Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1987-12-14
1989-11-21
Griffin, Robert L.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
370 3, 370 4, 455607, 455617, H04B 900
Patent
active
048827703
ABSTRACT:
A wireless optical short-range communication system adapted for use as an intercom system. The system can be used in fast food restaurants and similar commercial institutions. The communication system includes a base station to interconnect via optical communication a group of substantially similar physically spaced-apart, remote units. Each one of the remote units and the base units includes an optical emitter to transmit an optical message-carrying beam to the base station, and an optical receptor to receive an optical message-carrying beam from the base station. The base station includes a receptor for receiving the optical beam transmitted by the optical emitters of all of the remote units, and an optical emitter to relay the received optical beam to the optical receptors of all the remote units. The base station includes a clock arrangement for synchronizing the operation of the system 10 in a time division multiplexing carrier arrangement, by providing individual discrete time slots for the transmission of the signals from the remote units to the base unit, and for the transmission of the signals from the base unit to the remote units. In this regard, the base station and each one of the remote units include an oscillator to modulate the audio frequency on a predetermined subcarrier frequency, and another oscillator to modulate the subcarrier frequency on a predetermined optical infrared carrier frequency. This method of multiplexing a duplex communication system on a single carrier frequency can also be used in a radio frequency system as well as in an optical system.
REFERENCES:
patent: 2153709 (1939-04-01), Bournisien
patent: 4101878 (1978-07-01), Shimizu
patent: 4262362 (1981-04-01), Kiernan et al.
patent: 4330204 (1982-05-01), Dye
patent: 4393515 (1983-07-01), de Neumann
patent: 4402090 (1983-08-01), Gfeller et al.
patent: 4543665 (1985-09-01), Sotelo
patent: 4682323 (1987-07-01), Corfield et al.
Fasen Kenneth
Miyahira Ronald T.
Beek L. Van
Griffin Robert L.
H. M. Electronics, Inc.
Kleinke Bernard L.
LandOfFree
Wireless optical communication system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Wireless optical communication system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Wireless optical communication system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1430354