| 摘要 |
<p>A color television receiver with luminance (14) and chrominance (16) signal channels includes an automatic kinescope beam current limiter (50), an automatic white level drive control network (65), and an automatic black level bias control network (75). A switching network (S1) is timed to operate such that a control signal developed by the beam current limiter (50) is coupled to the luminance channel (14) during normal picture intervals, but is decoupled from the luminance channel during both white level drive control intervals and black level bias control intervals. The beam limiter control signal is continuously coupled (52) to the chrominance channel (16), independent of the operation of the switching network (S1), to permit chrominance output bias offset errors produced by beam limiter action to be sensed and compensated for by the automatic bias control network.</p> |
