Hitachi, Ltd.

Yukihiko Ozaki

Eiji Moro

Takeo Ohkouchi

Susumu Ohtsuka

A video signal processor includes an image quality adjusting device or noise canceling device which responds to at least one noise information item containing a video signal and, preferably, the noise information item and a brightness information item contained in the video signal, to control quality of a displayed video image to provide a high quality video image.

Video signal processing apparatus with image quality adjustment

A video signal processing apparatus with an automatic picture quality control function comprises a reproduction unit for reproducing a video signal from a video signal recording medium, an APL detector and a noise detector for detecting as a DC potential signal two different pieces of information affecting the picture quality contained in the video signal reproduced by the reproduction unit, a DC potential shift circuit for shifting the smaller of the two DC potential signals detected by the detectors in accordance with the reproduction mode of the reproduction apparatus, an input terminal for inputting a variable DC potential, a switching unit for selecting the output of the DC potential shift circuit or the input from the input terminal, and a picture quality control circuit for controlling the picture quality of the video signal reproduced at the reproduction apparatus by the DC potential from the switching unit.

Video signal processing apparatus with automatic picture quality control

A demagnetizing circuit of a home use video tape recorder is controlled by using means such as a control by a microcomputer or the like so as to execute a demagnetizing operation in a desired tape position interval. Further, by properly controlling an onscreen-display on a monitor display screen or a display on a VTR display tube, the operating efficiency is further improved.

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Katsuta, Japan

Yukihiko Ozaki