Communications: electrical – Condition responsive indicating system – With particular coupling link
Patent
1985-04-17
1986-10-14
Crosland, Donnie L.
Communications: electrical
Condition responsive indicating system
With particular coupling link
340566, 367198, 367199, G08B 100, G10K 1100
Patent
active
046175555
ABSTRACT:
A receiver to detect the audio tone emitted by an activated smoke alarm. The receiver employs an electret condenser microphone to monitor ambient sound. The output of the microphone is applied to an active band-pass filter and then to a PLL tone decoder. The PLL is tunable to provide maximum sensitivity to the frequency of the tone. The microphone is the gain controllable element in an AGC system that acts to keep received signals at a constant level. This insures that all devices operate linearly.
REFERENCES:
patent: 3568144 (1971-03-01), Streb
patent: 3701103 (1972-10-01), Padgett et al.
patent: 3806919 (1974-04-01), Comey
patent: 3868639 (1975-02-01), Okada et al.
patent: 4091366 (1978-05-01), Lavallee
patent: 4110725 (1978-08-01), Petrosky
Crosland Donnie L.
Data Distribution Devices, Inc.
Taishoff Howard Alan
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