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From: John Woodgate
Subject: Re: Wombat's Revenge
Date: Sun, 19 Jan 2003 21:05:33 +0000
Organization: JMWA Electronics Consultancy
Reply-To: John Woodgate
NNTP-Posting-Date: Sun, 19 Jan 2003 21:17:47 +0000 (UTC)
X-Newsreader: Turnpike (32) Version 4.01 <5Z8C9wtxbnpWyFnyfFzqmVF739>
I read in sci.electronics.design that John Larkin wrote (in ) about 'Wombat's Revenge', on Sun, 19 Jan 2003:
>Would some kind soul please explain to me
>What's the difference between a frequency shifter and a pitch shifter?
A frequency-shifter shifts all frequencies by the same amount, e.g. 5
Hz. A pitch-shifter shift all frequencies in the same ratio, e.g.
multiplying by 1.05946.. to sift up a semitone.
>What are they used for?
Frequency-shifters are used for feedback reduction in sound
reinforcement systems. Pitch shifters are used for artistic effects.
>How do they generally work?
Analogue frequency-shifters use techniques similar to single-sideband
transmission and reception. I'm not sure about analogue pitch-shifters.
Both (indeed, anything not thermodynamically barred) can be done with
DSP, given enough money and software skill (maybe you need latency as
well, to do non-causal things!). A friend of mine is making a product
(not a shifter) with 10 DSP chips in it. The mind boggles.
We really DO need to know what CGG's box was; frequency or pitch.
Phyllis Alison may be barking mad, but he may be right that it was a
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
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