Digital Television at 45 Mbits/Sec

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Publisher: SMPTE
Doc Type: Journal Article
Article Type: research-article
Abstract: An algorithm and a real-time hardware implementation are described for coding composite NTSC signal sampled at 4X color subcarrier into 45 Mbits/sec while preserving network quality. Adaptive differential pulse-code modulation and variable word-length coding are used to minimize the data source rate for the channel, requiring a buffer to smooth the data rate. Predictors and predictor-selection techniques are described. Variable word-length code sets were designed for each. Resultant data rates were used as a measure to determine the best predictor-selection technique for use. The coder switches between various modes of operation depending on buffer content or fullness. When the buffer fullness increases sufficiently, a mode with a coarser quantizer is used. For higher values, 4:3 and 2:1 subsampling is used. Tests and demonstrations are done on a combination hardware/software test-bed.
Publication Date: 1987-01-01
DOI: 10.5594/J04027
Link: https://doi.org/10.5594/J04027
Author(s): R. C. Brainard, A. N. Netravali

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R. C. Brainard and A. N. Netravali; Digital Television at 45 Mbits/Sec, SMPTE Journal ( Volume: 96, Issue: 1, January 1987); SMPTE, 1987. Available at https://doi.org/10.5594/J04027

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R. C. Brainard and A. N. Netravali; Digital Television at 45 Mbits/Sec, SMPTE Journal ( Volume: 96, Issue: 1, January 1987); SMPTE, 1987. Available at https://doi.org/10.5594/J04027

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R. C. Brainard and A. N. Netravali; Digital Television at 45 Mbits/Sec, SMPTE Journal ( Volume: 96, Issue: 1, January 1987); SMPTE, 1987. Available at https://doi.org/10.5594/J04027

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<span class="citation">R. C. Brainard and A. N. Netravali; <cite>Digital Television at 45 Mbits/Sec</cite>, SMPTE Journal ( Volume: 96, Issue: 1, January 1987); SMPTE, 1987. Available at <a href="https://doi.org/10.5594/J04027" target="_blank" rel="noopener">https://doi.org/10.5594/J04027</a></span>

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R. C. Brainard and A. N. Netravali; Digital Television at 45 Mbits/Sec, SMPTE Journal ( Volume: 96, Issue: 1, January 1987); SMPTE, 1987
doi: 10.5594/J04027
url: https://doi.org/10.5594/J04027

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<li>
R. C. Brainard and A. N. Netravali; <cite id="bib-10-5594-j04027">Digital Television at 45 Mbits/Sec</cite>, SMPTE Journal ( Volume: 96, Issue: 1, January 1987); SMPTE, 1987
<span class="doi">10.5594/J04027</span>
</li>