发明名称 Acoustic identification circuit for dialling signals - has store for number of extensions engaging exchange lines, followed by contact panel and digit reading control device
摘要 <p>The device is for use in centrally controlled telephone PBX's with operator positions, and the dialling signals have one or more digits. The address (number) of the extension requesting and engaging an exchange line is stored in a number and identification store and it is optically displayed at the operator's position as a single or multiple digit number. The store is followed by a contact panel controlling transmission of individual frequencies of a multiple frequency oscillator in accordance with the address content of a number digit, and by a digit control device controlling the sequence of the digit reading out.</p>
申请公布号 DE2731240(A1) 申请公布日期 1979.01.18
申请号 DE19772731240 申请日期 1977.07.11
申请人 SIEMENS AG 发明人 SCHMITZ,RICHARD,ING.
分类号 H04M3/14;H04M3/64;H04M15/34;(IPC1-7):04M3/60 主分类号 H04M3/14
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