The Evaluation and Standardization of the Loudspeaker-Acoustics Link in Motion-Picture Theaters

In the process of developing a monophonic magnetic sound system, deficiencies and wide variations in auditorium acoustics and loudspeaker characteristics were accentuated. Subjective methods of alignment and correction were found inadequate and time consuming. A method of quantitative measurement and analysis has been evolved and applied to studio re-recording and review rooms. Liaison with member countries of ISO TC 36 has been established and work is proceeding to establish standards to which studio re-recording theaters and cinemas can be aligned. — For practical reasons loudspeaker characteristics and theater acoustics must be investigated together. Subjective assessments should be supplemented with measured data giving information on reverberation times, sound pressure levels, and pulse reflection patterns. The methods used to make these tests are described, with a summary of the results obtained from a survey of studio re-recording theaters. To obtain better matching between these, adjustments can often be made by using electrical compensation, but in larger theaters and in the cinema field this may be more difficult, and acoustic correction or redesign may be necessary in the worst cases.

Print ISSN

0361-4573

Published

1969-12

Content type

Original Research

DOI

10.5594/J10758