Kabushiki Kaisha Toshiba

American Television and Communications Corporation

W Sherwood Campbell

Akinori Masuko

Robert M Rast

Hideki Hirosawa

Wataru Kuroiwa

Shouji Uehara

Tsutomu Uekusa

Yasuhiro Muramatsu

Akio Ogawa

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.

Cable television communication system with passive sensor signal path

An external control unit for a CATV system has a CPU and a RAM with many kinds of memory maps. Reference data to be stored in the memory maps is transmitted from a central station. When a subscriber requests the tuning of a TV channel for a pay program to a converter tuner, the CPU in the external control unit can work, using the reference data.

Communication data processing device of cable television system

Growing community of inventors

Littleton, CO, United States of America

W Sherwood Campbell