System uses digital logic and a voltage-controlled oscillator to obtain appropriate horizontal and vertical sync signals from the sync bursts contained in the original transmitted signal. It is useful in systems that exhibit considerable single amplitude fluctuation

Lipoma, P. C.

Seay, B. P., Jr.

English

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In
April 1970	 Brief 70-10159 
NASA TECH BRIEF 
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 Clearinghouse for Federal Scientific and Technical 
Information, Springfield, Virginia 22151. Requests for individual copies or questions relating to the Tech Brief program may 
be directed to the Technology Utilization Division, NASA, Code UT, Washington, D.C. 20546. 
Burst Synchronization Detection System 
Advance 
The burst synchronization detection system was 
developed for use with long-range, slow-scan televi-
sion units. The detection system separates synchroniz-
ing bursts from the remainder of the incoming signals 
and supplies such bursts to a phase-lock loop, that 
locks a voltage-controlled oscillator in the loop in 
synchronism with the sine wave component of the 
synchronizing bursts. Pulse signals from the oscillator
are supplied to a first-pulse counter to produce hori-
zontal sync pulses with the same repetition rate as the 
sync bursts. The horizontal sync pulses are supplied to 
a second pulse counter to produce vertical sync 
pulses with the same repetition rate as the vertical 
sync intervals in the incoming signal. 
A first comparison circuit compares the horizontal 
sync pulses with the oscillator signal and the incoming 
(continued overleaf) 
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sync bursts to pull the horizontal sync pulses into 
phase with the sync bursts. A second comparison cir-
cuit compares the vertical sync pulses with the 
oscillator signal and the incoming sync bursts to pull 
the vertical sync pulses into phase with the vertical 
sync intervals of the incoming signal. 
A circuit diagram, partly schematic, of the burst 
synchronization detection system is shown in the 
figure. 
This invention is novel in that it uses digital logic in 
conjunction with a voltage-controlled oscillator to 
obtain appropriate horizontal and vertical sync signals 
from the sync bursts contained in the original trans-
mitted signal. It would be useful in a system that 
exhibited considerable single amplitude fluctuation in 
overcoming the limitations of band-pass filtering, i.e., 
long response times. 
Notes: 
I. This invention may be of interest to designers and 
manufacturers of portable and mobile communica-
tion equipment.
2. Requests for further information may be directed 
to:
Technology Utilization Officer 
Manned Spacecraft Center, Code BM7 
Houston, Texas 77058 
Reference: TSP70- 10159 
Patent status: 
This invention is owned by NASA, and a patent ap-

plication has been filed. Royalty-free, nonexclusive

licenses for its commercial use will be granted by

NASA. Inquiries concerning license rights should be

made to NASA, Code GP, Washington, D.C. 20546.

Source: Bryant P. Seay, Jr., NASA/MSC and

Phillip C. Lipoma of
Lockheed Electronics Corporation

under contract to

Manned Spacecraft Center
(MSC-90317) 
Brief 70-10159
	 Category 02


Burst synchronization detection system

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