Path: utzoo!attcan!uunet!munnari.oz.au!metro!cluster!mrj
From: mrj@cs.su.oz (Mark James)
Newsgroups: sci.electronics
Subject: Re: ..but what about _output_ filtering for D/A's?
Message-ID: <1321@cluster.cs.su.oz.au>
Date: 26 Oct 90 04:10:12 GMT
References: <1319@beguine.UUCP> <17660121@hpfcdj.HP.COM>
Sender: news@cluster.cs.su.oz.au
Reply-To: mrj@cs.su.oz (Mark James)
Organization: Basser Dept of Computer Science, University of Sydney, Australia
Lines: 15

In article <17660121@hpfcdj.HP.COM> myers@hpfcdj.HP.COM (Bob Myers) writes:
>Wait just a minute, John.  As SOUND, the answer to this question is *no*.
>You will not, for example, hear a 1000 Hz tone when exposed to *sound sources*
>of, say, 20 kHz and 21 kHz.  The ear doesn't work that way.

The auditory system is able to convert an amplitute modulated tone
to a pitch percept at the modulating frequency.

e.g the combination of a 1.0, 1.1 and 1.2 kHz tone (a 1.1kHz tone amplitude
modulated at 100Hz) has a perceived pitch of 100Hz.  This is not
caused by non-linearity in the cochlear.

This ability falls off somewhat as the component frequencies increase.

Mark