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From: Chuck Simmons
Organization: You jest.
X-Mailer: Mozilla 4.61 [en] (X11; U; Linux 2.0.33 i586)
Subject: Re: Wombat's Revenge
Date: Sun, 19 Jan 2003 21:25:56 GMT
NNTP-Posting-Date: Sun, 19 Jan 2003 13:25:56 PST
> John Larkin wrote:
> >Would some kind soul please explain to me
> >What's the difference between a frequency shifter and a pitch shifter?
> >What are they used for?
> >How do they generally work?
> >Any other fun facts.
> Pitch shifters (usually) work by A/Ding the incoming signal, storing in a dual
> port RAM then reading the data out at a different rate then D/Aing. You will
> immediately see a flaw in this in that if the data is read out faster than it
> is written in, then it will run out of data. Some tricks are used to re read
> certain sections (on a cycle by cycle basis) to fill in the gaps. The first
> units of this type did suffer some quite severe glitching at certain pitch
> changes but the new algorithms are *so* good that it is all but impossible to
> tell the difference. All the ear hears is a change in pitch with no other
> artifacts. Most recent comercial recording have made use of pitch shifters
> somewhere in the chain.
Question about the last sentence. If I go to a live performance, there
is no electronics involved so what I hear is what is played. Why should
a recording of such a performance involve pitch shifting?
... The times have been,
That, when the brains were out,
the man would die. ... Macbeth
Chuck Simmons email@example.com
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