Continuous carrier wave generating circuit

Details Continuous carrier wave generating circuit Continuous carrier wave generating circuit

1979-12-14

1982-03-02

Psitos, Aristotelis M.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 18, 360 38, H04N 576, H04N 944, H04N 578

Patent

active

043181198

ABSTRACT:
A generating circuit regenerates a color sub-carrier of a PAL color television system on the basis of a reproduced horizontal sync (synchronizing) pulse and a color burst signal. In order to avoid discontinuity of the regenerated sub-carrier due to signal drop-outs, the reproduced sync pulse is supplied to a counter type automatic frequency control (AFC) circuit which can supply a continuous horizontal frequency signal in spite of drop-outs of the reproduced horizontal sync pulse. When the reproduced burst signal is dropped out, the phase of the sub-carrier signal is changed from one phase to another, for example, from +135.degree. to -135.degree., in order to maintain the swinging conditions of the sub-carrier sequence of the PAL color television system.

REFERENCES:
patent: Re28823 (1976-05-01), Coleman, Jr.
patent: 3974519 (1976-08-01), van den Bussche
patent: 4012774 (1977-03-01), Kuniyoshi et al.
patent: 4024572 (1977-05-01), Derenbecher, Jr.
patent: 4137547 (1979-01-01), Yamamitsu et al.
patent: 4178607 (1979-12-01), Mikado
patent: 4208674 (1980-06-01), Kunihoshi et al.

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