60 Frames/Second Film and Continuous-Motion Projector for Picturephone® System Testing

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Publisher: SMPTE
Doc Type: Journal Article
Article Type: research-article
Abstract: A series of 60 frames/s, 35mm black-and-white sound films has recently been made for use in a PICTUREPHONE® visual telephone system test and evaluation program. In such a subjective test program, a prime requisite is a source of invariant test material for use by imaging on the vidicon target of the visual telephone set. The film production program using a Mitchell high-speed camera modified for synchronous operation at 60 frames/s, included the design and fabrication of a continuous-motion film projector and the solving of several electronic problems in maintaining projection synchronism and in recording double-system sound. The film speed of 60 frames/s was chosen to have a 1:1 correspondence to the vidicon scanning rate. Sound has been recorded synchronously at 18.75 in./s, using a 150-Hz recorded pilot tone locked to the 60-Hz power line. The tape, when played back at 7.5 in./s, provided the requisite 60-Hz pilot tone to synchronize the optical soundtrack processing equipment.
Publication Date: 1967-04-01
DOI: 10.5594/J09164
Link: https://doi.org/10.5594/J09164
Author(s): J. E. Berrang, R. L. Eilenberger

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J. E. Berrang and R. L. Eilenberger; 60 Frames/Second Film and Continuous-Motion Projector for Picturephone® System Testing, Journal of the SMPTE ( Volume: 76, Issue: 4, April 1967); SMPTE, 1967. Available at https://doi.org/10.5594/J09164

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J. E. Berrang and R. L. Eilenberger; 60 Frames/Second Film and Continuous-Motion Projector for Picturephone® System Testing, Journal of the SMPTE ( Volume: 76, Issue: 4, April 1967); SMPTE, 1967. Available at https://doi.org/10.5594/J09164

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<span class="citation">J. E. Berrang and R. L. Eilenberger; <cite>60 Frames/Second Film and Continuous-Motion Projector for Picturephone® System Testing</cite>, Journal of the SMPTE ( Volume: 76, Issue: 4, April 1967); SMPTE, 1967. Available at <a href="https://doi.org/10.5594/J09164" target="_blank" rel="noopener">https://doi.org/10.5594/J09164</a></span>

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<li>
J. E. Berrang and R. L. Eilenberger; <cite id="bib-10-5594-j09164">60 Frames/Second Film and Continuous-Motion Projector for Picturephone® System Testing</cite>, Journal of the SMPTE ( Volume: 76, Issue: 4, April 1967); SMPTE, 1967
<span class="doi">10.5594/J09164</span>
</li>