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From: newton2@ucbtopaz.CC.Berkeley.ARPA
Newsgroups: net.audio
Subject: Re: RE:Tape Deck Questions
Message-ID: <592@ucbtopaz.CC.Berkeley.ARPA>
Date: Mon, 29-Oct-84 03:12:27 EST
Article-I.D.: ucbtopaz.592
Posted: Mon Oct 29 03:12:27 1984
Date-Received: Tue, 30-Oct-84 08:13:44 EST
References: <309@whuxl.UUCP>
Organization: Univ. of Calif., Berkeley CA USA
Lines: 18

This refers to Bill Mitchell's remark (dbx greatest thing since sliced
bread) that, while Dolby C reduces cassette noise, dbx makes it completely
inaudible.

	Have you never run across situations wherehigh-level predominantly
low-frequency sounds (tympanni, double bass, who knows what?) expose
the mid- and high-frequency noise by opening the expander? This is a 
question, not sarcasm-- this sort of failure of masking is a well-known
problem with broadband companders; the usual solution is heavy high-freq.
preemphasis (both signal and control path), which can give rise to the
opposite problem (exposure of *low-frequency* noise by isolated hf
signal).

	
	Regards,

		Doug Maisel
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