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324
CINEMATOGRAPHIC ANNUAL
that his results apply both to speech and music, it is probable that they apply more particularly to music, since the results are based upon the judgments of listeners who regard loudness,
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Volume FIGURE 9.
Curves showing the optimal time of reverberation for auditoriums of different sizes. The upper curve is taken from the data of Watson and Lifschitz. The lower curve, for speech, is obtained from the maxima in Fig. 8. The middle curve is the arithmetical mean of the upper and lower curves, and represents a reasonable choice for both speech and music.
resonance, euphony and other qualities as determining factors. The lowest curve in Fig. 9 shows the optimal time of reverberation for speech, based upon the maximal values of the curves in Fig. 8. It would seem that the bottom and top curves in Fig. 9 give the most trustworthy available data for determining the optimal time of reverberation in auditoriums for either speech or music, where no provision is made for amplifying the power of the voice. If an auditorium is to be used for both speech and music, as is usually the case, it would seem advisable to use the mean value of the two curves. The middle curve is such a mean value curve, and thus gives the optimal time of reverberation for both speech and music.
The importance of the loudness of speech in a large auditorium is strikingly shown by the curves in Fig. 10. These curves have been calculated to show especially how the loudness of speech affects the hearing intelligibility in an auditorium having a volume of 11,300 cubic meters (400,000 cubic feet).