Ring signal detection circuit

Details Ring signal detection circuit Ring signal detection circuit

1990-08-27

1993-11-02

Callahan, Timothy P.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

328133, 307522, 307525, 377 28, 377107, H03K 906, H03D 300

Patent

active

052587215

ABSTRACT:
A telephone network interface integrated circuit with digitally based loop current detection and digitally based ring signal detection. The ring signal detection includes discrimination with a cutoff frequency of about 13 Hz to distinguish ring signals from dialing signals. The discrimination includes filtration followed by triggering an oscillator for one time period and checking whether the number of oscillations exceeds a threshold.

REFERENCES:
patent: 4047114 (1977-09-01), Lane et al.
patent: 4123704 (1978-10-01), Johnson
patent: 4344038 (1982-08-01), Streeter
patent: 4737984 (1988-04-01), Brown
patent: 4785251 (1988-11-01), Akiyama et al.

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