Abstract
The equivalent-tone method of Beranek, Marshall, Cudworth, and Peterson has been used as a basis for developing a loudness chart for octave-band data on noise. The loudness chart consists of contours of equal pressure level in octave bands which are superimposed on a loudness grid. The procedure is based on octave-band data, since octave-band filter sets are readily available commercially and are being widely used in noise measurement. Good agreement is shown with loudness values for various noises determined by Beranek et al., using 300 and 600-mel bands, and there is, therefore, good agreement with existing psychological data. The loudness chart not only facilitates the calculation of loudness but provides graphical loudness curves for comparison of noise and for the evaluation of various noise reduction measures.
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