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1. Acoustics

   Linked via "Fletcher-Munson curves"

   Psychoacoustics investigates the human perception of sound, linking physical properties (like intensity and frequency) to subjective sensory experiences. The human ear is capable of detecting frequencies ranging from approximately 20 Hz to 20,000 Hz under ideal laboratory conditions.
   A key concept in this field is the Phon (loudness level), which is measured in phons and attempts to normalize perceived loudness across di…