System greatly improves signal-to-noise ratio with little or no loss in picture resolution. By storage of luminance component, which is summed with chrominance component, system performs mathematical integration of basically-repetitive television signals. Integration of signals over interval of their repetition causes little change in original signals and eliminates random noise

Gordon, B. L.

Stamps, J. C.

English

NASA Technical Reports Server

December 1973	 .	 B73-10431 
NASA TECH BRIEF 
Lyndon B. Johnson Space Center 
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 subscription 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 Noise-Reduction Device 
S
The problem: 
Color-television video signals transmitted in noisy 
environments produce poor images. Standard filtering 
techniques to reduce the noise content of video signals 
usually lead to loss of picture resolution. 
The solution: 
A new system has been developed for improving the 
signal-to-noise ratio in color-television video signals. 
How it's done: 
The system consists of a luminance-chrominance 
separator, a disk recorder, a summing amplifier, a 
control device, and a processing amplifier, as shown in 
the figure. The system divides the color video signals
into luminance and chrominance components. As the 
chrominance signal is sensitive to time-base instabilities, 
it is not processed and is preserved as is. The sync 
generator strips the synchronizing signals from the video 
input and generates its own synchronizing signals, which 
are applied to the recorder for control of its servo-
mechanism. 
The luminance signal is recorded continually on the 
disk recorder for a total of four recorded television 
frames. The luminance signal then is summed also with 
the previously-recorded luminance signals in the summing 
amplifier and averaged, so that the signal level is the 
same as the original luminance signal. The chrominance 
signal then is added to the, new luminance signal, and 
the result is a noise-reduced television signal. The 
	
Video In	 Comb 
	
f	 Filter
Delay	 I	 Noise-Reduced Video 
H1.1 
rChanne12   
nell I I 	 ________________ 	 Reconstructed 
	
___ _____ 	
Processing	 Video 
l 3	 SummingDisk ne
Linear
Amplifier 
Recorder	 Amplifier
nel 4 	 I	 A 
Chrominance	
1	 liii	
Delay 
Sync	 Sync	
FGenerator
Vertical DriveCon 
Television Noise-Reduction Device
(continued overleaf) 
• 
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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 owned rights.
https://ntrs.nasa.gov/search.jsp?R=19730000431 2020-03-17T07:30:37+00:00Z
processing amplifier then is employed to restore synchro-
nizing signals and reference a 3.58-MHz color sub-
carrier. The controller, which lobtains its reference from 
the sync generator, generates the necessary logic control 
commands to the disk recorder and the weighting 
commands to the summing amplifier. 
The system greatly improves the signal-to-noise ratio 
with little or no loss in picture resolution. By storage of 
the luminance component, which is summed with the 
chrominance component, the system performs mathe-
matical integration of the basically-repetitive television 
signals. This integration of the signals over the interval 
of their repetition causes little change in the original 
signals and eliminates random noise. 
Note: 
Requests for further information may be directed to: 
Technology Utilization Officer 
Johnson Space Center 
Code JM7 
Houston, Texas 77058 
Reference: T5P73-1043 1
Patent status: 
This invention is owned by NASA, and a patent 
application has been filed. Inquiries concerning non-
exclusive or exclusive license for its commercial de-
velopment should be addressed to: 
Patent Counsel 
Johnson Space Center 
Code AM 
Houston, Texas 77058
Source: J. C. Stamps

Johnson Space Center and

B. L. Gordon of 
Taft Broadcasting Corp.

under contract to

Johnson Space Center 
(MSC-12607)
is 
is 
. B73-10431	 Category 02


Television noise-reduction device

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