Programmable doorbell control

Details Programmable doorbell control Programmable doorbell control

1991-07-23

1993-05-11

Ng, Jin F.

Communications: electrical

Systems

Plural

340392, 340330, G08B 2700

Patent

active

052105202

ABSTRACT:
A programmable doorbell system includes a battery-powered doorbell control for connection in series with an existing doorbell pushbutton in a residential doorbell circuit. In a first embodiment, the doorbell control has a visual LCD display which can display one of a plurality of messages. A manual switching mechanism is provided for selecting one of the messages for display. By utilizing an internal time of day clock, the residence occupant can program the control for a time interval during which the normal doorbell is disconnected from the doorbell switch. During this time interval, the doorbell control sounds a tone alarm and displays the selected message if the doorbell switch is pressed by a visitor. A second embodiment is disclosed which utilizes a digital record/playback circuit to record an audible announcement by the occupant and store the recorded announcement as digital signals. An audible announcement is generated from the stored digital signals when the doorbell pushbutton is pressed by a visitor.

REFERENCES:
patent: 2343009 (1944-02-01), Hall
patent: 3964058 (1976-05-01), Winston
patent: 4326276 (1982-04-01), Scott, Jr.
patent: 4715060 (1987-12-01), Lipscher et al.
patent: 4868540 (1989-09-01), Housley

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