Phone-line-linked, tone-operated control device

Details Phone-line-linked, tone-operated control device Phone-line-linked, tone-operated control device

1983-06-23

1986-06-24

Dwyer, James L.

179 84VF, 179 611, 179 5R, H04M 1100

Patent

active

045969000

ABSTRACT:
A phone-line-linked, tone-operated control apparatus in accordance with the invention comprises a detecting circuit coupled to a telephone line for detecting at least one predetermined sequence of predetermined tone signals received on the telephone line and for producing a corresponding sequence detection signal. An additional control circuit is responsive to the sequence detection signal for producing a corresponding control signal. Preferably, a break-in prevention circuit prevents access to the control apparatus unless a predetermined access code is first given.

REFERENCES:
patent: 3829616 (1974-08-01), Blouch
patent: 3902016 (1975-08-01), Blouch
patent: 3992587 (1976-11-01), Puckett et al.
patent: 4006316 (1977-02-01), Bolgiano
patent: 4121053 (1978-10-01), Dick
patent: 4491690 (1985-01-01), Daley

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