331 2.1 Pure Sounds : Acoustics

Card Set Information

Author:
shanamd2010
ID:
129066
Filename:
331 2.1 Pure Sounds : Acoustics
Updated:
2012-01-19 18:40:43
Tags:
acoustics
Folders:

Description:
CDO 331
Show Answers:

Home > Flashcards > Print Preview

The flashcards below were created by user shanamd2010 on FreezingBlue Flashcards. What would you like to do?


  1. definition of sound
    vibrations propagated (produced) in an elastic medium
  2. sound has...
    serious emotional content
  3. sound needs
    source of vibration, force, medium, hearing mechanism
  4. sound is
    a disturbance of particles (atmosphere)
  5. condensation
    more molecules = more than atmospheric pressure
  6. rarefaction
    less molecules = less than atmospheric pressure
  7. simple harmonic motion
    • something constantly repeating itself (as in vibration)
    • ex) a circle constantly repeats itself
  8. you can not do anything with sound
    until you put numbers to it
  9. we can talk about sound in relation to
    a circle and a sine wave
  10. synonym of loudness
    intensity
  11. synonym of frequency
    pitch
  12. example of simple harmonic motion
    circle
  13. to make the sound louder
    make the circle bigger using diameter and radius
  14. to make the sound softer
    make the circle smaller using diameter and pitch
  15. to make the pitch higher
    rotate the circle faster
  16. to make the pitch lower
    rotate the circle slower
  17. what represents the rotation of the circle
    a sine wave
  18. sine wave y axis
    • Amplitude (volts)
    • Amp (v)
  19. sine wave x axis
    • time (seconds)
    • time (s)
  20. two aspects of sound to model
    • loudness (amplitude)
    • pitch (period and frequency)
  21. three sound amplitudes
    • Peak Amplitude (Ap)
    • Peak to Peak Amplitude (App)
    • RMS Amplitude (A rms)
  22. Ap and App are
    instantaneous
  23. final amplitude is
    an average
  24. finding final amplitude
    • S - square all #s
    • M - median
    • R - take square root
  25. Arms formula
    Arms = .707 x Ap
  26. pitch can be described by
    pitch or frequency
  27. period
    • time of 1 cycle of vibration
    • units are seconds or milliseconds
  28. frequency
    • number of cycles per second
    • units are Hertz (Hz)
  29. Heinrich Rudolph Hertz
    • German Physicist
    • 1857 - 1894
    • investigator of electromagnetic waves
    • theory behind radio (tv, cell phones, internet, etc)
  30. period and frequency are related
    • T = 1/F
    • F = 1/T
  31. in order to do the period and frequency formulas, time must be in
    • seconds
    • NOT milliseconds
  32. speed of sound depends upon
    the medium
  33. what determines if the sound will go through an object
    wavelength
  34. low frequencies go through objects because
    their wavelengths are longer
  35. wavelength formula
    • ^ = c/f
    • ^ = wavelength
    • c = speed of sound (ft/sec)
    • f = frequency
    • units = feet / cycle

What would you like to do?

Home > Flashcards > Print Preview