L+R separation system
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United States of America Patent
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-
Aug 18, 1987
Grant Date -
N/A
app pub date -
Jul 28, 1986
filing date -
Jul 28, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An L+R separation system separates the L+R component of a composite stereo signal, such as a BTSC signal or an FM broadcast stereo signal, from the L-R suppressed subcarrier component by sampling the composite stereo signal at a rate which is twice the frequency of the L-R component subcarrier frequency. The sampling signal, which is derived from the composite stereo signal, is synchronized with the subcarrier frequency such that the sampling occurs at the zero crossings of the subcarrier frequency, eliminating the L-R component from the sampled output. A simple lowpass filter recovers the L+R component.
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