Door answering and intruder alert apparatus and method

Details Door answering and intruder alert apparatus and method Door answering and intruder alert apparatus and method

1989-10-16

1991-05-07

Eisenzopf, Reinhard J.

Communications: electrical

Condition responsive indicating system

Specific condition

340328, G08B 1300

Patent

active

050140396

ABSTRACT:
A self-contained and portable door answering and intruder alert apparatus having a magnetic tape recording device comprised of a highly sensitive microphone receiving circuit for capturing noise generated by a person located at the door of a structure and including a tape cassette operated in a timed sequential manner by an appropriate electronic circuit for transmitting to the person one of a plurality of messages prerecorded on the cassette prior to the unauthorized entry of the structure by the person, the timed sequence being synchronized and the apparatus being switched in order to permit each message to play in its entirety for preventing loss of continuity of each message.

REFERENCES:
patent: 4344071 (1982-08-01), Allen
patent: 4361767 (1982-11-01), Pelka et al.
patent: 4476554 (1984-10-01), Smith et al.
patent: 4544920 (1985-10-01), Hamlin

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