Ringing tone signal detecting circuit

Details Ringing tone signal detecting circuit Ringing tone signal detecting circuit

1993-01-26

1995-02-21

Dwyer, James L.

Telephonic communications

Supervisory or control line signaling

Signal reception at substation

379386, 375 94, 327 47, 327 49, H03K 906

Patent

active

053923472

ABSTRACT:
A ringing tone signal detecting circuit detects a ringing tone signal from a received signal of the echo canceler type which is supplied from a subscriber line through a hybrid circuit. The ringing tone signal detecting circuit has a sampler for sampling the received signal at a predetermined sampling frequency, a comparator for comparing an output signal from the sampler with a predetermined threshold value and producing a binary digital signal, a plurality of first through nth delay circuits for delaying the binary digital signal from the comparator for 1 through n sampling times, respectively, and a frequency detector for detecting a ringing tone signal from the binary digital signal from the comparator and output signals from the first through nth delay circuits. The circuit has particular use in detecting the ringing tone signals in the 2B1Q signaling code scheme.

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patent: 5099497 (1992-03-01), Ohno et al.
patent: 5189378 (1993-02-01), Arai

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