CHAPTER 1

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Author:
brianbauer78
ID:
258073
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CHAPTER 1
Updated:
2014-01-25 21:45:34
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psychology sound science music
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CHAPTER 1
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  1. vibration
    Any form of to-and-fro motion.
  2. sound
    A perceived, aural psychological sensation produced by vibration.
  3. sine wave
    A graph of the simplest form of vibration showing motion in time and space.
  4. sine tone
    The sound produced by sinusoidal vibration or oscillation.
  5. synthesizer
    An electronic music instrument that uses select tones, amplifiers and filters to create new musical sounds.
  6. simple harmonic motion
    Simple vibration.  The motion takes place in a straight line and is periodic, i.e., the motion repeats itself in equal periods of time even though the distance traveled gets shorter and shorter.  The motion is fastest as the body passes its center point of rest, and has moments at each extreme at which it is motionless.  SHM is perceived as a pure tone and results in a sine wave when graphed.
  7. elasticity
    The tendency of a displaced body to return to its point of rest.
  8. momentum
    The tendency of a displaced body to overshoot its point of rest.
  9. frequency
    The number of cycles (complete vibrations) which take place in a fixed period of time.  An acoustical definition of frequency is the number of sound waves passing a given point in one second.
  10. resonant frequency
    The frequency at which a body tends to vibrate due to its natural characteristics of size, shape, molecular composition, and the stress the body is under
  11. pitch
    Our perception of frequency.  The greater the frequency, the higher the perceived pitch.
  12. amplitude
    The distance through which a vibrating body moves.  That is, the amount of displacement of a vibrating body.
  13. loudness
    Our perception of amplitude.  The greater the amplitude, the louder the perceived sound.  This is tempered somewhat by the fact that we do not hear equally well at all frequencies.
  14. hearing loss
    The inability to perceive certain frequencies and amplitudes which are within the common limits of perception.
  15. cent
    One hundredth of a chromatic semitone.  It is the unit most commonly used to represent pitch deviation.
  16. decibel
    A unit of sound intensity.  The expression of intensity in dB (abbreviation) is a relationship between the sound being measured and a reference intensity upon which the sound level meter is calibrated.
  17. transmitting media
    A transmitter of vibration from a sound source to a receiver (the ear or a microphone).  Mediums must also be elastic in order for a vibration to take place.
  18. compression
    A point in space where a number of molecules which have been set into motion in effect bunch up causing an unusual number of molecules to occupy the same space.
  19. rarefaction
    A point at which the usual number of molecules which occupy a given space are temporarily out of position, causing a partial vacuum to occur.
  20. reflection
    The bouncing back of sound waves as they strike a surface more dense than that which they are traveling.
  21. echoes
    Sound waves which have been reflected.
  22. resonance
    The transmission of vibrations from (sympathetic vibration) one body to another (usually through air).  The frequency of the first body must be exactly or very nearly the natural frequency of the second body.

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