Transmission of Audio Signals by Infrared Light Carrier

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Publisher: SMPTE — White Plains, NY, USA
Doc Type: Journal Article
Content Type: Original Research
Abbreviated Title: J SMPTE
Volume: 89, No. 11, pp. 834–837
Abstract: A recently developed technique for the wireless transmission of audio signals makes use of the invisible modulated infrared radiation. Infrared emitting gallium-arsenide luminescence diodes are used as radiators of the modulated signal. As receiver, a photosensitive diode is used. Its plastic convex lens concentrates the incident infrared radiation on the rather small photosensitive diode surface. To eliminate the action of visible light, a so-called black filter - transparent only to infrared - is interposed. Amplitude modulation of the infrared emitter is possible, but cannot be used because other ambient light sources could create interference. To overcome this obstacle, frequency modulation of an amplitude-modulated standardized carrier frequency is used. The distribution of infrared radiators in a room is touched upon, and interference levels from ambient light sources are indicated. The components of a monophonic infrared audio transmission system are discussed.
Publication Date: 1980-11-01
DOI: 10.5594/J01540
ISSN: Print: 0036-1682
Link: https://doi.org/10.5594/J01540
Author(s): Horst A. AnkermannIPAS International Corp., 1440 Broadway, Suite 2250, New York, NY 10018.
Copyright: © 1980 Society of Motion Picture and Television Engineers, Inc.

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Horst A. Ankermann; Transmission of Audio Signals by Infrared Light Carrier, SMPTE Journal ( Volume: 89, Issue: 11, November 1980); SMPTE, 1980. Available at https://doi.org/10.5594/J01540

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Horst A. Ankermann; Transmission of Audio Signals by Infrared Light Carrier, SMPTE Journal ( Volume: 89, Issue: 11, November 1980); SMPTE, 1980. Available at https://doi.org/10.5594/J01540

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Horst A. Ankermann; Transmission of Audio Signals by Infrared Light Carrier, SMPTE Journal ( Volume: 89, Issue: 11, November 1980); SMPTE, 1980. Available at https://doi.org/10.5594/J01540

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<span class="citation">Horst A. Ankermann; <cite>Transmission of Audio Signals by Infrared Light Carrier</cite>, SMPTE Journal ( Volume: 89, Issue: 11, November 1980); SMPTE, 1980. Available at <a href="https://doi.org/10.5594/J01540" target="_blank" rel="noopener">https://doi.org/10.5594/J01540</a></span>

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Horst A. Ankermann; Transmission of Audio Signals by Infrared Light Carrier, SMPTE Journal ( Volume: 89, Issue: 11, November 1980); SMPTE, 1980
doi: 10.5594/J01540
url: https://doi.org/10.5594/J01540

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<li>
Horst A. Ankermann; <cite id="bib-10-5594-j01540">Transmission of Audio Signals by Infrared Light Carrier</cite>, SMPTE Journal ( Volume: 89, Issue: 11, November 1980); SMPTE, 1980
<span class="doi">10.5594/J01540</span>
</li>