| 摘要 |
television. SUBSTANCE: invention refers to circuit identifying color rendering system in TV receiver capable of reception of range of TV systems. Circuit identifying color rendering system includes circuit 23 of detection of change of condition of suppression signal that identifies changes for three types of signals of color suppression corresponding to component of signal of color synchronization with phase 90 deg, to component of signal of color synchronization with phase 180 deg and to signal identifying SECAM system, controller 22 of sequence of operations which is controlled by signal from output of circuit 23 of detection of change of condition of suppression signal and which secures fulfillment of correspondingly first, second and third stages in specified order in the course of preset time period, circuits from 29 to 31 of first flip-flop fixing signal of color suppression which is trapped at first stage, circuits 32 and 33 of second flip-flop fixing signal of color suppression which is trapped at second stage and identification decoder for output of signal identifying color rendering system and signal identifying frequency of reference signal of carrier on basis of color suppression signal which is trapped at third stage and of signals from outputs of circuits 29-33 of first and second flip-flops. EFFECT: raised accuracy and speed of identification of received system of color rendering. 7 cl, 8 dwg |
