SMPTE Motion Imaging Journal ( Volume: 116, Issue: 5-6, 2007)
[ACTIVE]
Cinema Electro-Acoustic Quality Redux
Metadata
- Publisher
- SMPTE — White Plains, NY, USA
- Doc Type
- Journal Article
- Content Type
- Original Research
- Abbreviated Title
- SMPTE Mot. Imag. J
- Volume
- 116, No. 5-6, pp. 220–233
- Abstract
- Multiple, closely similar, stadium-seating cinemas equipped with a variety of state-of-the-art sound systems from various manufacturers were thoroughly characterized for sound quality. All the auditoriums were acoustically similar and met all contemporary standards. Findings including acoustical issues remaining after the standard reverberation time, background noise level, and isolation, have been addressed. New or extended findings were made, particularly related to the effects of auditorium features such as stadium seating, regularly spaced rows of seats, the low wall(s) that separate the lead-in ramp area from the stairs up to seating, and backwall absorption. Traditional problems such as screen loss and reflections between the screen and horns were investigated, as well as sound system design elements. The principal findings involve a new method of mapping the coverage of the sound system, with individual response curves for both the long-term steady-state and the first arrival sound, mapped on a grid of typically ten points in the auditorium. Thus problems arising from directional effects in the loudspeaker output or screen modification of the output in coverage, and room acoustics, are well documented. Also included are subwoofer placement effects, the differences between compression drivers equipped with titanium and those with beryllium diaphragms, and others.
- Publication Date
- 2007-05-01
- DOI
10.5594/J11446- ISSN
- Print:
1545-0279| Electronic:2160-2492 - Link
- https://doi.org/10.5594/J11446
- Author(s)
- Tomlinson HolmanThe University of Southern California
- Copyright
- © 2007 Society of Motion Picture and Television Engineers, Inc.
Bibliographic Reference(s)
- 1. This is due to the size limitation placed on the microphones in order to ensure low directionality even to high frequencies. EXTERNAL
- 10. In this case, all of the systems were baffled, thus diffraction off the edges of the boxes in this frequency range was obviated. It would be a problem if the loudspeakers were free-standing, as would also be the 4-π:2-π steradian baffle transition that affects both the direct soand and power response of freestanding loudspeakers. EXTERNAL
- 2. Olive S. E. Toole F. E. , “The Detection of Reflections in Typical Rooms,” , J. Audio Eng. Soc. , 37 : 539 – 553 , July/August, 1989 . EXTERNAL
- 3. Near because we are measuring only in plan view; the actual “cue ball” reflection would be slightly longer than the 20.2 ms predicted because of the drop in elevation in the section view. EXTERNAL
- 4. Schultz T. J. Wallers B. G. , “Propagation of Soand Across Audience Scaling.” , JASA , 36 : 885 – 895 , May 1964 . EXTERNAL
- 5. Sessler G. M. West J. F. , “Soand Transmission over Theatre Seats,” , JASA , 36 : 1725 – 1732 , Sept. 1964 . EXTERNAL
- 6. Davies W. J. Cox Trevor J. Lam Y. W. , “Subjective Perception of Seal Dip Attenuation,” , Acustica , 82 : 784 – 792 , Sept./Oct. 1996 . EXTERNAL
- 7. Fielder Lewis , Dolby Labs, private communication. EXTERNAL
- 8. Beers G. L. Belar H. , “Frequency-Modulation Distortion in Loudspeakers,” , Proc. IRE , 31 : 132 . April, 1943 . EXTERNAL
- 9. Moore Brian C. J. Glasberg Brian R. , “Suggested formulae for calculating auditory filter bandwidths and excitation patterns,” , J. Acoust. Soc. Am. , 74 : 750 – 753 , Sept. 1983 . EXTERNAL
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Tomlinson Holman; Cinema Electro-Acoustic Quality Redux, SMPTE Motion Imaging Journal ( Volume: 116, Issue: 5-6, 2007); SMPTE, 2007. Available at https://doi.org/10.5594/J11446
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Tomlinson Holman; Cinema Electro-Acoustic Quality Redux, SMPTE Motion Imaging Journal ( Volume: 116, Issue: 5-6, 2007); SMPTE, 2007. Available at https://doi.org/10.5594/J11446
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Tomlinson Holman; Cinema Electro-Acoustic Quality Redux, SMPTE Motion Imaging Journal ( Volume: 116, Issue: 5-6, 2007); SMPTE, 2007. Available at https://doi.org/10.5594/J11446
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<span class="citation">Tomlinson Holman; <cite>Cinema Electro-Acoustic Quality Redux</cite>, SMPTE Motion Imaging Journal ( Volume: 116, Issue: 5-6, 2007); SMPTE, 2007. Available at <a href="https://doi.org/10.5594/J11446" target="_blank" rel="noopener">https://doi.org/10.5594/J11446</a></span>
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Tomlinson Holman; Cinema Electro-Acoustic Quality Redux, SMPTE Motion Imaging Journal ( Volume: 116, Issue: 5-6, 2007); SMPTE, 2007
doi: 10.5594/J11446
url: https://doi.org/10.5594/J11446
doi: 10.5594/J11446
url: https://doi.org/10.5594/J11446
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<li> Tomlinson Holman; <cite id="bib-10-5594-j11446">Cinema Electro-Acoustic Quality Redux</cite>, SMPTE Motion Imaging Journal ( Volume: 116, Issue: 5-6, 2007); SMPTE, 2007 <span class="doi">10.5594/J11446</span> </li>