The Physical Nature of Musical Sound

Red keys: A-220, A-440, A-880. Yellow key: E-660

Our ears detect changes in volume in a non-linear fashion. A decibel is a logarithmic scale of loudness. A difference of 1 decibel is perceived as a minimum change in volume, 3 decibels is a moderate change, and 10 decibels is perceived by the listener as a doubling of volume. Decibels are designated by the letters: dB.

Pure sine wave vibration
Vibration of a tight metal string
Video 1
Video 2

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