From caret@pyramid.com Fri Jun 25 18:31:03 1993
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From: caret@pyramid.com (Neil Russell)
Message-Id: <9306251629.AA29204@sword.eng.pyramid.com>
Subject: MC68302 & sound
To: riscy@pyramid.com
Date: Fri, 25 Jun 93 9:29:41 PDT
In-Reply-To: <9306240305.AA00861@hprisc-25.cae.wisc.edu>; from "Carlo J. Calica" at Jun 23, 93 10:05 pm
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> > The best I've seen is the Motorola MC68302, which has 3 serial ports
> > capable of some very good speed.  However, this guy may be a little
> > too expensive, since its also has a 68000 CPU core in it.
> > 
> Well if we do use this 'extra' CPU could we use it for something?  Maybe
> sound?  In any case sound is something to think about.  If we do add it
> would it be a simple DAC or something more complicated?  If set up properly,
> the 68000 (or something more specialized) could combine various waves forms
> to two DACs.  That would be all digital and sound better than most anything
> for the PC.

The 68302 is not that likely.  If I remember rightly it will cost most
of $100 (I should check that).

As for sound, I was thinking of that, but something that could be somewhat
useful to the DSP guys.  This would mean at least a 30KHz variable sample
rate DAC with a variable filter;  This is starting to smell of creeping
featurism.

-- 
Neil Russell		(The wizard from OZ)
Pyramid Technology			Email:  caret@pyramid.com
3860 N. First Street			Voice:  (408) 428-7302
San Jose, CA 95134-1702			  FAX:  (408) 428-8845

 
From wolff@dutecai.et.tudelft.nl Fri Jun 25 18:45:08 1993
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From: wolff@dutecai.et.tudelft.nl (Rogier Wolff)
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To: caret@pyramid.com, riscy@pyramid.com
Subject: Re:  MC68302 & sound
Status: RO
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How about the DATEL 305 for a AD converter? It costs $25 a piece, and will
digitize upto 20M samples per second. With something giving it the right
clock, it off course will also sample audio frequencies.

Pro: 1)"unlimited" bandwidth, 2) cheap.
Con: 1) I don't need AD, 2) Expensive.

DA is usually less expensive. 

I'd pay money for something that would "out-of-the-box" be able to digitize
whatever I'd feed it.

Usually AD converters that sample more than 1M samples per second are more 
than $100, what's the trick? The trick is that it contains 3 fourbit AD 
converters. The first one does a course digitization (1 clock), Next
the other two toggle, and take two clocks to determine the lower 4 bits.
Result is that you have a 2.5 clock delay between sample point and
digital result.... This implementation requires only 48 comparators 
and resistors in ladder arrangement, instead of 256.

					Roger.


 
From jeremy@sw.oz.au Mon Jun 28 05:09:37 1993
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From: jeremy@sw.oz.au (Jeremy Fitzhardinge)
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Subject: Re: MC68302 & sound
To: caret@pyramid.com (Neil Russell)
Date: Mon, 28 Jun 1993 13:06:41 +1000 (EST)
Cc: riscy@pyramid.com
In-Reply-To: <9306251629.AA29204@sword.eng.pyramid.com> from "Neil Russell" at Jun 25, 93 09:29:41 am
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Neil Russell bubbles:

> As for sound, I was thinking of that, but something that could be somewhat
> useful to the DSP guys.  This would mean at least a 30KHz variable sample
> rate DAC with a variable filter;  This is starting to smell of creeping
> featurism.

Optional sound would be nice, but only if no sound is zero cost.  I'd still
push for ISA slots for that kind of thing.  How hard can it be -- the Mips
machines have ISA slots.

	J

 
