Path: utzoo!attcan!uunet!lll-winken!lll-tis!helios.ee.lbl.gov!pasteur!agate!eos!phil
From: phil@eos.UUCP (Phil Stone)
Newsgroups: comp.sys.amiga
Subject: Re: Sampling at 29KHz
Message-ID: <797@eos.UUCP>
Date: 27 May 88 18:17:48 GMT
References: <2845@polya.STANFORD.EDU> <734@eos.UUCP> <53788@sun.uucp> <5637@cup.portal.com> <765@eos.UUCP> <5912@cup.portal.com>
Reply-To: phil@eos.UUCP (Phil Stone)
Organization: NASA Ames Research Center, Calif.
Lines: 29

Doug Merritt wrote:
>Phil Stone wrote:
>>....Doug Merritt explains some interesting ways of avoiding sampling
>>aliasing using random fluctuations in sampling frequency.... [...]
>>Your suggestions on direct (non-DMA) access of the sound device are,
>>once again, wonderful from a theoretical point of view, but would drain
>>so much CPU time as to make the Amiga difficult to use for other tasks
>
>Totally agree. Do you know whether my idea about doing the same technique
>via DMA (period modulation of another channel) would work?
>

I thought it depended on *random* fluctuations in sampling frequency - 
wouldn't this just introduce a higher-order periodicity?  BTW - sampler
hardware would also have to do this on the input end wouldn't it?
If it *could* be worked out, it might be a great way of doing
hi-fi sampling.

>And while we're asking for 4K by 4K by 24 screens :-) why not ask for a
>44Khz sampling rate, too? Only half kidding. Some day.
>      Doug Merritt        ucbvax!sun.com!cup.portal.com!doug-merritt

Yeah! Presents some interesting possibilities for direct downloading
from compact disks.  C-A has taken the first step in making a quality,
programmable sound device built in to a great computer (Mac sound? Get
serious).  It would be great to see them develop this idea further in
future products.  Can anybody speak for C-A re: their interest in 
improving the sound device?

				Phil