Automatic phase controlling circuit for processing reproduced ch

Details Automatic phase controlling circuit for processing reproduced ch Automatic phase controlling circuit for processing reproduced ch

1992-12-04

1994-08-16

Kostak, Victor R.

Television

Synchronization

Automatic phase or frequency control

348539, H04N 902

Patent

active

053391128

ABSTRACT:
A low range chroma signal reproduced from a recording medium is converted in the frequency by a frequency converter to obtain an original carrier chroma signal, then the carrier chroma signal is passed through a comb filter for removing a crosstalk and is output further through a phase shifting circuit, a burst signal of the phase shifting output is compared in the phase with a reference signal, the phase comparing output is smoothed by a filter, is then fed to a controlling terminal of a variable oscillator to control the oscillating frequency and is fed to a controlling terminal of the above mentioned phase shifting circuit to control the phase shifting amount. In this formation, a sub-APC loop including no comb filter is superimposed on a conventional APC loop and a response can be made until a high frequency. A color irregularity in a high frequency range (high range phase fluctuation of a carrier chroma signal) which has not been able to be removed can be reduced.

REFERENCES:
patent: 3629491 (1971-12-01), Dann et al.
patent: 4009450 (1977-02-01), Holcomb et al.
patent: 4010490 (1977-03-01), Ota
patent: 4023115 (1977-05-01), Nicolas
patent: 4145705 (1979-03-01), Yoshinaka
patent: 4170023 (1979-10-01), Yamakosh et al.
patent: 4178606 (1979-12-01), Hirota
patent: 4631600 (1986-12-01), Fukui
patent: 4684901 (1987-08-01), Kawano
patent: 4758879 (1988-07-01), Matthies
patent: 5083213 (1992-01-01), Yasuda

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