专利汇可以提供Line circuit专利检索,专利查询,专利分析的服务。并且PURPOSE: To form a line circuit where the terminal impedance at the sight from the telephone set side becomes to equivalent a complex impedance suitable for the antisidetone characteristic of the telephone set, by constituting the terminal impedance only with a resistance element.
CONSTITUTION: The incoming signal applied to a terminal 300 of a four-wire input line is applied to a receiver of a telephone set through an adder 305, a buffer amplifier 304, a terminal resistance 303, and a two-wire line of the subscriber's line. A signal 301 of the transmitter of the telephone set is applied to a terminal 310 of a four-wire input line through a subtractor 308 of the two- wire subscriber's line. The subtractor 308 and a filter 307 compensate components of the incoming signal of the four-wire input line which are leaked into the output line. A filter 306 constitutes a feedback circuit from the input line to the subtracting circuit 308 to the input part of the buffer amplifier 304 to form a terminal complex impedance. The filter 306 consists of switched capacitors 403∼405 and an operational amplifier 401 and is charged and discharged periodically by switched capacitors to constitute the complex impedance.
COPYRIGHT: (C)1983,JPO&Japio,下面是Line circuit专利的具体信息内容。
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