Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1984-10-04
1987-03-03
Orsino, Jr., Joseph A.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
2410, 340573, H04B 900
Patent
active
046481311
ABSTRACT:
A work helmet for effecting an intercommunication between workers as well as between a central control room and respective workers, especially used for informing each workers of guide information adequate for emergency escape when a disaster occurs is disclosed. To this end, the work helmet includes a light-receiving element for receiving a light signal modulated with the guide information, an earphone for reproducing audibly the guide information, a light emitting element for emitting an outgoing light signal modulated with a speech signal supplied from a microphone, and an oscillator for generating a carrier having a frequency specific to the helmet, on which carrier said speech signal is modulated, so that the outgoing light signal is always modulated by the carrier serving as a helmet identifying signal by means of which the central control room can recognize and identify the worker wearing the helmet.
REFERENCES:
patent: 3098220 (1963-07-01), De Graaf
patent: 3122847 (1964-03-01), Redfield et al.
patent: 3478344 (1969-11-01), Schwitzgebel et al.
patent: 4025194 (1977-05-01), Teppo
patent: 4110741 (1978-08-01), Hubert et al.
patent: 4227577 (1980-10-01), Iida
patent: 4468656 (1984-08-01), Clifford et al.
Katsukawa Hiroyuki
Kawaguchi Toshiyuki
Nakanishi Kazumi
Tanaka Naoki
NGK Insulators Ltd.
Orsino Jr. Joseph A.
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