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Journal of the Society of Motion Picture Engineers ( Volume: 16, Issue: 3, March 1931)
[ACTIVE]

Some New RCA Photophone Studio Recording Equipment

Metadata

Publisher
SMPTE
Doc Type
Journal Article
Article Type
research-article
Abstract
An illustrated description is given of some new input equipment for sound recording. This equipment provides for mixing the audio outputs of four or eight microphones into the recording amplifier, which has two output channels. Some of the interesting features of this equipment are: (a) Constant impedance mixing, providing constant load on each microphone amplifier for all combinations of volume control settings, thus giving unchanging fidelity and a constant output level from each microphone channel for all combinations of volume control settings in the other channels: (b) Filter for eliminating low rumbles, caused by room vibrations, wind disturbances, etc., can be switched “on” or “off” at the mixer. This filter does not affect the fidelity above 100 cycles. (c) Recording amplifier, having two output channels, supplying two loads with no interaction between them. Each channel has a convenient switching arrangement for changing the output transformer ratio, making possible the operation of one, two, or three 500 ohm loads in parallel. (d) Each unit of the equipment is designed to mount on a standard relay rack or in an individual box equipped with handles for carrying.
Publication Date
1931-03-01
DOI
10.5594/J13013
Link
https://doi.org/10.5594/J13013
Author(s)
W. P. Dutton, S. Read
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W. P. Dutton and S. Read; Some New RCA Photophone Studio Recording Equipment, Journal of the Society of Motion Picture Engineers ( Volume: 16, Issue: 3, March 1931); SMPTE, 1931. Available at https://doi.org/10.5594/J13013
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W. P. Dutton and S. Read; Some New RCA Photophone Studio Recording Equipment, Journal of the Society of Motion Picture Engineers ( Volume: 16, Issue: 3, March 1931); SMPTE, 1931. Available at https://doi.org/10.5594/J13013

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W. P. Dutton and S. Read; Some New RCA Photophone Studio Recording Equipment, Journal of the Society of Motion Picture Engineers ( Volume: 16, Issue: 3, March 1931); SMPTE, 1931. Available at https://doi.org/10.5594/J13013
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<span class="citation">W. P. Dutton and S. Read; <cite>Some New RCA Photophone Studio Recording Equipment</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 16, Issue: 3, March 1931); SMPTE, 1931. Available at <a href="https://doi.org/10.5594/J13013" target="_blank" rel="noopener">https://doi.org/10.5594/J13013</a></span>

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Preview:
W. P. Dutton and S. Read; Some New RCA Photophone Studio Recording Equipment, Journal of the Society of Motion Picture Engineers ( Volume: 16, Issue: 3, March 1931); SMPTE, 1931
doi: 10.5594/J13013
url: https://doi.org/10.5594/J13013
Snippet:
<li>
W. P. Dutton and S. Read; <cite id="bib-10-5594-j13013">Some New RCA Photophone Studio Recording Equipment</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 16, Issue: 3, March 1931); SMPTE, 1931
<span class="doi">10.5594/J13013</span>
</li>