Time for Two: A Video TDM System that Maintains Spatial and Temporal Resolution for Two Pictures from Different Uplinks

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Publisher: SMPTE
Doc Type: Journal Article
Article Type: research-article
Abstract: As satellite systems grow, the space segment must be increased. Many have tried to overcome their need for additional transponders by utilizing frequency division multiplexing (FDM) of two video signals on the same transponder. This solution, although technically straightforward, reduces the downlink RF power and significantly modifies the operating parameters of the earth stations involved. Time division multiplexing (TDM), on the other hand, eliminates most of the FDM limitations, but in turn adds new requirements. TDM implies that part of the transmission time will be devoted to each of the signals to be transmitted. The question naturally arises: If less than 100% of the transmission time is provided to each picture, how are temporal or spatial losses to be avoided? The T-4–2 process recognizes the fact that in standard television transmission, each television frame is sent twice. Appropriate pre- and post-processing of only one frame will provide two complete frames at the receiving point. This article describes a system that also provides synchronous switching between two separated uplinks, while still maintaining spatial and temporal resolution of the picture.
Publication Date: 1990-03-01
DOI: 10.5594/J03925
Link: https://doi.org/10.5594/J03925
Author(s): Robert J. Butler

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Robert J. Butler; Time for Two: A Video TDM System that Maintains Spatial and Temporal Resolution for Two Pictures from Different Uplinks, SMPTE Journal ( Volume: 99, Issue: 3, March 1990); SMPTE, 1990. Available at https://doi.org/10.5594/J03925

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Robert J. Butler; Time for Two: A Video TDM System that Maintains Spatial and Temporal Resolution for Two Pictures from Different Uplinks, SMPTE Journal ( Volume: 99, Issue: 3, March 1990); SMPTE, 1990. Available at https://doi.org/10.5594/J03925

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<span class="citation">Robert J. Butler; <cite>Time for Two: A Video TDM System that Maintains Spatial and Temporal Resolution for Two Pictures from Different Uplinks</cite>, SMPTE Journal ( Volume: 99, Issue: 3, March 1990); SMPTE, 1990. Available at <a href="https://doi.org/10.5594/J03925" target="_blank" rel="noopener">https://doi.org/10.5594/J03925</a></span>

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<li>
Robert J. Butler; <cite id="bib-10-5594-j03925">Time for Two: A Video TDM System that Maintains Spatial and Temporal Resolution for Two Pictures from Different Uplinks</cite>, SMPTE Journal ( Volume: 99, Issue: 3, March 1990); SMPTE, 1990
<span class="doi">10.5594/J03925</span>
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