Digital Time-Base Correction for Video Signal Processing

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Publisher: SMPTE
Doc Type: Journal Article
Article Type: research-article
Abstract: Recent advances in digital television are exemplified in the techniques now available for processing and correcting the errors that arise when videotape is played back with a VTR. Such techniques use time-base correctors (TBCs) in systems for eliminating VTR distortions. A short history of time-base correction is given, from the delay-line units used 20 years ago with quadruplex VTRs to the latest digital TBCs that can reduce large time-base errors of helical-scan VTRs virtually to invisibility. Principles and details of the Microtime 640 Digital TBC are discussed. Briefly, it operates in either the V/H-lock or no-lock mode. Either direct or heterodyne color recovery can be selected. The input signal is sampled at three times the color subcarrier frequency, and 8-bit PCM encoding is used. For speed and simplicity of control, the Model 640 employs a bipolar random-access memory (RAM) of about 24-kbit capacity. Such TBCs can now interface with virtually any VTR, and their use is expected to grow steadily.
Publication Date: 1976-03-01
DOI: 10.5594/J06852
Link: https://doi.org/10.5594/J06852
Author(s): David E. Acker, Richard H. Mclean

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David E. Acker and Richard H. Mclean; Digital Time-Base Correction for Video Signal Processing, SMPTE Journal ( Volume: 85, Issue: 3, March 1976); SMPTE, 1976. Available at https://doi.org/10.5594/J06852

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David E. Acker and Richard H. Mclean; Digital Time-Base Correction for Video Signal Processing, SMPTE Journal ( Volume: 85, Issue: 3, March 1976); SMPTE, 1976. Available at https://doi.org/10.5594/J06852

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<span class="citation">David E. Acker and Richard H. Mclean; <cite>Digital Time-Base Correction for Video Signal Processing</cite>, SMPTE Journal ( Volume: 85, Issue: 3, March 1976); SMPTE, 1976. Available at <a href="https://doi.org/10.5594/J06852" target="_blank" rel="noopener">https://doi.org/10.5594/J06852</a></span>

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David E. Acker and Richard H. Mclean; Digital Time-Base Correction for Video Signal Processing, SMPTE Journal ( Volume: 85, Issue: 3, March 1976); SMPTE, 1976
doi: 10.5594/J06852
url: https://doi.org/10.5594/J06852

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David E. Acker and Richard H. Mclean; <cite id="bib-10-5594-j06852">Digital Time-Base Correction for Video Signal Processing</cite>, SMPTE Journal ( Volume: 85, Issue: 3, March 1976); SMPTE, 1976
<span class="doi">10.5594/J06852</span>
</li>