Electronic door announcer

Details Electronic door announcer Electronic door announcer

1975-09-25

1978-02-21

Murray, Richard

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358143, 179 2TV, H04N 718

Patent

active

040756599

ABSTRACT:
Electronic door announcer for apartments of a multi-family dwelling having a community television antenna in which the signals due to sound and video operation of the announcer are carried by at least part of the community antenna coaxial cable system, switching means for the individual apartments being connected into said coaxial cable system.

REFERENCES:
patent: 3105873 (1963-10-01), Winston et al.
patent: 3517120 (1970-06-01), Bunting
patent: 3728493 (1973-04-01), Ter Veen
patent: 3796829 (1974-03-01), Gray
patent: 3806638 (1974-04-01), Camras
patent: 3816662 (1974-06-01), Shaver et al.
patent: 3860746 (1975-01-01), Takeuchi

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