L+R separation system
AssigneeTektronix, Inc.
InventorLinley F. Gumm
Life of this patent
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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.
Claims3
A separation system for recovering the sum component of a composite stereo signal having a sum component and a suppressed subcarrier difference component comprising:
- means for generating from the composite stereo signal a sampling signal in synchronism with the suppressed subcarrier;
- means for sampling the composite stereo signal with the sampling signal each time the suppressed subcarrier of the difference component is zero to eliminate the difference component, the output of the sampling means containing the sum component;
- and
- means for recovering the sum component from the output of the sampling means.
Dependencies are inferred from the claim text.