Article View: sci.electronics
Article #17778Re: 3800 Hz notch filter [will] be used on CD masters
From: rbl
Date: Mon, 13 Jul 1987 20:57
Date: Mon, 13 Jul 1987 20:57
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In article <626@gec-mi-at.co.uk> adam@gec-mi-at.co.uk (Adam Quantrill) writes: >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.*/ How about doubling/halving both the CD and the DAT speeds? - rob
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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: arc1-ca.pugleaf.net!utzoo!utgpu!water!watmath!clyde!cbosgd!cwruecmp!nitrex!rbl From: rbl@nitrex.UUCP Newsgroups: sci.electronics Subject: Re: 3800 Hz notch filter [will] be used on CD masters Message-ID: <488@nitrex.UUCP> Date: Mon, 13-Jul-87 16:57:32 EDT Article-I.D.: nitrex.488 Posted: Mon Jul 13 16:57:32 1987 Date-Received: Thu, 16-Jul-87 01:07:25 EDT References: <598@neoucom.UUCP> <67@sdeggo.UUCP> <1597@ihuxi.ATT.COM> <626@gec-mi-at.co.uk> Reply-To: rbl@nitrex.UUCP ( Dr. Robin Lake ) Organization: The Standard Oil Co., Cleveland Lines: 22