Sony Corporation

Ichiro Tsutsui

Junya Saito

Hisafumi Yamada

Takashi Chikuma

A blanking circuit for use in a television receiver designed for video signals of both the HDTV and double-speed scanning NTSC systems comprises a sawtooth generator, a reference voltage generator, a comparator for comparing the sawtooth signal with the reference voltage, a switch for selectively changing the relative level of the reference voltage and the sawtooth signal in conformity with the input broadcasting system, and with the output of the comparator supplied as a blanking pulse to a video signal processor. Due to selective change of the time constant of the sawtooth generator or the change of the threshold level of the reference voltage, a proper blanking pulse can be produced with high precision to prevent losing the image on the monitor CRT screen, and an adequate blanking interval is exactly obtained.

Blanking circuit for television receiver

Ghost cancelling system

A ghost cancelling system having a transversal filter including a weighting circuit and a memory, a power responsive circuit for detecting the time when a power switch is turned on, and an activating circuit connected between the power responsive circuit and the storage capacitor for charging the latter during a predetermined period when the power switch is turned on.

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Tokyo, Japan

Ichiro Tsutsui