Automatic telephone dialer for use in intrusion detection system

Details Automatic telephone dialer for use in intrusion detection system Automatic telephone dialer for use in intrusion detection system

1978-04-10

1979-03-20

Claffy, Kathleen H.

179 90BD, 179 5P, 179 6D, H04M 146, H04M 1104

Patent

active

041455819

ABSTRACT:
An automatic telephone dialer is described which includes a dial tone detection circuit. The dial tone detection circuit responds to a series of tones which are prerecorded on a magnetic tape. The dial tone detection circuit operates to detect the tones and to provide a signal suitable to activate a dialing relay for tone bursts on the tape of a suitable predetermined duration. Upon receipt of a suitable duration tone burst, the tone detection circuit provides an accurate duration signal to provide a relatively identical delay at the beginning and end of a dialing pulse to thereby maintain an accurate dial mark/space ratio determined by the requirements of the telephone line which is accessed by the dialer.

REFERENCES:
patent: 3371163 (1968-02-01), Moseley
patent: 3445601 (1969-05-01), Whitely et al.
patent: 3632879 (1972-01-01), Freisinger
patent: 3703607 (1972-11-01), Cohen
patent: 3790721 (1974-02-01), Muhlbauer
patent: 4032722 (1977-06-01), Connolly et al.
patent: 4079200 (1978-03-01), Meri

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