Single frequency detection circuit

Details Single frequency detection circuit Single frequency detection circuit

H - Electricity

04

M

379/13, 379/59

H04M 3/02 (2006.01) H04M 3/22 (2006.01) H04Q 1/446 (2006.01)

Patent

CA 1200939

SINGLE FREQUENCY DETECTION CIRCUIT Abstract of the Disclosure A single frequency tone detection circuit for detecting a signalling tone in the presence of guard (i.e. voice) signals on a telephone line. The circuit utilizes a unique arrangement for separating the tone and voice signals by first rectifying and then filtering the incoming signal to eliminate any fundamental component of the signalling tone. The signals are then separated by low and high-pass filters into d-c and a-c components and after further processing their magnitudes are compared to ascertain whether or not a valid signalling tone is present.

449930

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