Hello Wayne. It's been a long time and I hope you are well. Being a speaker designer, I was wondering what you knew about how we hear at different volumes. I read about a study done years ago about how the ear hears frequencies on a curve depending on volume. I am guessing this was the reason for the design of a loudness circuit on some equipment.
Wayne Parham Messages: 18787 Registered: January 2001
Illuminati (33rd Degree)
Yes, that's the Fletcher-Munson curves, sometimes also called equal loudness curves. These are the result of studies made at Bell Labs in the 1930s by Fletcher and Munson. They asked people to judge when pure tones of two different frequencies were the same loudness, and plotted the resulting charts.
Wayne Parham Messages: 18787 Registered: January 2001
Illuminati (33rd Degree)
That's exactly what a loudness circuit does. When you press the "loudness" button on a sound system, it implements EQ based on the Fletcher-Munson curves.
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