Real-time pitch shifting

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2 total messages Started by andrew longhorn Wed, 30 Sep 1992 22:29

#1292

Author: andrew longhorn
Date: Wed, 30 Sep 1992 22:29

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Hi, I have just subscribed here as I am looking for algorithms or even some helpful
pointers on real-time pitch shifting using DSPs.

I having some specialist hardware built for a pet-project I have the input will be
a single guitar string sound wave (from a standard magnetic pickup).

What I need to know is:
- if I sample at x Khz and I may assume the frequency of the note, Is there an
  easy-ish way to bend this to any semi-tone to +/- 1 octave?
- does not knowing the frequency overly complicate the computation? (other than
  waiting for 1 cycle to determine it.
- can any algorithms handle doing this to a single note that varies in pitch over
  time (the result must vary accordingly, i.e. if I shift an A440 down 2 semitones
  then the pitch of the input goes up 2 semitones I get an A440).

Please post or mail ANY helpful hints and/or locations for sources and/or sources
(any language). I am a baby DSP programmer, hints are welcome.

Thank you for your time,
Andrew Longhorn.

Re: Real-time pitch shifting

#1300

Author: John Lazzaro
Date: Thu, 01 Oct 1992 22:28

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In article <1992Sep30.222908.18452@newshost.anu.edu.au> lonachon@mehta.anu.edu.au writes:
>
>Hi, I have just subscribed here as I am looking for algorithms or even some helpful
>pointers on real-time pitch shifting using DSPs.
>

Malcolm Slaney and I wrote a section in the comp.dsp FAQ posting addressing this question.

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