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Publication of TW227642BpublicationCriticalpatent/TW227642B/zh
H04N9/73—Colour balance circuits, e.g. white balance circuits or colour temperature control
H—ELECTRICITY
H04—ELECTRIC COMMUNICATION TECHNIQUE
H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
H04N5/00—Details of television systems
H04N5/14—Picture signal circuitry for video frequency region
H04N5/16—Circuitry for reinsertion of DC and slowly varying components of signal; Circuitry for preservation of black or white level
H04N5/165—Circuitry for reinsertion of DC and slowly varying components of signal; Circuitry for preservation of black or white level to maintain the black level constant