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From: dave@rocksvax.UUCP
Newsgroups: net.audio
Subject: Re: High Frequency sounds being audible
Message-ID: <2000001@rocksvax.UUCP>
Date: Wed, 5-Sep-84 09:51:00 EDT
Article-I.D.: rocksvax.2000001
Posted: Wed Sep  5 09:51:00 1984
Date-Received: Fri, 14-Sep-84 07:21:55 EDT
References: <160@vaxwaller.UUCP>
Lines: 14
Nf-ID: #R:vaxwaller:-16000:rocksvax:2000001:000:618
Nf-From: rocksvax!dave    Sep  5 09:51:00 1984

You would only hear the 1Khz note from the 30 and 31Khz signal if the
signals are applied to a non-linear (mechanical) junction.  Then you will
create the sum and difference intermod products that would produce a
1 Khz tone.  Chances are they created the 1Khz in the radiator that
produced the tones, and if you use a microphone to record what the
person heard, indeed you would pick up a 1Khz tone.  Now on the other
hand if the non-linear mixing joint was in the ear, you probably
would not pick this signal up in a recording.


Dave

arpa: Sewhuk.HENR@Xerox.ARPA
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