AUTOMATIC AMPLITUDE LEVEL CONTROL CIRCUIT

摘要: PURPOSE:To improve the accuracy of level adjustment by using a composite signal being sum chroma and pseudo synchronizing having DC component. CONSTITUTION:A C+Hs* C Hs* is branched into two at point A, one fed to input terminal an AGC detection circuit 7 via clamp 6 provided main line 5. The other receives 1H delay element 8 gain loss sent VCA 10 11. uses differential amplifier its output as control apply control.