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SMPTE Journal ( Volume: 88, Issue: 4, April 1979)
[ACTIVE]

Overcoming the Hum Bar and Strobing Problem in Metal-Halide Lighting at the Power-Supply Generator

Metadata

Publisher
SMPTE
Doc Type
Journal Article
Article Type
research-article
Abstract
The subjects of hum bars and glitches on television and strobing on motion-picture film are discussed. When using metal-halide lighting, these defects are caused by differences between the power-supply frequency and the frame-sampling rates of television and film systems. A method of overcoming these problems is suggested, with special reference to mobile generator sets. Most investigators have approached these problems by adding correcting devices to the light source. The author has gone a stage farther back, correcting the problem at the power source. Control of the power-generator frequency and phase is linked to the television sync pulse. A sync-pulse delay is used to correct glitches. Adjustable crystal control is employed for motion-picture use.
Publication Date
1979-04-01
DOI
10.5594/J10413
Link
https://doi.org/10.5594/J10413
Author(s)
Keith W. Hammond
Source Data (JSON)

Full registry record with provenance metadata. Open directly: /api/doc/10.5594-J10413.json

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Keith W. Hammond; Overcoming the Hum Bar and Strobing Problem in Metal-Halide Lighting at the Power-Supply Generator, SMPTE Journal ( Volume: 88, Issue: 4, April 1979); SMPTE, 1979. Available at https://doi.org/10.5594/J10413
Snippet:
Keith W. Hammond; Overcoming the Hum Bar and Strobing Problem in Metal-Halide Lighting at the Power-Supply Generator, SMPTE Journal ( Volume: 88, Issue: 4, April 1979); SMPTE, 1979. Available at https://doi.org/10.5594/J10413

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Keith W. Hammond; Overcoming the Hum Bar and Strobing Problem in Metal-Halide Lighting at the Power-Supply Generator, SMPTE Journal ( Volume: 88, Issue: 4, April 1979); SMPTE, 1979. Available at https://doi.org/10.5594/J10413
Snippet:
<span class="citation">Keith W. Hammond; <cite>Overcoming the Hum Bar and Strobing Problem in Metal-Halide Lighting at the Power-Supply Generator</cite>, SMPTE Journal ( Volume: 88, Issue: 4, April 1979); SMPTE, 1979. Available at <a href="https://doi.org/10.5594/J10413" target="_blank" rel="noopener">https://doi.org/10.5594/J10413</a></span>

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Preview:
Keith W. Hammond; Overcoming the Hum Bar and Strobing Problem in Metal-Halide Lighting at the Power-Supply Generator, SMPTE Journal ( Volume: 88, Issue: 4, April 1979); SMPTE, 1979
doi: 10.5594/J10413
url: https://doi.org/10.5594/J10413
Snippet:
<li>
Keith W. Hammond; <cite id="bib-10-5594-j10413">Overcoming the Hum Bar and Strobing Problem in Metal-Halide Lighting at the Power-Supply Generator</cite>, SMPTE Journal ( Volume: 88, Issue: 4, April 1979); SMPTE, 1979
<span class="doi">10.5594/J10413</span>
</li>