Subscriber's terminal circuit
专利汇可以提供Subscriber's terminal circuit专利检索，专利查询，专利分析的服务。并且PURPOSE:To elevate the transmission characteristic and also make the circuit small- sized, by detecting a current by the photocoupler and removing an alternating current by the DC amplifier. CONSTITUTION:In case of a loop start mode, the switch GD is turned off, a ringing signal from the local telephone switch LS is rectified by the diode bridges D0-D3, and after that, it is detected by the photocoupler PC2. Also, in case of a service mode, a sound signal is bypassed by the capacitor C1, DC voltage is generated in the + terminal of the operational amplifier IC, a base current (i) of the transistors Q0, Q1 is controlled by its output, and a shunt current of the loop current of the tip line TIPO and the ring line RINGO is detected by the PC3. Furthermore, in case of a ground start mode, the GD is turned on, a start signal from the LS is detected by the PCO, and when the LS has been started from the subscriber's terminal circuit SUB, the start completion signal is detected by the PC1.，下面是Subscriber's terminal circuit专利的具体信息内容。
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