Background-picture compensating circuit using on-screen display signals

摘要: A background-picture compensating circuit using an OSD signal for performing a half tone function without requiring includes video processor separating received composite into R, G, B signals, microcomputer muting the outputs of upon receipt character display key input to supply background picture character, and CRT driver amplifying respective signals from or provide amplified cathode CRT, in which supplies pulses high frequency response swiftly repeat On/Off operation output on making level lower than surrounding level, thereby enabling both original covered by simultaneously any additional circuit.