The telephone line interface circuit which possesses AC and DC line adjustment

摘要

(57) Abstract The interface circuit which is disclosed here is the interface circuit of the telephone line, it possesses with integrated circuit expedient and the telephone line and the change possible coupling means which connect integrated circuit expedient, change possible coupling means are integrated AC of the interface circuit and/or as the adjustment expedient which adjusts DC telephone line quality. This makes maximum voltage the integrated circuit decrease, covers the circuit vis-a-vis high line voltage. The distortion inside the interface circuit is not spread conversely in the telephone line. Furthermore, there is no parallel electric current which leaks.