How were the equal loudness contours developed: through (i) computer simulations, (ii) measurements, or (iii) a combination of computer simulations and measurements?
Question
How were the equal loudness contours developed: through (i) computer simulations, (ii) measurements, or (iii) a combination of computer simulations and measurements?
Solution
The equal loudness contours were developed through measurements. The process involved playing sounds of different frequencies and intensities to human subjects, who would then indicate when two sounds appeared to be of equal loudness. This process was repeated with many subjects and the results were averaged to produce the contours. This method is based on the psychoacoustic phenomenon of human perception of sound, which can vary greatly between individuals. Therefore, it was necessary to use a large number of subjects to obtain a reliable average. The contours were first measured by Fletcher and Munson in the 1930s and have been refined by later researchers.
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