发明名称 SCHAKELINRICHTING VOOR HET OMZETTEN VAN DIGI- TALE SIGNALEN IN ANALOGE SIGNALEN EN ANALOGE SIGNALEN IN DIGITALE SIGNALEN.
摘要 Power saving means is shown for use with a converter circuit in a telephone switching installation. The converter circuit comprises an analog-to-digital converter and a digital-to-analog converter. The voltage supply for the converter circuit is switched on only upon the appearance of analog signals to be converted into digital signals or digital signals to be converted into analog signals.
申请公布号 NL7610650(A) 申请公布日期 1977.04.01
申请号 NL19760010650 申请日期 1976.09.24
申请人 SIEMENS AKTIENGESELLSCHAFT TE BERLIJN EN MUENCHEN, BONDSREPUBLIEK DUITSLAND. 发明人
分类号 H04M11/00;H03M1/00;H04B14/00;H04L29/00;H04M1/253;H04M19/08;(IPC1-7):03K13/01 主分类号 H04M11/00
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