DTMF signal receiving system

Details DTMF signal receiving system DTMF signal receiving system

1994-04-28

1994-11-08

Dwyer, James L.

Telephonic communications

Supervisory or control line signaling

Signal receiver

379388, 379 98, H04M 1100

Patent

active

053634390

ABSTRACT:
The specification describes a system for receiving DTMF signals from the telephone network. The DTMF signals are inputted into a decoding circuit and a detecting circuit. As the detecting circuit is outputting a detection signal, a data requesting circuit provides a plurality of data request signals to the decoding circuit at a given cycle. The decoding circuit outputs decoded data each time when a data request signal is inputted thereinto. A discriminating circuit identifies and selects decoded data having the highest reliability from the plurality of decoded data. An instrument control circuit controls one or more instruments, based on the selected decoded data. Since a plurality of decoded data are obtained for each DTMF signal and a decoded data having the highest reliability is selected from these decoded data, the instrument(s) can be accurately controlled without any malfunction.

REFERENCES:
patent: 4602131 (1986-07-01), Soulliard et al.
patent: 4868872 (1989-09-01), Roberts et al.
patent: 5163084 (1992-11-01), Kim et al.
patent: 5172406 (1992-12-01), Locke
patent: 5186471 (1993-02-01), Vancraeynest et al.

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