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Fletcher Munson Curves Illustration and Icon
Fletcher Munson Curves
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Equal‑loudness contours (Fletcher–Munson curves) displayed as a family of black curves on a gray grid, with frequency (Hz) on the x‑axis and sound pressure level (dB SPL) on the y‑axis. Curves are labeled in phons and illustrate constant perceived loudness across frequencies, showing maximal human auditory sensitivity around 3–4 kHz and higher required levels at very low and very high frequencies. A green horizontal reference line is included. The figure is used in psychoacoustic modeling, audiometric calibration, and audio engineering to relate physical level to perceived loudness, consistent with ISO 226 equal‑loudness data.
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