Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1983-01-05
1985-11-19
Crosland, Donnie L.
Communications: electrical
Condition responsive indicating system
With particular system function
340531, 340538, 340310R, 455 3, 455 69, 358174, G08B 2300, H04M 1104
Patent
active
045545324
ABSTRACT:
A centralized monitor system can be automatically controlled so that the signal receiving levels in each component of the system can be held at an optimum position even in the presence of noise components, since they are totally free from any failure caused by the noise interference. More particularly, the monitor panel as part of the centralized monitor system collects and displays any alarm information detected by any of the sub units constituting part of the system while using the indoor power line as the data transmission path, enabling the centralized monitor system to generate an alarm upon receipt of such alarm information from the monitor panel, while the automatic receiver gain controller, in responding to an answer back instruction periodically output by the monitor panel, properly controls both the monitor panel and sub units so that both will remain in such positions where their incoming signal levels can be held optimum even under presence of a variety of noise components.
REFERENCES:
patent: 4028628 (1977-06-01), Rao et al.
patent: 4262283 (1981-04-01), Chamberlain et al.
Ise Masahiro
Machino Katsuyuki
Matsubara Toshiyuki
Tanaka Hidehiko
Terasaka Teiji
Crosland Donnie L.
Sharp Kabushiki Kaisha
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