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Method and apparatus for manipulating pitch and/or duration of a signal

  • US 5,479,564 A
  • Filed: 10/20/1994
  • Issued: 12/26/1995
  • Est. Priority Date: 08/09/1991
  • Status: Expired due to Term
First Claim
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1. A method of manipulating an input signal to obtain an output signal having a different pitch and/or duration than the input signal, the method comprising:

  • positioning a chain of successive overlapping time windows with respect to the input signal, each of the windows, except for a first window in the chain, being positioned by incrementing a position of that window from a corresponding position of a preceding window in the chain by a time interval which is substantially equal to a local pitch period for a portion of the input signal with respect to which that window will be positioned, said incrementing thereby determining where that window is positioned;

    deriving segment signals from the input signal and the windows, each of the segment signals being derived by weighting the input signal as a function of position in a corresponding one of the windows; and

    synthesizing the output signal by chained superposition of the segment signals.

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