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 CU //        | Projects: Play16, AHIRecord, Prelude soundcard   
  \X/, Thomas | Homepage: http://linux.rz.fh-hannover.de/~wenzel/
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