Fletcher-Munson curves
What are Fletcher-Munson Curves?
The Fletcher-Munson curves were created as part of extensive listening experiments. The goal was that subjective perception of volume to be understood via the audible frequency spectrum.
The Fletcher-Munson curves, also called equal loudness contours, show how loud sounds are perceived at different frequencies. These curves were developed in the 1930s by researchers Harvey Fletcher and Wilden A. Munson created. Their research showed that people's hearing reacts differently to sound at different frequencies.
The Fletcher-Munson curves show that some sounds need to be louder at low and high frequenciesto be perceived by people as equally loud compared to medium frequencies. This means that we perceive sounds less clearly at low volumes and at low or high frequencies than at moderate volumes and at medium frequencies.
