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Path: utzoo!linus!decvax!tektronix!ucbcad!notes
From: notes@ucbcad.UUCP
Newsgroups: net.audio
Subject: Re: Re: Dealer story - (nf)
Message-ID: <260@ucbcad.UUCP>
Date: Sun, 25-Sep-83 06:36:19 EDT
Article-I.D.: ucbcad.260
Posted: Sun Sep 25 06:36:19 1983
Date-Received: Tue, 27-Sep-83 04:18:12 EDT
Sender: notes@ucbcad.UUCP
Organization: UC Berkeley CAD Group
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#R:tesla:-20900:ucbcad:4600001:000:783
ucbcad!max    Sep 24 22:15:00 1983

I didn't see the article that prompted this one, but I thought I'd 
respond to the statement about meters, as it's a little misleading.

Ordinary analog meters can indeed display true peak values. Meters
have dynamics ("inertia"), as do eyes, limiting their response to rapid
events. This can be largely removed with compensation techniques that
drive the meter with a suitably predistorted signal, so the display
responds much faster; I've seen it done. This is a basic application
of classical control theory. Even simpler, an analog meter can be preceded
with a nonlinear peak-following circuit.

My point: it's untrue that meters "can't" display peaks; often they 
don't, but this reflects on the designers of the system, not the display
technology.

		Max Hauser (UC Berkeley)