Frequency Response versus Time-of-Arrival for Typical Cinemas

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Publisher: SMPTE — White Plains, NY
Doc Type: Conference Paper
Content Type: Original Research
Volume: 2012, No. 10, pp. 1–24
Abstract: Cinema equalization is typically based on the use of 1/3-octave, minimum-phase filtering to adjust the spatial average of the steady-state magnitude response from multiple microphones to the X-curve. This paper explores one aspect of this process, namely whether the use of steady-state response is appropriate. The relationship between early-arrival and steady-state spectral characteristics for typical cinemas was examined. The comparison between early-arrival and steady-state sounds was done via spectral analyses of impulse responses measured at multiple microphone locations within the audience seating area. The cinemas surveyed varied in size between 30–500 seats and the time-gating intervals varied from 4 ms to that equivalent to steady state. When the survey was done, front loudspeaker measurements above 500 Hz showed little spectral tilt upward toward “brightness” for early-arrival, compared to steady-state sounds, and a modest upward tilt for surround loudspeaker arrays in the largest cinemas. Larger response differences occurred below 500 Hz.
Publication Date: 2012-10-01
DOI: 10.5594/M001481
Link: https://doi.org/10.5594/M001481
Author(s): Louis D. FielderDolby Laboratories, Inc, 100 Potrero Ave., San Francisco, CA 94103
Keyword(s): B-Chain
Copyright: © 2012 Society of Motion Picture and Television Engineers, Inc.

Bibliographic Reference(s)

Motion-Picture Theater Sound System Performance: New Studies of the B-Chain [Active]
Cinema Electro-Acoustic Quality Redux [Active]
The X-Curve: Its Origins and History: Electro-Acoustic Characteristics in the Cinema and the Mix-Room, the Large Room and the Small [Active]
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Louis D. Fielder; Frequency Response versus Time-of-Arrival for Typical Cinemas, SMPTE Meetings and Conferences ( October 2012); SMPTE, 2012. Available at https://doi.org/10.5594/M001481

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<span class="citation">Louis D. Fielder; <cite>Frequency Response versus Time-of-Arrival for Typical Cinemas</cite>, SMPTE Meetings and Conferences ( October 2012); SMPTE, 2012. Available at <a href="https://doi.org/10.5594/M001481" target="_blank" rel="noopener">https://doi.org/10.5594/M001481</a></span>

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Louis D. Fielder; Frequency Response versus Time-of-Arrival for Typical Cinemas, SMPTE Meetings and Conferences ( October 2012); SMPTE, 2012
doi: 10.5594/M001481
url: https://doi.org/10.5594/M001481

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Louis D. Fielder; <cite id="bib-10-5594-m001481">Frequency Response versus Time-of-Arrival for Typical Cinemas</cite>, SMPTE Meetings and Conferences ( October 2012); SMPTE, 2012
<span class="doi">10.5594/M001481</span>
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