Ringing tone signal detecting circuit

Details Ringing tone signal detecting circuit Ringing tone signal detecting circuit

H - Electricity

04

M

H04M 3/02 (2006.01) H04M 19/04 (2006.01) H04Q 1/50 (2006.01)

Patent

CA 2088629

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.

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