Device for identifying line reversal/ringing signal of a telephone set
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Nov 16, 1999
Grant Date -
N/A
app pub date -
Dec 1, 1997
filing date -
Dec 1, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A device for identifying a line reversal signal and a ringing signal of a telephone set having a built-in ringing detection circuit includes a counter, a comparator and a latch connected with each other in series. The device can determine whether a signal on line is the line reversal signal or the ringing signal of the telephone set without using an installed CPU or a timer thereof, so as to save power and reduce the load of the CPU.
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