Selectively callable receiver operated in accordance with tone c

Details Selectively callable receiver operated in accordance with tone c Selectively callable receiver operated in accordance with tone c

1974-08-16

1977-04-19

Safourek, Benedict V.

Communications: electrical

Land vehicle alarms or indicators

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

325466, 340171PF, H04J 312

Patent

active

040191427

ABSTRACT:
The receiver includes a decoder responsive to certain characteristics of a coded signal, such as the frequency of tones, for producing a decoded signal indicative of second characteristics of the coded signal, such as the durations of the tones. A duration detector is responsive to the decoded signal to provide a detected signal having properties indicative of the tone duration. A utilization circuit is coupled to the detector and is operated in accordance with the properties of the detected signal. The utilization circuit may be an annunciator which produces an audible or visual alerting signal, or it may express digital information, or it may be a system which is to be remotely controlled. Such receiver may be one in a system of various groups of receivers which can be contacted simultaneously if desired. Also, the receiver may include audio circuitry to provide a voice message in the presence of a predetermined detected signal, and alerting means to provide an alerting signal in response to a different detected signal.

REFERENCES:
patent: 3577080 (1971-05-01), Cannalte
patent: 3597690 (1971-08-01), Wycoff
patent: 3651413 (1972-03-01), Wycoff
patent: 3670242 (1972-06-01), McGarvey
patent: 3701024 (1972-10-01), Knowles
patent: 3774114 (1973-11-01), Dahlgren
patent: 3803429 (1974-04-01), Wieczorek
patent: 3806938 (1974-04-01), Zegarski et al.
patent: 3864674 (1975-02-01), Worsham et al.
patent: 3868639 (1975-02-01), Okada et al.
patent: 3882466 (1975-05-01), Poorvin

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