Automatic phase adjusting apparatus for television cameras

Details Automatic phase adjusting apparatus for television cameras Automatic phase adjusting apparatus for television cameras

1980-08-21

1982-06-01

Martin, John C.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358149, H04N 946, H04N 504

Patent

active

043331033

ABSTRACT:
An apparatus for automatically adjusting phases of composite synchronizing signals and burst flag signals of a plurality of composite video signals supplied from a plurality of television cameras in order to effect cut-switching, mixing, etc. without a deviation in phase at a video cross point, comprising commonly for the plurality of television cameras a reference signal generator for producing a reference composite synchronizing signal and a reference subcarrier signal, and for each television camera a pair of phase comparators for detecting phase differences between the composite synchronizing signal and burst flag signal at the cross point and the reference composite synchronizing signal and reference subcarrier signal, respectively, a pair of phase shifting circuits for producing composite synchronizing signal and subcarrier signal, respectively having a predetermined phase relationship with respect to the reference signals and a composing circuit for generating a black burst signal including the phase adjusted composite synchronizing signal and the burst flag signal to be supplied to the related television camera.

REFERENCES:
patent: 3420951 (1969-01-01), Gunther
patent: 4173023 (1979-10-01), Lagoni et al.
patent: 4214261 (1980-07-01), Bazin et al.

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