Ring detector for telephone line

Details Ring detector for telephone line Ring detector for telephone line

1988-10-28

1990-04-24

Ng, Jin F.

Telephonic communications

Telephone line or system combined with diverse electrical...

Remote indication over telephone line

379 97, 379373, 379382, H04M 100

Patent

active

049205617

ABSTRACT:
The invention provides a low cost ring signal and pulse dial signal detector which can be used in conjunction with a device adapted for carrying out digital communication over a telephone network. The invention comprises a zener diode coupled in series with a snubber circuit that is connected in parallel to the switchhook of the telephone communication device. When the switchhook is open circuited, the zener diode creates high frequency harmonics of any signals on the telephone line such as ring and pulse dial signals. Certain of the harmonics of the ring and pulse dial signals will be within the bandwidth at which the telephone communicating device is tuned to receive communications. Therefore, since the telephone communicating device is already adapted to receive signals at a specified frequency within the communication bandwidth of the telephone network (300-3000 Hz), the addition of the zener diode prvides all of the apparatus necessary to allow for ring and pulse dial signal detection.

REFERENCES:
patent: 4184053 (1980-01-01), Saneyoshi
patent: 4451707 (1984-05-01), Hanscom
patent: 4536619 (1985-08-01), Hamatani et al.

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