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Abstract

Spectrum conservation in encoded color TV signals is disclosed. An encoded color video signal is orthogonally re-encoded to eliminate the high frequency color subcarrier component to enable transmission or recording of the resulting video signal without distortions in the amplitude or phase characteristics of the encoded color chrominance component as might be introduced without re-encoding of the signal. Re-encoding is achieved by orthogonally converting the incoming color video signal at a predetermined rate, and specific embodiments are disclosed for achieving an optimum orthogonal pattern of the color subcarrier information. After transmission or recording, the original high frequency color subcarrier information and picture luminance component is reconstructed in a video memory device. Orthogonal re-encoding is shown to be generally useful for re-encoding color TV signals including providing an orthogonally encoded color slow-scan TV signal without use of intermediate memory devices.

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First Claim