Speech Science-CMD 376
Terms
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- SOUND
- Series of vibrations of molecules in a medium
- What are mediums?
-
Gas (air)
Liquid (underwater)
Solids (dividers in classrooms) - Amplitude
- Strength of vibration of molecules
- PEAK AMPLITUDE
- The amount of amplitude at max. points of displacement
- PEAK-PEAK AMPLITUDE
- Amplitude from 1 point of max. displacement to another [add together-take absoulute value].
- RMS AMPLITUDE
- [Root Mean Average]
- INSTANTEOUS AMPLITUDE
- The measure of amplitude at any point in time along the wave.
- For sine waves to find RMS Amp.
- Peak Amp * .707 (1/2 sq. rt of 2 )
- Starting Phase
- where vibrations begin in degress
- Instant. Phase
- Measure of phase on any point on wave.
- Wavelength
- The distance between 2 consecutive pos. peaks or neg. peaks on a sine wave
- How many cycles is completed in 1 second?
- 2
- 1 cycle is how many seconds?
- 0.5
- Wavelength is affected by what?
- Frequency and speed of sound in air
- Intensity
- A measure of sound strength
- Types of Decibels
-
dBSPL
dBIL
dBSL
dBHL - dBSPL
-
Decibel Sound Pressure Level
{ reference pressure } - dBIL
-
Decibel Intensity Level
{ Power } - dBSL
-
Decibel Sensation Level
{Comp. of 1 decibel lever to another } - dBHL
-
Decibel Hearing Level
{ Clinical Decibel } - dBSPL Needs what?
-
Measure pressure
Reference Pressure - What amplitudes are independant and which are time???
-
Instanteous (TIME)
PEAK ind.
PEAK-PEAK ind.
RMS ind. - Cycle of Increased Pressure
- Compression Phase
- Cycle of Decreased Pressure
- Rarafaction Phase
- Describing SHM (simple harmonic motion)
-
Frequency
Period
Amplitude
Phase
Wavelength - Frequency
-
# of cycles per second of time.
Units= Hertz (Hz) - Period
-
Amount of time it takes to complete 1 cycle
Units=Time (T) - Inertia
- Force must be acted on an object to make it move
- Elasticity
- Ability of an object to return to initial position after movement
- Max. Displacement
- How much an object can go to (how Far)