High voltage detection circuit, bell signal detection circuit an

Details High voltage detection circuit, bell signal detection circuit an High voltage detection circuit, bell signal detection circuit an

1997-07-10

1999-02-23

Zele, Krista

Telephonic communications

Supervisory or control line signaling

Using line or loop condition detection

340660, 340661, H04M 100, G08B 2100

Patent

active

058752455

ABSTRACT:
In a high voltage detection circuit, a high voltage detection portion 10 constituted with, for instance, two constant voltage circuits 10a and 10c and a current mirror portion 10b, a strobe input 20 and an output communication device 30 are provided. This high voltage detection circuit outputs a high voltage detection signal S30 if an input voltage Vin, which is equal to or greater than a voltage value set by the constant voltage circuits 10a and 10c is supplied while a strobe control signal ST is provided. When high voltage detection on telephone lines is performed by such a high voltage detection circuit by inputting the results of the detection of a polarity inversion at telephone lines as a strobe control signal ST, only reception of bell signal can be detected. In addition, by resetting the results of polarity inversion detection using the results of high voltage detection, it is possible to identify a non-ringing reception that is not accompanied by a bell signal.

REFERENCES:
patent: 4406929 (1983-09-01), Pace et al.
patent: 4659944 (1987-04-01), Miller, Sr. et al.
patent: 5202916 (1993-04-01), Oliver
patent: 5636273 (1997-06-01), Schopfer et al.
patent: 5684874 (1997-11-01), Yagyu et al.
patent: 5745563 (1998-04-01), Prentice

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