Ring discriminator

Details Ring discriminator Ring discriminator

1994-12-30

1997-03-11

Matar, Ahmad F.

Telephonic communications

Supervisory or control line signaling

Signal reception at substation

379376, 379342, H04M 100

Patent

active

056109784

ABSTRACT:
A ring discriminator comprised of apparatus for receiving an input ringing signal, a counter, apparatus for applying clock pulses to the counter, apparatus for enabling the counter to count clock pulses from a cycle of ringing current, and apparatus for determining a clock pulse count on the counter to distinguish a frequency characteristic of the ringing signal.

REFERENCES:
patent: 4066848 (1978-01-01), Darwood
patent: 4188508 (1980-02-01), Rogers et al.
patent: 4365116 (1982-12-01), Pira et al.
patent: 4496798 (1985-01-01), Colardelle et al.
patent: 4540855 (1985-09-01), Szlam et al.
patent: 4658419 (1987-04-01), Denen

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