The Variable Speech Control Company ('Vsc')

Michael A Klasco

Irwin H Kornfeld

William G Eppler, Jr

Rex Nathanson

A time compression audio reproduction system has two stereo channels with means for synchronously operating the pitch correction means in each channel to obtain time coincidence between corresponding portions of the signal output from each channel. Features include switching for alternately selecting delay elements.

Stereo reproduction with gapless splicing of pitch altered waveforms

A time compression/expansion system for recorded programs provides time change on playback with pitch correction free of gaps or processing noise due to splicing and discard. A dual memory delay system operated to inversely vary delay is used to provide an interval during which to detect the start of the next program sample with matched signal amplitude and sign. During this interval pitch correction is a continuous extension of the current sample. The system can include individual processing of contiguous frequency bands.

Gapless splicing of pitch altered waveforms

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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New York, NY, United States of America

Michael A Klasco