KOBLING TIL OMSETNING AF DIGITALSIGNALER TIL ANALOGSIGNALER OG TIL OMSETNING AF ANALOGSIGNALER TIL DIGITALSIGNALER

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.