Article View: sci.electronics
Article #17741Re: 3800 Hz notch filter [will] be used on CD masters
From: Adam Quantrill
Date: Fri, 03 Jul 1987 09:49
Date: Fri, 03 Jul 1987 09:49
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In article <1597@ihuxi.ATT.COM> store2@ihuxi.ATT.COM (Kit Kimes) writes:
<In article <67@sdeggo.UUCP>, dave@sdeggo.UUCP (David L. Smith) writes:
<>
<> Instead of messing about with the audio signal, why not just reach in with
<> a soldering iron and clippers and tweak the chip out of the circuit, or
<> make it think that it always has some noise there with a little 3800 HZ
<> oscillator tied to its input. [..]
<>
<Sorry, but the protection circuit will be buried deep in one of the LSI's.
<There will be no way to remove it and even if you could, the notch will
<still be there on the source CD. That is what has everyone so up in arms.
How about frequency-shifting the signal so that the notch is now at 3805Hz?
A .2% speedup isn't subjectively noticeable.
-Adam.
/* If at first it don't compile, kludge, kludge again.*/
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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: arc1-ca.pugleaf.net!utzoo!mnetor!uunet!seismo!mcvax!ukc!stc!root44!miduet!misoft!adam From: adam@gec-mi-at.co.uk (Adam Quantrill) Newsgroups: sci.electronics Subject: Re: 3800 Hz notch filter [will] be used on CD masters Message-ID: <626@gec-mi-at.co.uk> Date: Fri, 3-Jul-87 05:49:49 EDT Article-I.D.: gec-mi-a.626 Posted: Fri Jul 3 05:49:49 1987 Date-Received: Sun, 12-Jul-87 09:20:17 EDT References: <598@neoucom.UUCP> <67@sdeggo.UUCP> <1597@ihuxi.ATT.COM> Sender: news@gec-mi-at.co.uk Reply-To: adam@gec-mi-at.co.uk (Adam Quantrill) Organization: Marconi Instruments Ltd., St. Albans, UK Lines: 17 Keywords: with possible icky results!