Abstract: A sound signal output circuit and method which controls the volume every time a new signal source is selected which has a different modulation degree, than the previous signal source and which prevents sound distortion caused by an over-modulated sound signal input. The circuit detects the peak value of the selected sound signal source, stores the detected peak value, compares the stored peak level with the detected peak level, and thereby selects the greater peak level. Next, the circuit applies the selected peak level to a gain control amplifier as a gain control value, so that when the sound signal source having a different modulation degree is selected, the volume can be automatically controlled.

Abstract: The present invention relates to a television power supply control method and circuit and more particularly to a TV power supply control method and circuit which automatically controls the power supply after a predetermined time period has elapsed after a viewer has left a seat and failed to turn off the power to the television. The television switches to an operation standby mode. There is thus no need to turn off the power every time the viewer leaves the room. Not only is an unnecessary waste of power prevented; also, damage to the TV due to overheating can be avoided.