An electrical telephone speech network
作者： Dar Chang Juang
DOI:
关键词: Class 5 telephone switch 、 Telephone line 、 Telephone exchange 、 Electronic engineering 、 Electrical engineering 、 Line card 、 Dual-tone multi-frequency signaling 、 Signal 、 Class 4 telephone switch 、 Pulse dialing 、 Computer science
摘要: An electrical telephone speech network is disclosed in which a bias switching circuit matched with the network. Thus, pulse dialing mode, line voltage drop of loop during "make" status automatically decreased so that signal received by exchange can be more accurate. At same time, DTMF set increased, for purpose providing larger AC dynamic range to enable deliver and operate lower current. Also, owing direct coupling feeding sidetones, subscriber receives least distortion must stable sidetone volume. Further, transmitting receiving amplifiers are serially connected as reduce minimum working current whole As result, properly much current, extension telephones parallelly
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