Kabushiki Kaisha Toshiba

Yasuhiro Muramatsu

Akinori Masuko

Hideki Hirosawa

Robert M Rast

W Sherwood Campbell

Akio Ogawa

An audio signal processing circuit includes an amplifier having a non-inverted input terminal, an inverted input terminal and an output terminal with an RC active filter connected across the output terminal and the inverted input terminal, means for supplying first and second audio signals to the inverted input terminal of the amplifier through a first input resistor of which one end is connected to the first audio signal input terminal and a second input resistor of which one end is connected to the second audio signal input terminal, respectively, and a grounding resistor connected between the connection node of the first and the second input resistors and a reference potential source.

Audio signal processing circuit

A cable television system includes security means. A security sensor is provided a subscriber's house and when it generates an emergency signal a transmission path is formed by non-active elements from the security sensor to a trunk cable. An external control unit has a checking function of a power supplying state to the security sensor. The external control unit can communicate with a central station with respect to power source conditions of subscribers.

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Saitama, Japan

Yasuhiro Muramatsu