SMPTE Journal ( Volume: 96, Issue: 9, September 1987)
[ACTIVE]
Two TV Signals on a 45 Mbit/sec Channel
Metadata
- Publisher
- SMPTE — White Plains, NY, USA
- Doc Type
- Journal Article
- Content Type
- Original Research
- Abbreviated Title
- J SMPTE
- Volume
- 96, No. 9, pp. 834–836
- 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- ISSN
- Print:
0036-1682 - Link
- https://doi.org/10.5594/J03064
- Author(s)
- R. C. BrainardAT&T Bell Laboratories, Holmdel, NJ 97733.A. N. NetravaliAT&T Bell Laboratories, Murray Hill, NJ 07974
- Copyright
- © 1987 Society of Motion Picture and Television Engineers, Inc.
Bibliographic Reference(s)
- Programmable Test-Bed for Composite Television Coding [Active]
- Composite Television Coding: Subsampling and Interpolation [Active]
- Predictive Coding of Composite NTSC Color Television Signals [Active]
- Digital Television at 45 Mbits/Sec [Active]
- 5. Kretz F. , Private communication, 1982 . EXTERNAL
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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
doi: 10.5594/J03064
url: https://doi.org/10.5594/J03064
Snippet:
<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>