Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.1 6/24/83; site mordor.UUCP 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