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Path: utzoo!utcsrgv!newman
From: newman@utcsrgv.UUCP (Ken Newman)
Newsgroups: net.audio
Subject: Re: Superstition revisited - let's play some math (CD related).
Message-ID: <1905@utcsrgv.UUCP>
Date: Sat, 6-Aug-83 12:52:56 EDT
Article-I.D.: utcsrgv.1905
Posted: Sat Aug  6 12:52:56 1983
Date-Received: Sat, 6-Aug-83 13:33:05 EDT
References: <2116@tekmdp.UUCP>
Organization: CSRG, University of Toronto
Lines: 21


Regarding comment on digital filtering, the Magnavox FD-2000SL
cd player uses this technique. Quotes from July 83 High Fidelity:

"Unlike most of the Japanese units, the Magnavox/Philips
players do not use 16-bit digital-to-analog converters, which
the company believes are not yet good enough for this
application. Instead, they use 14-bit chips, with 4:1 (176.4
kHz) oversampling and digital filtering to achieve a 16-bit
equivalent S/N ratio. This also permits the use of an 
output-smoothing filter with a relatively shallow slope of
18 dB per octave, for better phase response in the audio 
band..."

"Both the square-wave and impulse responses are very good,
undoubtedly because of Magnavox's novel filtering scheme.
Note the perfect symmetry..."

(This player also has superb tracking of defects on test
disks, is the smallest cd player around, and is also the
cheapest at $800 US).