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Path: utzoo!watmath!clyde!burl!ulysses!harpo!seismo!ut-sally!mordor!sjc
From: sjc@mordor.UUCP
Newsgroups: net.audio
Subject: EQ question
Message-ID: <1624@mordor.UUCP>
Date: Wed, 7-Mar-84 14:27:36 EST
Article-I.D.: mordor.1624
Posted: Wed Mar  7 14:27:36 1984
Date-Received: Thu, 8-Mar-84 08:46:02 EST
Organization: S-1 Project, LLNL
Lines: 12

The question was what the terms "70us" and "120us" mean with regard to tape
recorder equalization.

They are the time constants for two different first-order (e.g. RC) filters.
The equation f = 1 / (2 * pi * t) converts them to frequencies of about 2.27
kHz and 1.33 kHz respectively. Each frequency (often called a "turnover"
frequency) is the 3dB point for the filter response, above which frequency
the response drops (assuming you're talking about playback deemphasis) by
6dB per octave.--Steve

	(S-1 Project, Lawrence Livermore National Laboratory)
	MILNET: sjc@s1-c	UUCP: ...!decvax!decwrl!mordor!sjc