Two TV Signals on a 45 Mbit/sec Channel

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Publisher: SMPTE
Doc Type: Journal Article
Article Type: research-article
Abstract: An algorithm and its implementation to transmit two TV signals over a 45 Mbit/sec channel are described. Although the reproduced picture does not show any visible coding degradations for many of the test scenes, a waveform monitor shows that it does not meet current network requirements established for analog signals. Scene adaptive differential pulse-code modulation (DPCM) coding and predictor selection are used with variable word-length coding of the quantized samples. The variable data rate generated by the coder requires buffering to interface to a constant rate channel. Buffer overflow is prevented by controlling coarseness of quantization and by subsampling. An adaptive interpolation scheme is used to reconstruct samples omitted from transmission. Several operating modes are used for best picture reproduction. The occurrence and duration of high spatial and temporal activity of the two scenes is generally uncorrelated; thus dynamic sharing of the channel is generally advantageous compared to allocating half the channel rate to each TV signal.
Publication Date: 1987-09-01
DOI: 10.5594/J03064
Link: https://doi.org/10.5594/J03064
Author(s): R. C. Brainard, A. N. Netravali

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R. C. Brainard and A. N. Netravali; Two TV Signals on a 45 Mbit/sec Channel, SMPTE Journal ( Volume: 96, Issue: 9, September 1987); SMPTE, 1987. Available at https://doi.org/10.5594/J03064

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R. C. Brainard and A. N. Netravali; Two TV Signals on a 45 Mbit/sec Channel, SMPTE Journal ( Volume: 96, Issue: 9, September 1987); SMPTE, 1987. Available at https://doi.org/10.5594/J03064

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R. C. Brainard and A. N. Netravali; Two TV Signals on a 45 Mbit/sec Channel, SMPTE Journal ( Volume: 96, Issue: 9, September 1987); SMPTE, 1987. Available at https://doi.org/10.5594/J03064

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<span class="citation">R. C. Brainard and A. N. Netravali; <cite>Two TV Signals on a 45 Mbit/sec Channel</cite>, SMPTE Journal ( Volume: 96, Issue: 9, September 1987); SMPTE, 1987. Available at <a href="https://doi.org/10.5594/J03064" target="_blank" rel="noopener">https://doi.org/10.5594/J03064</a></span>

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R. C. Brainard and A. N. Netravali; Two TV Signals on a 45 Mbit/sec Channel, SMPTE Journal ( Volume: 96, Issue: 9, September 1987); SMPTE, 1987
doi: 10.5594/J03064
url: https://doi.org/10.5594/J03064

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<li>
R. C. Brainard and A. N. Netravali; <cite id="bib-10-5594-j03064">Two TV Signals on a 45 Mbit/sec Channel</cite>, SMPTE Journal ( Volume: 96, Issue: 9, September 1987); SMPTE, 1987
<span class="doi">10.5594/J03064</span>
</li>