Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1980-06-24
1982-11-23
Psitos, Aristotelis M.
Facsimile and static presentation processing
Facsimile
Recording apparatus
358167, 358342, H04N 576, H04N 521
Patent
active
043608299
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.
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Herrmann E. P.
Psitos Aristotelis M.
RCA Corporation
Tripoli J. S.
Whitacre E. M.
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