NDLI: Tricolor light-emitting diode dot matrix display system with audio output

Content Provider	IEEE Xplore Digital Library
Author	Pang, G.K.H. Chi-Ho Chan Kwan, T.T.O.
Copyright Year	1972
Abstract	In this paper, a novel tricolor dot matrix display system in which all the light-emitting diodes (LEDs) are modulated and encoded with audio information is presented. The novelty is on the concurrent use of the tricolor LED display for simultaneous visual message display and audio signal transmission in a free-space optical link. This is a new generation of tricolor dot matrix displays where, in addition to the usual function of LED display, they concurrently provide audio broadcasting through the visible light rays transmitted by the display panel or assembly. The system is comprised of a tricolor dot matrix display panel with an interface circuit to a computer, an audio signal transmitter, and a receiver. It also comprises an executive program that runs on the computer for the display control of characters, decorative pattern or messages on the display panel. The receiver is designed to demodulate the optically transmitted audio information, and reproduce the messages with the speaker For modulating emission of the LEDs, an oscillator is used to vary the frequency of on/off periods of the LEDs. The frequency of flicker is high enough to be indistinguishable by human eye and, hence, display appears to be constantly illuminated.
Sponsorship	IEEE Industry Applications Society
Starting Page	534
Ending Page	540
Page Count	7
File Size	293046
File Format	PDF
ISSN	00939994
Volume Number	37
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2001-03-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Light emitting diodes Auditory displays Computer displays Optical receivers Optical transmitters Frequency Optical fiber communication Broadcasting Assembly Circuits
Content Type	Text
Resource Type	Article
Subject	Industrial and Manufacturing Engineering Control and Systems Engineering Electrical and Electronic Engineering

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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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