Time compression/expansion with synchronized individual pitch correction of separate components
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United States of America Patent
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Sep 20, 1983
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N/A
app pub date -
Aug 18, 1980
filing date -
Aug 18, 1980
priority date (Note) -
Expired
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Abstract
A time compression/expansion audio reproduction system of the type that provides pitch correction by repetitive variable time delay achieves improved performance by separating the reproduced signal from a recording into components which are separately delayed. For studio quality reproduction the signal is separated into contiguous frequency bands which are each delayed synchronously and the processing noise in each band is eliminated by filtering each band signal after delay to eliminate high frequency components. Bandpass filtering prior to recombination as well as blanking and amplitude compression and expansion are also disclosed.
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