Journal of the Society of Motion Picture Engineers ( Volume: 29, Issue: 5, November 1937)

[ACTIVE]

Effect of Uneven Slit Illumination upon Distortion in Several Types of Variable-Width Records

Metadata

Publisher: SMPTE
Doc Type: Journal Article
Article Type: research-article
Abstract: The effect of uneven slit illumination upon the reproduction of variable-width sound-tracks of the unilateral and bilateral types are analyzed. The ground-noise reduction for unilateral tracks is considered, as accomplished by a single-vane shutter so that the modulations are recorded symmetrically with respect to the center of the track. For bilateral tracks both electrical biasing and double-vane shutters are considered for effecting ground-noise reduction. When the slit illumination increases linearly across the sound-track, bilateral records either with electrical or shutter ground-noise reduction are not distorted. When the illumination changes by 20 per cent across the sound-track by any uniform function that would correspond to any actual case of faulty adjustment, the harmonic distortion in no case exceeds 3 per cent for fully modulated signals. Further, the percentage of distortion decreases with the signal strength. Thus, while the reproduction of variable-width recordings is subject to distortion by uneven slit illumination, it is not excessive on equipment properly serviced.
Publication Date: 1937-11-01
DOI: 10.5594/J14727
Link: https://doi.org/10.5594/J14727
Author(s): C. N. Batsel, C. H. Cartwright

Source Data (JSON)

Full registry record with provenance metadata. Open directly: /api/doc/10.5594-J14727.json

Reference this Doc

Plain text (ISO 690 compliant)

Preview:

C. N. Batsel and C. H. Cartwright; Effect of Uneven Slit Illumination upon Distortion in Several Types of Variable-Width Records, Journal of the Society of Motion Picture Engineers ( Volume: 29, Issue: 5, November 1937); SMPTE, 1937. Available at https://doi.org/10.5594/J14727

Snippet:

C. N. Batsel and C. H. Cartwright; Effect of Uneven Slit Illumination upon Distortion in Several Types of Variable-Width Records, Journal of the Society of Motion Picture Engineers ( Volume: 29, Issue: 5, November 1937); SMPTE, 1937. Available at https://doi.org/10.5594/J14727

HTML (ISO 690 compliant)

Preview:

Snippet:

<span class="citation">C. N. Batsel and C. H. Cartwright; <cite>Effect of Uneven Slit Illumination upon Distortion in Several Types of Variable-Width Records</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 29, Issue: 5, November 1937); SMPTE, 1937. Available at <a href="https://doi.org/10.5594/J14727" target="_blank" rel="noopener">https://doi.org/10.5594/J14727</a></span>

SMPTE's HTML Pub

Preview:

Snippet:

<li>
C. N. Batsel and C. H. Cartwright; <cite id="bib-10-5594-j14727">Effect of Uneven Slit Illumination upon Distortion in Several Types of Variable-Width Records</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 29, Issue: 5, November 1937); SMPTE, 1937
<span class="doi">10.5594/J14727</span>
</li>