psychoacoustics

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Author:
jacwill
ID:
259585
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psychoacoustics
Updated:
2014-02-01 12:37:27
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  1. what is psychoacoustics
    branch of psychophysics that deals with the quantification of sensation and the measurement of the psychological correlates of the physical stimulus
  2. what does sound consist of
    physical and psychological properties
  3. physical aspects of sound
    • frequency
    • intensity
    • physical is a series of disturbances of molecules within and propogated through an elastic medium such as air
  4. psychological properties
    • pitch
    • loudness
    • sound quality
    • directionality
    • psychological is the actual act of hearing something
  5. what is sound generated by
    • vibrations
    • ¬†carried through air in the form of pressure waves
    • we sense sound pressure and we convert them to electrical impulses and the send them to our brain where they interpret sound
  6. compression and rarefaction
    • compression brings things together
    • rarefaction pulls apart
  7. amplitude
    • refers to the difference between max and min pressure
    • how far a body vibrates or the distance the mass moves from the point of rest
  8. wavelength
    the physical distance between successive compression and is thus dependent on the speed of sound inthe medium divided by its frequency
  9. frequency
    • the number of peak to peak fluctuations in pressure that pass a particular point in space in one second
    • determines the pitch of the sound
    • =pitch
  10. velocity
    the speed of travel of the sound wave and depends on temp
  11. material speed of sound (m/s)
    air 343 at 20 c
  12. what does one cycle consist of
    • composed of a compression and rarefaction
    • one second=number of cycles=frequency or cycles per sec
    • cycles per sec= Hz
  13. pure tone
    • one freq of vibration with no tones superimposed
    • rare in nature
  14. what is the normal hearing range at birth
    20-20000 hz
  15. human ear is most sensitive to freq range between...
    500-4000
  16. intensity
    • physical measurement of strength or magnitude of a sound
    • determined by the amout of force applied to moving air molecuels
    • greater force causes larger sound wave
  17. what type of notation is dB
    • logarithmic its a ratio
    • utilizes a log
    • non linear
    • reference level must be specified
    • ¬†realtive unit of measure
    • exponent
  18. what happens if intensity reference and intensity output are the same
    • the ratio is 1:1=0
    • 0dB does not mean that there is no sound but rather that the intensity output of the same as the intensity reference.
  19. what is the sound pressure ref in physics and acoustics
    • use to be .0002 dyne
    • now its 20 uPA=0 dB sound pressure level (spl)
  20. what is the threshold of pain
    140 dB SPL
  21. Hz
    CPS
    SPL
    HL
    SL
    IL
    • HERTZ (FREQ)
    • CYCLES PER SECOND
    • SOUND PRESSURE LEVEL
    • HEARING LEVEL
    • SENSATION LEVEL
    • INTENSITY LEVEL
  22. loudness sensation
    • duration of sound
    • freq of sound
    • grows faster for low and high freq than for mid freq tones
    • phon is the unit of loudness
  23. localization
    results from the interaction of both ears

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