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Path: utzoo!watmath!clyde!burl!ulysses!mhuxl!ihnp4!ihu1g!fish
From: fish@ihu1g.UUCP (Bob Fishell)
Newsgroups: net.audio
Subject: Re: EQ question (partial retraction)
Message-ID: <242@ihu1g.UUCP>
Date: Wed, 7-Mar-84 23:40:50 EST
Article-I.D.: ihu1g.242
Posted: Wed Mar  7 23:40:50 1984
Date-Received: Thu, 8-Mar-84 19:27:52 EST
References: <1534@burdvax.UUCP>, <240@ihu1g.UUCP>, <425@hound.UUCP>
Organization: AT&T Bell Labs, Naperville, IL
Lines: 15

(oo)
Sorry, folks, muffed it again.  FM preemphasis is standardized at 75uS
in this country.  I was wrong about the corner frequency, too; it's
2120 Hz. @+3dB.  Deemphasis is exactly opposite.  120 uS is for ferric
tape;70 uS for chrome and metal, Dolby notwithstanding. 

Just goes to show you what happens to the brains of a former hardware
honcho when they chain you to a terminal and take your soldering iron
away.  Fortunately, I still have a few of my textbooks around; the 
corrected info above is from one of them.  But didn't you like the
pictures?
-- 

                               Bob Fishell
                               ihnp4!ihu1g!fish