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Abstract

Apparatus for encoding a continuous (i.e. QAM) signal into a (non-continuous) video signal is achieved in a manner to obviate noise problems normally introduced by breaks in the (video) signal due to horizontal and vertical pulses, low fidelity circuits, timing errors and time shifts. The apparatus employs a circular First-In-First-Out buffer with an address counter. The continuous signal is samples and coded on to a active portion of a video line and an address pointer in the address counter is adjusted back a given number of samples at the end of the video line. On the next video line, that (adjusted) number of samples (from the previous line) are output from the buffer before new data is output. By adjusting the number of samples and adding extra samples to the next video line, noise problems are virtually eliminated.

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First Claim