Privacy telephone system
专利汇可以提供Privacy telephone system专利检索，专利查询，专利分析的服务。并且PURPOSE:To attain complete privacy telephone even on a line by using a signal in accordance with plural cipher algolisms and confirming the algorithm information (pattern information) at each call connection between a terminal device and a subscriber circuit at exchange side. CONSTITUTION:A call start signal is incoming to a subscriber circuit 3 by calling of a telephone set terminal 1, the telephone algorithm information is transmitted and received between the terminal 1 and th circuit 3, and the algorithm is decided. This algorithm information is released by a restoring signal at end of call. An A/D conversion control section 22 of a telephone set side decides cipher pattern information by transmitting and receiving it with the exchange side. An analog signal of a telephone set and a digital signal of station side are converted according to the algorithm. A D/D conversion control section 32 of the subscriber circuit 3 is provided with a function of conversion between digital signals of line side and network NW side and confirming and deciding the transmission and receiving of the cipher pattern signal. The signal is converted and transmitted/received between the NW and the line side according to the cipher pattern information.，下面是Privacy telephone system专利的具体信息内容。
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