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Digital TV tri-state delta modulation system for Space Shuttle ku-band downlinkA tri-state delta modulation/demodulation (TSDM) technique which provides for efficient run-length coding of constant-intensity segments of a TV picture is described. Aspects of the hardware implementation of a high-speed TSDM transmitter and receiver for black-and-white TV or field-sequential color or NTSC format color are reviewed. Run-length encoding of the TSDM output can consistently reduce the required channel data rate well below one bit per sample. As compared with a bistate delta modulation system, the present technique eliminates granularity in the reconstructed video without degrading rise or fall times. About 40 chips are used by TSDM when used to handle the luminance information in a color link. A possible overall space and ground functional configuration to accommodate Shuttle digital TV with scrambling for privacy is presented.
Document ID
19840049666
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Udalov, S.
(Axiomatix Los Angeles, CA, United States)
Huth, G. K.
(Axiomatix Los Angeles, CA, United States)
Roberts, D.
(Axiomatix Corp. Los Angeles, CA, United States)
Batson, B. H.
(NASA Johnson Space Center Houston, TX, United States)
Date Acquired
August 12, 2013
Publication Date
January 1, 1982
Subject Category
Space Communications, Spacecraft Communications, Command And Tracking
Accession Number
84A32453
Distribution Limits
Public
Copyright
Other

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