Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
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
Mitchell, Jr. George H.
Murray Richard
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