Combined Line and Dot Interlace in Television Rasters

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Publisher: SMPTE
Doc Type: Journal Article
Article Type: research-article
Abstract: A combination of high-order line and dot interlace can be used to reduce the repetition frequency of a TV picture without materially altering the line and field frequencies. The benefit of reduced repetition frequency is an increase in the number of picture elements that can be transmitted in a specified bandwidth. Combined interlace is therefore a possible method for increasing the resolution of an existing TV system, provided some break-up of moving pictures can be tolerated. For Ith-order line interlace and Jth-order dot interlace, the picture period is IJ field periods and the number of picture elements is increased by the factor ½IJ over a normal 2:1 line-interlaced system. The total number of dot sequence patterns in which the raster can be scanned is IJ2. A general method is given for calculating these sequences, and the subjective effects of all sequences for Iand J up to 7 are cataloged. About half the sequences are degenerate in that they belong to a lower order. The majority of the remainder are subjectively unacceptable because of flicker, line crawl, and snow-storm effects in the CRT display. A few good sequences do exist, however, and if the CRT has a long-persistence phosphor the product IJ can be at least as large as 40. It is therefore possible to transmit medium-resolution graphics (∼106 picture elements) in real time over a 1-MHz channel.
Publication Date: 1974-09-01
DOI: 10.5594/J06922
Link: https://doi.org/10.5594/J06922
Author(s): Edward M. Cherry

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Edward M. Cherry; Combined Line and Dot Interlace in Television Rasters, Journal of the SMPTE ( Volume: 83, Issue: 9, September 1974); SMPTE, 1974. Available at https://doi.org/10.5594/J06922

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Edward M. Cherry; Combined Line and Dot Interlace in Television Rasters, Journal of the SMPTE ( Volume: 83, Issue: 9, September 1974); SMPTE, 1974. Available at https://doi.org/10.5594/J06922

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Edward M. Cherry; Combined Line and Dot Interlace in Television Rasters, Journal of the SMPTE ( Volume: 83, Issue: 9, September 1974); SMPTE, 1974. Available at https://doi.org/10.5594/J06922

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<span class="citation">Edward M. Cherry; <cite>Combined Line and Dot Interlace in Television Rasters</cite>, Journal of the SMPTE ( Volume: 83, Issue: 9, September 1974); SMPTE, 1974. Available at <a href="https://doi.org/10.5594/J06922" target="_blank" rel="noopener">https://doi.org/10.5594/J06922</a></span>

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Edward M. Cherry; Combined Line and Dot Interlace in Television Rasters, Journal of the SMPTE ( Volume: 83, Issue: 9, September 1974); SMPTE, 1974
doi: 10.5594/J06922
url: https://doi.org/10.5594/J06922

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<li>
Edward M. Cherry; <cite id="bib-10-5594-j06922">Combined Line and Dot Interlace in Television Rasters</cite>, Journal of the SMPTE ( Volume: 83, Issue: 9, September 1974); SMPTE, 1974
<span class="doi">10.5594/J06922</span>
</li>