Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!cs.utexas.edu!uunet!mcsun!sunic!draken!d88-jwa
From: d88-jwa@nada.kth.se (Jon W{tte)
Newsgroups: comp.dsp
Subject: Re: Pitch shift / offset and FFT
Message-ID: <1792@draken.nada.kth.se>
Date: 27 Sep 89 11:04:23 GMT
References: <89264.171306P85025@BARILVM.BITNET> <9520001@hpsad.HP.COM> <1787@draken.nada.kth.se> <4384@internal.Apple.COM>
Reply-To: d88-jwa@nada.kth.se (Jon W{tte)
Organization: Royal Institute of Technology, Stockholm, Sweden
Lines: 23

In article <4384@internal.Apple.COM> wass@Apple.COM (Steve Wasserman) writes:

>If you have a 1000 Hz sine wave and an 1100 Hz sine wave, and you ADD
>them, you will not get a 100 Hz harmonic, but rather the two
>frequencies will BEAT together at 100 Hz.  The perceived effect (in
>sound, at least) is a 1050 Hz signal that rapidly gets changes volume.

Okay, I think I messed up. You're right and I confused things a bit...
Isn't it ring modulation that gives you the sums/differences between
the frequencies ?

>certainly be able to hear the two beating.  Accurate tuning of musical
>instruments is possible by listening for this beating against a
>properly-tuned standard.)  Anyway, if you looked at 1000 Hz PLUS 1100

Yeah, I do that all the time... And you hear the beating, although
it gets weaker with increased frequency.

Thanx. I love this group :')

h+@nada.kth.se
-- 
History does not repeat itself, historians merely repeat each other.