Programmable electronic door chime

Details Programmable electronic door chime Programmable electronic door chime

1976-10-01

1978-08-29

Pitts, Harold I.

Communications: electrical

Audible indication

Ultrasonic pest control

340384R, 84 101, G08B 300

Patent

active

041107500

ABSTRACT:
A programmable electronic door chime is disclosed. The door chime includes programming means to select any desired sequence of notes up to a given maximum which are sounded after momentarily closing a normally open push-button switch. The note sequence is truncated when a different normally open push-button switch is momentarily closed so that the particular switch actuating the chimes may be identified by the length of the note sequence. Tone adjustments are provided to vary the frequency, duration and beat of each note to produce a pleasing sound.

REFERENCES:
patent: 3693110 (1972-09-01), Briggs
patent: 3744022 (1973-07-01), Olsen
patent: 3878750 (1975-04-01), Kapps
patent: 3941024 (1976-03-01), Brand
patent: 3999458 (1976-12-01), Suzuki

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