Configurable parameter DTMF detector

Details Configurable parameter DTMF detector Configurable parameter DTMF detector

1991-01-23

1992-11-10

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

379 98, 379339, H04J 312

Patent

active

051630508

ABSTRACT:
In a digital messaging system (10), an apparatus (37) and method for determining whether a DTMF (Dual Tone Multi Frequency) digit is present on an input signal (11,12). A heuristics engine (37) performs a series of tests on the input signal (11,12) using a set of parameters that are stored in a RAM (38). There is one parameter for each of a set of input signal (11,12) characteristics and for each of a set of operating modes of the digital messaging system (10). All of the parameters are configurable. The configurability allows for the use of non-standard telephone equipment (13,14) and minimizes deleterious effects such as talkoff. The tests are from the set of sets comprising an absolute magnitude test, a frequency deviation test, a twist test, an echo test, a consistency test, and a temporal test.

REFERENCES:
patent: 4748654 (1988-05-01), Gray
patent: 4755985 (1988-07-01), Jayapalan
patent: 4873687 (1989-10-01), Breu
patent: 4996703 (1991-02-01), Gray
patent: 5029199 (1991-07-01), Jones et al.

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