What if we go down to 100 Hz? Now our 80 phon line is closer to 90 dB SPL. That aligns with our definition of phons-so far, so good. Here are the contours from the 2003 revision of ISO 226 in red, with the original Fletcher-Munson curves underlaid in blue for comparison.įirst, notice that at 1,000 Hz, the 80 phon line aligns with 80 dB SPL. While this doesn’t change any of the fundamental concepts behind the original Fletcher Munson equal loudness contours, it does help refine our understanding of the human perception of pitch and loudness. The last revision was published in 2003 based on research in Japan, Germany, Denmark, the UK, and the US, and there is currently a subsequent revision under development. Believe it or not, since 1961 the ISO has published standard 226 as the benchmark for equal loudness contours. In the better part of the century since Fletcher and Munson’s original work, there have been numerous other studies aimed at taking similar measurements. Bringing equal loudness into the 21st century We’ll get into how to interpret these contours, and some of the complexities behind creating them shortly, but first it’s worth mentioning that although it’s still common to cite Fletcher and Munson when discussing equal loudness, their original work is now nearly 90 years old, and can hardly be said to be state of the art anymore.
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