Article View: comp.dsp
Article #417Re: Pitch shift / offset and FFT
From: Jon W{tte
Date: Wed, 27 Sep 1989 11:04
Date: Wed, 27 Sep 1989 11:04
23 lines
1494 bytes
1494 bytes
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.
Technical Details
Message-ID:
<1792@draken.nada.kth.se>Path:
arc1-ca.pugleaf.net!utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!cs.utexas.edu!uunet!mcsun!sunic!draken!d88-jwaReferences:
<89264.171306P85025@BARILVM.BITNET> <9520001@hpsad.HP.COM> <1787@draken.nada.kth.se> <4384@internal.Apple.COM>Show Full Headers
Complete Article Headers
Path: arc1-ca.pugleaf.net!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