# CDO 463 1 Basic Acoustics

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1. sound narrow definition
sensation for hearing
physical quantity with vibration - periodic or aperiodic - and a pressure disturbance - compressions and rarefractions - and a medium - material for transmitting the sound
3. periodic
• regularly repeating
• ex) tone
• repeats the same frequency
4. aperiodic
• not reguarly repeating
• 2 types - turbulent and static
• ex) noise, bullistic, release of stop consonants
5. Simple Harmonic Motion
tuning fork
• produces the simpliest type of sound
• tine movement : X-Y-X-Z-X-Y-X-Z-X
• one cycle: X-Y-X-Z-X
6. Period / frequency
• amount of time for one cycle / # cycles per second
• frequency = 1/period or f=1/T
• physical dimension - observable and measurable
• Hz
7. pitch
the perception of frequency
8. relationship between frequency/period and pitch
• increase in frequency = increase in pitch
• not a 1:1 change/dimension
• same physical change does not equal the same perceptual change
9. amplitude
• force or pressure of sound
• related to displacement of tine
10. loudness
• perception of amplitude
• decibel dB
11. relationship between amplitude and loudness
• increase in amplitude = increase in loudness
• not a 1:1 dimension
12. Simple Harmonic Motion
Uniform Circular Motion
• another type of SHM
• point P moves around circle at a uniform speed
• at each new P, a new radius r' is drawn that forms an angle (theta) with the original r
• by the time P goes around the circle, theta will go from 0 to 360 degrees
13. phase refers to
the angle of theta
14. period
time for one revolution
15. frequency
# cycles/second
16. amplitude
17. Amplitude (X) varies with
• the sine of theta
• X = r * sine
18. waveform
• graph of displacement as a function of time
• the waveform associated with SHM is the sine wave because the formula contains the sine function
19. spectrogram includes
• time
• amplitude
• frequency
20. spectrum includes
• amplitude
• frequency
21. Simple Harmonic Motion
Pendulum
• velocity is zero / movement stops at the extremes
• velcoity is at its max at the point of rest
22. amplitude graph vs. velocity graph
the amplitude graph is alays 90 degrees behind the velocity graph
23. superpositioning of sound waves
• go point by point on the x axis and add the y axis numbers together
24. adding sine waves of equal frequency results in
• a sine wave with the same frequency
• creates simple waves
25. adding sine waves of different frequencies results in
• complex waves - any wave that is not a sine wave
• a wave with more than one frequency component
26. square waves are formed by
adding the odd multiples of a given frequency
27. the fundamental frequency is
• the lowest frequency
• largest comon multiple in a series of frequencies
28. harmonics
frequencies that are integer multiples of the fundamental frequency
 Author: shanamd2011 ID: 169879 Card Set: CDO 463 1 Basic Acoustics Updated: 2012-09-09 21:57:52 Tags: Basic Acoustics Folders: Description: Basic Acoustics: Sound Generation and Propagation Show Answers: