Video signal clipping circuitry and method for color television broadcasting

摘要

Cost effective video clipping circuitry and method achieve lower distortion color television broadcasting. Excess "white" level voltage peaks in otherwise standard (e.g., that of the National Television Standards Committee) color line video signals are clipped by a unique arrangement to prevent over-modulation of an RF broadcast carrier. The circuitry includes amplifier circuitry for substantially amplifying a line video signal above standard levels, diode clipping circuitry for clipping excess white levels from the signal after it has been amplified thereby reducing distortion otherwise caused by an inherent non-linear initial conduction characteristic of the diode clipping circuitry, and attenuator circuitry for attenuating to standard levels the signal after clipping so as to obtain reduced luminance and chrominance distortion.