automatic phase control
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automatic phase control[¦ȯd·ə¦mad·ik ′fāz kən‚trōl]
A circuit used in color television receivers to reinsert a 3.58-megahertz carrier signal with exactly the correct phase and frequency by synchronizing it with the transmitted color-burst signal.
An automatic frequency-control circuit in which the difference between two frequency sources is fed to a phase detector that produces the required control signal.