Method and apparatus for changing the timbre and/or pitch of audio signals
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United States of America Patent
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Jun 24, 1997
Issued Date -
N/A
app pub date -
Sep 30, 1996
filing date -
Jan 18, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for shifting the timbre and/or pitch of an input signal samples the input signal at a first rate and stores the samples in a memory buffer. A digital signal processor resamples the stored input signal at a rate that differs from the first rate at which the input note is originally sampled and stores the resampled input signal in a second memory buffer. A pitch shifter shifts the pitch of the input signal by periodically scaling the resampled input signal by a window function to create an output signal. The rate at which the resampled data is replicated by the window function determines the pitch of the output signal.
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