04245245 is referenced by 278 patents and cites 10 patents.

A two-way CATV system having a substantial number of terminals incorporates a central processor and transmitter system which continually interrogates the terminals at high speed, monitoring changes of usage of premium programs and other data while also permitting central control of access to restricted premium programs. For inexpensive but reliable intercommunication, short, fixed word length digital messages are frequency multiplexed onto the cable in both upstream and downstream directions, and subscriber groups are controllably selected in turn, with each subscriber being scanned in what may be an arbitrary order by transmission of unique private messages which are recognized at the terminal and in response to which previously prepared fixed length messages are immediately transmitted in return. By employing both upstream and downstream messages which are initiated by a series of synchronizing bits and non-ambiguously related subsequent data sequences, and by the provision of means to initiate both downstream and upstream messages of short length without delay, rapid but reliable data interchange is effected despite differences in transmission and response times with different subscribers. Concurrently, terminal status and various special conditions including security alarms are remotely processed at each terminal, and short upstream messages are assembled containing priority selected data to be transmitted in response to an interrogation. The system incorporates additional means for monitoring power status, program selection and authorization and other operating conditions at each terminal effectively to provide accurate and reliable accounting information while preventing unauthorized or improper usage of restricted premium programs.

Title
Interactive CATV system
Application Number
5/654721
Publication Number
4245245
Application Date
February 2, 1976
Publication Date
January 13, 1981
Inventor
Morihisa Oka
Tokorozawa
JP
Sumitaka Matsumura
Tokorozawa
JP
Takashi Morii
Tokorozawa
JP
Youichiro Tsuda
Tokorozawa
JP
Kuniaki Shiratori
Tokorozawa
JP
Toshihiko Hosaka
Tokorozawa
JP
Shozo Nakamuta
Tokorozawa
JP
Tsutomu Suzuki
Tokorozawa
JP
Saburo Takaoka
Tokorozawa
JP
Tsutomu Fukui
Tokyo
JP
Tsuyoshi Fujiwara
Tokyo
JP
Seiji Hashimoto
Tokyo
JP
Tetuo Kanazashi
Tokyo
JP
Hiroki Uemura
Tokyo
JP
Masaki Saito
Tokyo
JP
Minoru Kosaka
Tokyo
JP
Osamu Tazawa
Tokyo
JP
Yoshifumi Saeki
Tokyo
JP
Katsuaki Matsumoto
Tokyo
JP
Agent
Fraser and Bogucki
Assignee
Pioneer Electronic Corporation
JP
IPC
H04N 7/16
H04N 7/00
H04N 7/16
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