Reproducing apparatus with drop out suppression circuit for audi

Details Reproducing apparatus with drop out suppression circuit for audi Reproducing apparatus with drop out suppression circuit for audi

1974-12-04

1976-11-02

Konick, Bernard

Telegraphy

Systems

Simplex-reversing periodic

360 38, 360 19, H04N 560

Patent

active

039898938

ABSTRACT:
An apparatus for reading a record carrier on which a combined video signal is recorded in a single track, in particular a disc-shaped record carrier on which the signal is recorded in optically coded form. In order to reduce the disturbing effect of dropouts on the eventually obtained sound signal, a portion of the the video signal is subjected to the action of a clamping circuit. Said clamping circuit normally transfers the applied modulated video signal unmodified. During a dropout the modulated video signal consisting of the modulated sound and pilot signal is clamped at its average value by means of said clamping circuit, so that a substantial improvement is obtained in respect of the sound signal. Thus, the length of time of sound signal clamping is minimized and the sound quality is improved.

REFERENCES:
patent: 3309460 (1967-03-01), Rank
patent: 3408457 (1968-10-01), Boylan
patent: 3446914 (1969-05-01), Hodge
patent: 3824620 (1974-07-01), Langer
"Signal processing in the Philips `VLP` system" by den Bussche et al.; Philips Tech. Rev. 33, pp. 181-185; 1973, No. 7.

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