Method and apparatus for DTMF detection

Details Method and apparatus for DTMF detection Method and apparatus for DTMF detection

1992-10-14

1994-10-04

Dwyer, James L.

Telephonic communications

Supervisory or control line signaling

Signal receiver

379283, H04M 300

Patent

active

053533453

ABSTRACT:
A DTMF tone is detected through the tracking of two tunable filters HAVING coefficients within so-called tunnels each limited by thresholds derived from the tone frequency components to be detected. In and out-band energies E1(n) and E2(n) are used to further validate tone detection.

REFERENCES:
patent: 4091243 (1978-05-01), Mizrahi
patent: 4534043 (1985-08-01), Krishnan
patent: 4689760 (1987-08-01), Lee et al.
patent: 4782523 (1988-11-01), Galand et al.

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