Active distortion elimination circuitry for a video disc player

Details Active distortion elimination circuitry for a video disc player Active distortion elimination circuitry for a video disc player

H - Electricity

04

N

352/18, 352/33.1

H04N 5/76 (2006.01) G11B 17/02 (2006.01) H04N 5/21 (2006.01) H04N 5/931 (2006.01)

Patent

CA 1154155

RCA 74,664 Abstract In a video disc system, the picture display is adversely affected by intermodulation distortion occuring in the signals recovered from the disc record. A non-linear circuit, responsive to a bias signal, generates a compensation signal in a diode modulator for cancelling the undesired distortion components of the recovered signal. The resulting distortion after cancellation is measured in a comparator circuit to determine if the distortion has increased or decreased. The comparator circuitry outputs an appropriate signal to bias the non-linear circuit to further reduce the distortion components. A small oscillation is superimposed on this bias signal, which oscillation simplifies the comparator circuitry and forces the circuit to search for an optimum operating point.

379744

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