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1. 发明专利

JPS6432790A SUBSCRIBER TELEVISION SYSTEM 失效
公开(公告)号：JPS6432790A
公开(公告)日：1989-02-02
申请号：JP16112688
申请日：1988-06-30
申请人： COMMUNICATIONS SATELLITE CORP
发明人： DANIERU RIIBERUMAN
IPC分类号： H04H60/31 , H04N7/16
摘要： PURPOSE: To prevent a program from being viewed free of charge without authority by storing viewing credit corresponding to the viewing time that a subscriber has paid in the storage device of a subscriber device, relating the program to the charge per unit time, and charging the viewing credit according to the viewing of the subscriber. CONSTITUTION: This system includes a memory filling state register 10, update memory logic 12, a nonvolatile storage device 14, and fault mode logic 16. When EEPROMs 18 and 20 are full, an event pulse is generated on a line 22 at a frequency depending upon the cost of a viewed program. Address control logic 24 enables only one of the ROMs 18 and 20 to receive or supply data of lines 40 and 42. When the power source is ON, a counter 32 is set to a maximum count value and the logic 24 generates a clock for decreasing the counter count when the event pulse appears. When the address of the ROM 18 is decreased to '0', '1' substitutes for a memory position. Consequently, update is carried out by subtracting one unit of a paid time.

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