System with single, standard, wideband line transmits ten or more real time TV video data displays over hard wire to recorders more than 22.5 km from source. Digital logic and integrated circuits ensure high reliability and low maintenance. System is adaptable for video sampling applications

Simpkins, L. G.

English

NASA Technical Reports Server

October 1971	 Brief 71-10391 
NASA TECH BRIEF 
Kennedy Space Center	
-4r 
NASA Tech Briefs announce new technology derived from the U.S. space program. They are issued to encourage 
commercial application. Tech Briefs are available on a aubscription basis from the National Technical Information 
Service, Springfield, Virginia 22151. Requests for individual copies or questions relating to the Tech Brief program may 
be directed to the Technology Utilization Office, NASA, Code KT, Washington, D.C. 20546. 
Television Multiplexing System 
viueo	 I S	 10 Lines 	 Multiplex I Drawer,	 1 Wideband Line 
A novel multiplexing system uses a single, standard, 
wideband line to transmit 10 or more real-time TV 
video data displays over hard wire to recorders at 
a distance of more than 22.5 km from the source. The 
10 Lines
	
	 I	 I TV Video Displays 
Video  
Source ll rnrnrnrni 
system utilizes digital logic and integrated circuits 
to ensure high reliability and low maintenance. 
The system (see fig.) consists of two drawers 
of integrated circuit digital logic units and five video 
disc recorders, each capable of storing two video 
pictures. The digital logic detects picture-update con-
trol pulses from the video generating source and 
adds a digital sync pulse and a digital code to the 
TV video sync pulse. The last video picture updated 
remains "on line" to provide a constant video 
sync pulse for the demultiplexing and video recording 
equipment at the receiving end of the line. 
The use of only one wideband line for transmission 
of the 10 "videos" was made possible by a unique 
method of self-synchronization, combining digital logic 
field and TV concepts. High-speed video switching 
boards are used in conjunction with the digital 
logic. The video disc recorders at the receiving end 
of the transmission line store the video data after 
they are demultiplexed. Video distribution circuitry 
then routes the data to standard 525 TV monitors 
at various locations. 
This system can be adapted for various video samp-
ling applications, including security and surveillance 
monitoring. The system lends itself particularly to 
the long-distance transmission of multiple TV data 
displays where the cost of many lines is prohibitive. 
Note: 
Requests for further information may be directed 
to:
Technology Utilization Officer 
Code AD-PAT 
Kennedy Space Center, Florida 32899 
Reference: B71-10391 
Patent status: 
Inquiries about obtaining rights for the commercial 
use of this invention may be made to: 
Patent Counsel 
Mail Code AD-PAT 
John F. Kennedy Space Center 
Kennedy Space Center, Florida 32899 
Source: L. G. Simpkins
Kennedy Space Center
(KSC- 10654) 
Category 02 
Standard 
TV Monitors 
This documett was prepared under the sponsorship of the National	 Government assumes any liability resulting from the use of the 
Aeronautics and Space Administration. Neither the United States 	 information contained in this document, or warrants that such use 
Government nor any person acting on behalf of the United States 	 will be free from privately ownedrights.
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Television multiplexing system

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