White clip circuit

Abstract

Abstract PURPOSE: To reduce the level difference between the signal level at the start of clip of the white clip circuit limiting the white signal level of video signal and the signal clipped completely. CONSTITUTION: The input signal fed to the input terminal IN' is clamped with the circuit consisting of the capacitor C 11 , and diode D 11 to obtain the signal waveform A' and it is inputted to the base of the transistor Tr 12 constituting the differential amplifier and amplified at the amplifier IC 1 and fed to the emitter of Tr 14 . Since the vase of fixed at the clip potential determined with the variable resistor VR 11 , only when the white level of the signal entering the emitter exceeds the clip potential, the transistor Tr 14 is conductive, and a signal B' appears at the variable resistor VR 12 , it enters the base of the transistor Tr 13 , and the signal during the clip period is cancelled at the output OUT' of the differential amplifier and the signal more than the white signal level limited can not be appeared. COPYRIGHT: (C)1980,JPO&Japio

Inventors

• 👤 Natsuki Nakamura

Bibliographic Details