Method and apparatus for adjusting the pitch and timbre of an input signal in a controlled manner
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United States of America Patent
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Oct 19, 1999
Grant Date -
N/A
app pub date -
Jul 28, 1998
filing date -
Jul 28, 1998
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A system and method are disclosed for independently adjusting the pitch and timbre of an input signal within a modified Lent shifter. A method of adjusting the pitch and timbre of an input signal includes receiving an input signal and determining a window length corresponding to the input signal. A finite length spectrally smoothed signal is created from the input signal by synchronously windowing the input signal. The timbre of the finite length spectrally smoothed signal is adjusted thereby creating a finite length timbre adjusted signal. The finite length timbre adjusted signal is recombined at a rate necessary to produce a desired output pitch thereby reducing artifacts introduced by processing the finite length timbre adjusted signal and minimizing latency between receiving the input signal and producing a desired output signal.
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