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Path: utzoo!linus!decvax!microsoft!uw-beaver!cornell!vax135!ariel!hou5f!hou5g!hou5h!eagle!allegra!alice!rabbit!jj
From: jj@rabbit.UUCP
Newsgroups: net.audio
Subject: Re: digital vs analog shootout
Message-ID: <2105@rabbit.UUCP>
Date: Mon, 24-Oct-83 10:48:28 EDT
Article-I.D.: rabbit.2105
Posted: Mon Oct 24 10:48:28 1983
Date-Received: Tue, 25-Oct-83 22:39:06 EDT
References: tpvax.29, <941@utah-gr.UUCP>
Organization: AT&T Bell Laboratories, Murray Hill
Lines: 26


I have to differ with the utah-gr person (I forget the login ID)
about Sony PCM-1 units.  I've used two units, and both had an
SNR of greater than 90dB, except for the area between
17 and 20 kHz, where the anti-aliasing filters were
letting through a bit (70dB worst case at 19.5K or so) of
alaising.  <Lest someone argue that the high frequency dynamic range is
reduced, I will point out that the alaising, as one would expect,
is proportional to the signal, thus having no effect on the
dynamic range of the recorder.  At levels more than
25 dB down from peak, the worst aliasing was below our
instrument resolution and also below the PCM-1's quantizing
level. >

Personally, I would return a unit with only 70dB SNR across it's
entire frequency range.

The opinions in this article do not represent the opinions of
any one or anything other than the author.  They are not to be
considered a review, endorsement, technical evaluation, or
even advice.
-- 
 O   o   From the pyrolagnic keyboard of
   ~              rabbit!jj
 -v-v-
 \^_^/   (pyrolagnic- from pyro<=>fire and lagnic<=>eating.)