| 摘要 |
A chrominance signal circuit in a color television receiver comprises a PAL switch (17) for reversing a subcarrier signal in every second line, which PAL switch is driven responsive to a flip-flop (27) the output of which is reversed for every second line responsive to a horizontal pulse. The burst signal extracted from the received color television signal is reversed for every second line by a switch (21, 22) also responsive to the output of the flip-flop. The reversed burst signal is subjected to phase detection (23) together with a signal obtained by +90 DEG phase shifting (24) the subcarrier. The phase detected output is integrated by an integration circuit (25). The output of the integration circuit is applied to prevent the horizontal pulse (P1') from being applied to the flip-flop as a drive input. |
