Touch tone decoder

Details Touch tone decoder Touch tone decoder

1985-02-01

1986-07-22

Dwyer, James L.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

34082548, 34082574, G06F 1531

Patent

active

046021310

ABSTRACT:
A programmable tone decoder for standard bell system DTMF tone pairs is presented which comprises an integrated DTMF receiver and a means for programming a sequence of digits which are compared to the output of the DTMF receiver. The decoding means provides an output for an exact comparison of the complete sequence, the output being indicative of the reception of a proper telephone code sequence.

REFERENCES:
patent: 4135150 (1979-01-01), Quigley
patent: 4459434 (1984-07-01), Benning et al.

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