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From: sullivan@harvard.ARPA (John Sullivan)
Newsgroups: net.audio
Subject: Re: Carver CD Player & Technology
Message-ID: <474@harvard.ARPA>
Date: Thu, 14-Mar-85 17:33:03 EST
Article-I.D.: harvard.474
Posted: Thu Mar 14 17:33:03 1985
Date-Received: Sun, 17-Mar-85 01:30:23 EST
References: <14700008@hpfcms.UUCP> <5000001@hplsle.UUCP>
Organization: Aiken Computation Laboratory, Harvard
Lines: 15

> 
> Using 4x oversampling and 16 bit DACs is overkill since there is no
> information available in the LSB's (unless one wants to manufacture it as
> noise somewhere in the system).

You are right about the main reason for oversampling being to reduce the
demands on the analog filter.  But you still should use 16 bit DAC's.
Suppose your input signal is 17,18,17,18,17,18,...
Whether your extra samples inserted before the digital averaging are
0's or repeats of the last sample makes no difference.  You still can
get out a signal 17,17,17,17,18,18,18,18,17,17,17,17,... from this process,
UNLESS you drop the lower two bits, in which case it will look flat.

	John M. Sullivan
	sullivan@harvard