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From: c160-3ay@ucbzooey.BERKELEY.EDU (Scrooge)
Newsgroups: net.music.synth
Subject: Re: ircam? Really Adaptive Delta
Message-ID: <11241@ucbvax.BERKELEY.EDU>
Date: Sun, 15-Dec-85 03:47:32 EST
Article-I.D.: ucbvax.11241
Posted: Sun Dec 15 03:47:32 1985
Date-Received: Mon, 16-Dec-85 03:46:54 EST
References: <1652@decwrl.UUCP> <979@cadovax.UUCP> <701@abic.UUCP>
Sender: usenet@ucbvax.BERKELEY.EDU
Reply-To: c160-3ay@ucbzooey.UUCP (Scrooge)
Organization: University of California, Berkeley
Lines: 18
Summary: How could Ad. Del. decrease proc. time?

In article <701@abic.UUCP> mjm@abic.UUCP (Mark Medovich) writes:
>  Adaptive Delta Modulation seems to be a nice idea, but I've found that
>no manufacturer is using this technique with the exception of Delta Lab
>Inc. My impression is that the sample frequency is a function of the slope
>of the input, (and hence, d(-)/dt?).  Can you tell me more?...
>                                              ...I think algorithms of
>this sort will reduce processing time and conserve memory. 

I can see how such a technique would conserve memory, but it seems to me
that if you wanted to manipulate the sampled sound in any way (digital
filtering, pitch change, etc) the algorithms would have to be much more
complicated to deal with this more complex method of storing information.
If the sampling frequency is constant, that's one less thing for the
algorithm to deal with.

			Ranjit Bhatnagar    (PLEASE mail to
Disclaimer: I don't know anything	      ...ucbvax!bugs!ranjit, not
about ad. del. mod.!			      to c160-3ay)