Power saving circuit for use with a converter circuit in a telephone switching installation
AssigneeSiemens Aktiengesellschaft
InventorsFriedemann Vollnhals, Klaus Wintzer
Life of this patent
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Abstract
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.
Claims7
In a telephone switching arrangement having a converter circuit connected to a telephone station of a telecommunications network for converting incoming PCM digital signals into analog signals and for converting outgoing analog signals into PCM digital signals, the improvement comprising:
- a voltage source;
- power switch means connected between said converter circuit and said voltage source for connecting said voltage source to said converter circuit;
- pulse regenerator means triggered by at least one pulse of the incoming PCM digital signals for providing regenerated digital signals to said converter circuit;
- bistable multivibrator means connected to said pulse regenerator means for actuating said power switch means in the event said pulse regenerator means provides regenerated digital signals to said converter circuit;
- and
- sensing means in said telephone station connected to said power switch means for actuating said power switch means in the event said telephone station is in the operating condition.
Dependencies are inferred from the claim text.