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Method and apparatus for manipulating an input signal to form an output signal having a different length

  • US 5,611,002 A
  • Filed: 08/03/1992
  • Issued: 03/11/1997
  • Est. Priority Date: 08/09/1991
  • Status: Expired due to Term
First Claim
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1. A method for manipulating an input signal having a specific length to form an output signal, said method comprising:

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

    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 so that it has a predetermined length which differs from the specific length of the input signal by chained superposition of a sequence of the segment signals, the sequence being derived from the segment signals by performing at least one of repeating and suppressing one or more of the segment signals.

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