Method and apparatus for DTMF detection

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

1994-12-13

1998-10-06

Matar, Ahmad F.

Telephonic communications

Call signal generating

379283, 379351, 379386, H04M 150

Patent

active

058189297

ABSTRACT:
The total energy of a signal that has entered from a telephone line is detected before the signal is applied to an AGC circuit. After the signal is applied to the AGC circuit, the energy of a DTMF signal, which comprises one frequency from four high group frequencies and one frequency from four low group frequencies, is detected through a band-elimination filter having a short energy-propagation delay time with respect to pass-band frequencies. By detecting the DTMF signal based upon the detected energies, detection of the DTMF signal can be performed in a short period of time and erroneous detection can be suppressed.

REFERENCES:
patent: 4085295 (1978-04-01), Goto et al.
patent: 4853958 (1989-08-01), Rabipour et al.
patent: 4868872 (1989-09-01), Roberts et al.
patent: 5119322 (1992-06-01), Stroobach
patent: 5214693 (1993-05-01), Chujo
patent: 5392348 (1995-02-01), Park et al.
patent: 5408529 (1995-04-01), Greaves

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