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From: trough@ihuxi.UUCP (Chris Scussel)
Newsgroups: net.audio
Subject: Yet another speaker anomaly
Message-ID: <1192@ihuxi.UUCP>
Date: Fri, 12-Apr-85 09:53:11 EST
Article-I.D.: ihuxi.1192
Posted: Fri Apr 12 09:53:11 1985
Date-Received: Sat, 13-Apr-85 04:26:57 EST
Distribution: net
Organization: AT&T Bell Laboratories
Lines: 12

Here's another speaker anomaly: Doppler shift. A single speaker cone
attempting to reproduce a loud, low tone and a quieter, higher-pitched
tone simultaneously will end up frequency-modulating the high tone with
the low tone. This happens because the large cone excursions caused by
the low frequency tone give the cone enough velocity to audibly shift
the apparent frequency of the high-pitched tone as it is emitted by
the cone. I read about this some years ago and it seems reasonable,
although I've never knowingly heard it. Any comments?

				Chris Scussel
				AT&T Bell Labs
				ihnp4!ihuxi!trough