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Understanding Loudness Levels and Fletcher Curves in Acoustics

This seminar focuses on understanding loudness levels as described by Fletcher curves through hands-on problems. We start with a 10 kHz sinusoidal signal measured at 10 dB SPL, exploring its gradual frequency reduction to 1 kHz and then 100 Hz, where SPL readings are 30 dB and 0 dB, respectively. Participants will calculate the loudness levels in phons for each frequency and discuss the differences observed despite constant output power. Additionally, we analyze the loudness of compound signals using two frequencies and examine their combined loudness effect.

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Understanding Loudness Levels and Fletcher Curves in Acoustics

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  1. Acoustics Seminary 3

  2. Problem 3.1 Getting acquainted with Fletcher curves The 10 kHz sinusoidal signal of a wave generator is connected to a loudspeaker. A meter away from the loudspeaker the sound pressure level (SPL) is 10 dB. Diminishing the frequency of the generator without changing the amplitude, at 1 kHz 30 dB SPL is measured, while further decreasing the frequency to 100 Hz, the SPL will be 0 dB. a) What is the loudness level of the 10 kHz signal in phon? b) What is the loudness level of the 1 kHz sound in phon? c) What is the loudness level of the 100 Hz sound in phon? d) How you explain that the loudness levels are different while the output power of the generator was constant in all the above frequencies?

  3. The Fletcher–Munson curves ?

  4. Problem 3.2 Loudness of compound signals In an experiment we make a sound effect with two signals, a 1 kHz one with 60 phon loudness level and a 1.1 kHz one with 66 phon. a) Give the sound pressure of each signal in mPa! b) What is the joint loudness level of the above sound effect? c) What are the loudnesses of the signals in son? d) How many phon would be the loudness level of the whole sound effect if the frequency of the second sound were 10 kHz instead of 1.1 kHz?

  5. Critical bands

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