Journal of the Society of Motion Picture Engineers ( Volume: 37, Issue: 12, December 1941)

[ACTIVE]

A Compact Direct-Reading Reverberation Meter

Metadata

Publisher: SMPTE — White Plains, NY, USA
Doc Type: Journal Article
Content Type: Original Research
Abbreviated Title: J SMPE
Volume: 37, No. 12, pp. 557–568
Abstract: Conditions surrounding widespread measurement of reverberation time in theaters by a theater service organization require that the measuring equipment stress economy in size, in cost, and in time for a set of measurements, and the readings provided must be in such form that an acoustical specialist is not required for their interpretation. These requirements must be satisfied even to the sacrifice of information on secondary properties of the decay characteristic. Several types of direct-reading reverberation-time meter circuits were devised and one of these types, in trial quantity, is now giving service in the field. These instruments integrate the decaying signal over approximately a 5-db interval beginning after approximately 18 db of decay, and the result is translated into reverberation time by meter scales. Thus the first 22 db (approx.) of the decay characteristic is encompassed by the reading and it is shown that the contained energy includes essentially all the reverberant energy important to quality. Reverberation measurements are made with these instruments at the time that acoustical response measurements are being made, and under these conditions 150 time readings may be made throughout the auditorium and over the audio spectrum in a total added time of forty minutes. Practically no further treatment of the data is required.
Publication Date: 1941-12-01
DOI: 10.5594/J09945
ISSN: Print: 0097-5834
Link: https://doi.org/10.5594/J09945
Author(s): E. S. SeeleyAltec Service Corp., New York, N. Y.
Copyright: © 1941 Society of Motion Picture and Television Engineers, Inc.

Bibliographic Reference(s)

1 Mueller W. A. : “Audience Noise as a Limitation to the Permissible Volume Range of Dialog in Sound Motion Pictures,” J. Soc. Mot. Pict. Eng. , XXXV (July, 1940 ), p. 48 . EXTERNAL

Source Data (JSON)

Full registry record with provenance metadata. Open directly: /api/doc/10.5594-J09945.json

Reference Tree

Explore all references and references to this document, as a navigable tree.

Open Reference Tree

Reference this Doc

Plain text (ISO 690 compliant)

Preview:

E. S. Seeley; A Compact Direct-Reading Reverberation Meter, Journal of the Society of Motion Picture Engineers ( Volume: 37, Issue: 12, December 1941); SMPTE, 1941. Available at https://doi.org/10.5594/J09945

Snippet:

E. S. Seeley; A Compact Direct-Reading Reverberation Meter, Journal of the Society of Motion Picture Engineers ( Volume: 37, Issue: 12, December 1941); SMPTE, 1941. Available at https://doi.org/10.5594/J09945

HTML (ISO 690 compliant)

Preview:

Snippet:

<span class="citation">E. S. Seeley; <cite>A Compact Direct-Reading Reverberation Meter</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 37, Issue: 12, December 1941); SMPTE, 1941. Available at <a href="https://doi.org/10.5594/J09945" target="_blank" rel="noopener">https://doi.org/10.5594/J09945</a></span>

SMPTE's HTML Pub

Preview:

E. S. Seeley; A Compact Direct-Reading Reverberation Meter, Journal of the Society of Motion Picture Engineers ( Volume: 37, Issue: 12, December 1941); SMPTE, 1941
doi: 10.5594/J09945
url: https://doi.org/10.5594/J09945

Snippet:

<li>
E. S. Seeley; <cite id="bib-10-5594-j09945">A Compact Direct-Reading Reverberation Meter</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 37, Issue: 12, December 1941); SMPTE, 1941
<span class="doi">10.5594/J09945</span>
</li>