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    • 3. 发明授权
    • Coding system for pay television
    • 付费电视编码系统
    • US4369462A
    • 1983-01-18
    • US178614
    • 1980-08-15
    • Akimori TomizawaHiroshi OsakaRyokichi Kanai
    • Akimori TomizawaHiroshi OsakaRyokichi Kanai
    • H04K1/00H04N7/167H04N7/171H04N7/16H04K1/02
    • H04N7/1675
    • A coding system for use in a television system wherein at least a part of a television signal is inverted by an encoder at a broadcasting station, according to a code signal and the coded television signal is decoded by decoders of specific subscribers to be reproduced on TV sets. The coding system is comprised of a clock oscillation means, a mode generating means for generating signals indicating plural inversion modes, a counter for counting clock signals from the clock oscillation means, a setting means for outputting a predetermined signal based on addresses provided corresponding to the respective inversion modes of the mode generating means and determined by an output from the counter, and a means for inserting the code signal during a vertical blanking period of the television signal. When the output signal of the mode generating means and the output signal of the setting means are in a given relation, the count value of the counter is used as the code signal.
    • 一种用于电视系统的编码系统,其中电视信号的至少一部分由广播电台的编码器根据代码信号反转,编码的电视信号由特定用户的解码器解码以在电视机上再现 套。 编码系统包括时钟振荡装置,用于产生指示多个反转模式的信号的模式产生装置,用于对来自时钟振荡装置的时钟信号进行计数的计数器,用于根据与所述时钟振荡装置相对应的地址输出预定信号的设置装置 模式产生装置的各个反转模式由计数器的输出确定,以及用于在电视信号的垂直消隐期间插入代码信号的装置。 当模式发生装置的输出信号和设定装置的输出信号为给定关系时,计数器的计数值被用作代码信号。