Digital-to-Analog Conversion — Data and Filter Requirements

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Publisher: SMPTE — White Plains, NY, USA
Doc Type: Journal Article
Content Type: Original Research
Volume: 104, No. 3, pp. 120–124
Abstract: Ringing in the analog waveform caused by the filter response to the converted digital data is not a new problem. Early digital-based character generators for composite television applications caused significant ringing because the digital data produced too sharp an edge in the picture. Due to the specifications of component digital video, these edge effects are once again becoming more apparent in television operations. This paper discusses the results of using 13.5-MHz, luminance sampling to obtain flat analog bandwidth to 5.75 MHz, and how the filter template required by the international standard will inevitably result in some noticeable ringing on fast picture transitions. Data requirements in the digital domain are analyzed using 2-T pulses as an example while suggesting a different edge transition that will produce much less ringing. Designers are advised to consider the application of filters or edge processing to reduce the ringing due to digitally generated signals.
Publication Date: 1995-03-01
DOI: 10.5594/J09630
ISSN: Print: 0036-1682
Link: https://doi.org/10.5594/J09630
Author(s): Dan BakerTektronix, Inc., Beaverton, OR 97077
David FibushTektronix, Inc., Beaverton, OR 97077
Bruce PenneyTektronix, Inc., Beaverton, OR 97077
Copyright: © 1995 Society of Motion Picture and Television Engineers, Inc.

Bibliographic Reference(s)

1. Television Measurements — NTSC Systems , Tektronix Inc. : Beaverlon, Ore. , 1989 . EXTERNAL
2. Rec. ITU-R BT.601, “Encoding Parameters of Digital Television for Studios.” . EXTERNAL
3. Report ITU-R BT.962–2, “The Filtering, Sampling and Multiplexing for Digital Encoding of Colour Television Signals.” . EXTERNAL
4. Rec. ITU-R BT.801, “Test Signals for Digitally Encoded Colour Television Signals Conforming with Recommendations 601 and 656.” . EXTERNAL
5. SMPTE RP 178, “Serial Digital Interface Check Field for 10-bit 4:2:2 Component-and 4fsc Composite Digital Signals.” . EXTERNAL

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Dan Baker, David Fibush, and Bruce Penney; Digital-to-Analog Conversion — Data and Filter Requirements, SMPTE Journal ( Volume: 104, Issue: 3, March 1995); SMPTE, 1995. Available at https://doi.org/10.5594/J09630

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Dan Baker, David Fibush, and Bruce Penney; Digital-to-Analog Conversion — Data and Filter Requirements, SMPTE Journal ( Volume: 104, Issue: 3, March 1995); SMPTE, 1995. Available at https://doi.org/10.5594/J09630

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<span class="citation">Dan Baker, David Fibush, and Bruce Penney; <cite>Digital-to-Analog Conversion — Data and Filter Requirements</cite>, SMPTE Journal ( Volume: 104, Issue: 3, March 1995); SMPTE, 1995. Available at <a href="https://doi.org/10.5594/J09630" target="_blank" rel="noopener">https://doi.org/10.5594/J09630</a></span>

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Dan Baker, David Fibush, and Bruce Penney; Digital-to-Analog Conversion — Data and Filter Requirements, SMPTE Journal ( Volume: 104, Issue: 3, March 1995); SMPTE, 1995
doi: 10.5594/J09630
url: https://doi.org/10.5594/J09630

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<li>
Dan Baker, David Fibush, and Bruce Penney; <cite id="bib-10-5594-j09630">Digital-to-Analog Conversion — Data and Filter Requirements</cite>, SMPTE Journal ( Volume: 104, Issue: 3, March 1995); SMPTE, 1995
<span class="doi">10.5594/J09630</span>
</li>