Re: Adjust-Speed CD player??

Article View: rec.audio

Article #1551

#1551

From: Sam Dicker
Date: Fri, 22 Sep 1989 02:06

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In article <12190@ulysses.homer.nj.att.com> ggs@ulysses.homer.nj.att.com (Griff Smith) writes:
>In article <89264.171306P85025@BARILVM.BITNET>, P85025@BARILVM.BITNET (Doron Shikmoni) writes:
>| Others suggested spectrum analysis and FFT to move from time domain
>| to frequency domain and vice versa....
>| ... this process should be made on
>| a "quantum" at a time - it's not a continuous process. You will
>| still have distortion when you connect the reconstructed parts
>| in the time domain...
>| I don't know about tolerance - that is, if you can make this process
>| "good enough" for hi-fi music processing.
>
>It works.  I don't know the details of how it was done, but I have
>heard music reconstructed this way (without time change or pitch
>shift).  It was indistinguishable from the original.

I've heard this done with samples of certain musical instruments
with a *phase vocoder* which incorporates an FFT.
Is an FFT alone adequate for all hi-fi music processing?

Sam Dicker        samd@apple.com        (408) 974-6490 (voicemail)
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<6028@jpl-devvax.JPL.NASA.GOV> <89255.105143P85025@BARILVM.BITNET> <89264.171306P85025@BARILVM.BITNET> <12190@ulysses.homer.nj.att.com>

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Path: arc1-ca.pugleaf.net!utzoo!attcan!uunet!ginosko!gem.mps.ohio-state.edu!apple!samd
From: samd@Apple.COM (Sam Dicker)
Newsgroups: rec.audio,comp.dsp
Subject: Re: Adjust-Speed CD player??
Message-ID: <4291@internal.Apple.COM>
Date: 22 Sep 89 02:06:25 GMT
References: <6028@jpl-devvax.JPL.NASA.GOV> <89255.105143P85025@BARILVM.BITNET> <89264.171306P85025@BARILVM.BITNET> <12190@ulysses.homer.nj.att.com>
Organization: Apple Computer Inc, Cupertino, CA
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