Apparatus for isolating the voice frequency path from the floating battery feed during signalling
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United States of America Patent
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-
Nov 12, 1985
Grant Date -
N/A
app pub date -
Dec 13, 1982
filing date -
Dec 13, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a floating battery feed circuit, the voice frequency is normally connected on the subscriber loop side of the blocking capacitor which is used to prevent the DC loop current from flowing in the winding of the associated voice frequency transformer. This capacitor adversely offsets the dial pulse signals. An optical isolator is responsive to the answer control signal from a dial pulse originating (DPO) channel unit and provides a control signal to a switching circuit, which connects the voice frequency circuit to the loop during answer periods and disconnects the voice frequency circuit from the loop during dial pulse signaling.
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