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41 Cards in this Set
- Front
- Back
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What is the relationship between how well sound travels and the stiffness of it’s medium?
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The stiffer the medium, the fast the sound travels. Although it takes more force to get it started.
Steel – 5800 m/s Water – 1500 m/s |
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What is the Speed of sound in both m/s and f/s?
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343 m/s
1125 ft/s |
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In what direction does sound propagate?
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Spherical
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Definition: Propagation
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To transfer
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Definition: Sound Propagation
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The process of air molecules compressing and rarefaction.
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Definition: Condensation/Compression
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When air molecules become closer to each other either before or after rarefaction
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Definition: Rarefaction
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The elasticity pulling air molecules back together after they experience compression.
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Definition: Static Pressure
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Constant Pressure
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Definition: Varation Pressure
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Fluctuating Pressure
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Definition: Elasticity
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A resting force. It is the ability of the object to assume to original position once the force has been removed
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Definition: High Frequency
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Many cycles per second
Associated w/ bright, treble sounds |
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What makes sound possible?
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The vibration of molecules.
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Definition: Inertia
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The tendency for an object at rest to stay resting
The tendency for an object in motion to stay in motion Vibrating molecules cause an outward chain reaction. |
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How does sound travel through the air?
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Vibrating molecules cause an outward chain reaction.
EX: Similar to Newtons Cradle |
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What is a sound medium?
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Any object/material that sound waves can travel though.
Ex: Air, Water, Steel |
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Definition: Frequency
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The number of cycles per second (Hertz)
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Definition: Cycle
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An alternate compression and rarefaction
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Definition: Period
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The time it takes for once cycle (or one complete pattern repetition).
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Definition: Wavelength
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the distance covered by one cycle
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Definition: Phase
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Phase: the point of the cycle reached at a particular time.
Ex: 90, 180, 270, 360 |
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Definition: Low frequency
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Few cycles per second
Associated w/ warm, bass sounds |
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Definition: Hertz
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Cycles per second
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What is the relationship between Hertz and Frequency?
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The higher the hertz the higher the frequency
The lower the hertz the lower the frequency |
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What is the equation to find Period if you know the Frequency?
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1/Frequency
i.e: 1/2000 Hz |
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What is the equation to find Frequency if you know the Period?
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1/Period
i.e: 1/.001 seconds |
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How many degrees to a phase?
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360 Degrees
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Why is phase important to hearing?
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Phase relationships determine how sounds occurring simultaneously will be added.
Ex: something 180 degree out of phase is canceled out |
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Definition: Amplitude
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The magnitude of the pressure variations—intensity
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Definition: Decibel
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The unit of measure for intensity
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Are decibels linear or exponential
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Exponential
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What are the three types of Decibels?
What do they stand for? |
SPL- Sound Pressure Level (w/o modification)
HL - Hearing Level (the norm where you hear the sound) SL- Sensation Level IL- Intensity Level |
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Definition: Aperiodic Complex Tones
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There is no repetition of a pattern
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Definition: Periodic Complex Tones
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Patterns of pressure variations that repeat over time
-All pure tones are periodic |
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Definition: Phase Spectrum
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The distribution of the phase (temporal alignment) of the pure tone components that make up sound
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Definition: Magnitude Spectrum
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The distributions of magnitudes of pure-tone components that make up sound.
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Definition: Fourier Analysis
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Breaking down the complex sound into its pure tone components
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What is the difference between pure tones and complex sounds?
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Complex Sound: multiple frequencies at various intensities
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Definition: Spectral Splatter
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Clicks/glitches from abruptly turning off the sound
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Definition: Spectro
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-A graph to show the “short-term” spectrum of sound changes
-a 3D plot showing intensity as a function of time and frequency |
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What is the unit of measurement for SPL?
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Dynes/cm2 or Pascals
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What is the unit of measurement for IL?
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Wats/m2 or water/cm2
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