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2014-01-30 03:19:03
psychology music sound

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  1. wave fronts
    The shape or configurations of the component compressions and rarefactions as they diffuse through a medium.
  2. diffusion
    The dissipation of sound energy or weakening of wave trains as they travel through a medium.
  3. refraction
    The bending of wave fronts as they pass through media having unequal or varying density.
  4. diffraction
    The spreading of wave fronts into areas behind or around physical barriers.  Stated the other way: the filling-in of area spaces behind physical barriers that are blocked and not in a straight shot from the sound source.
  5. beats
    The periodic reinforcement and cancellation of two wave fronts with frequencies closer together than 20 Hz.
  6. difference tones
    The periodic reinforcement and cancellation of two wave trains with frequencies further apart than 20 Hz may be perceived as a third tone whose frequency is the difference between frequencies of the original tones.
  7. summation tones
    Subjective tones produced by the ear that are perceived as the sum of two external frequencies.  Summation tones, if heard at all, are heard best when they occur near the middle of the audible frequency spectrum.
  8. subjective tones
    Tones that do not exist in the environment, but by forcing parts of the ear into non-linear vibration, are created within the ear itself.
  9. reverberation
    The perceived phenomenon of multiple echoes mixing with the primary sound.
  10. absorption
    The trapping of sound waves in fibrous or porous materials which weakens the wavefront by reflecting and diffusing sound energy.
  11. insulation
    Preventing sound waves from traveling through physical barriers.  This may be accomplished by various combinations of reflection, absorption, diffusion, or by creating a barrier that will not transmit vibration.