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27 Cards in this Set
- Front
- Back
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Speed of sound
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1126 ft/sec
and 1 foot/millisecond |
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What makes the speed of sound vary?
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Humidity and temperature
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What is wavelength
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Distance traveled to complete one whole wave
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Amplitude
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How high and low the trough of a wave is
Also loudness |
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Doubling a sound wave does what?
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Halves its frequency
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Increasing an amplitude is
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Increasing volume
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Diffusion
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The scattering of sound and reflection into the air
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Absorption
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When sound strikes a barrier and the sound is absorbed
Absorbed energy turns into heat |
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Diffraction
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The ability of sound to move around barriers
Can only occur when the wavelength is larger than the barrier |
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Phase
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the comparison of two wave shapes, and where they are relative to each other
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Two waves that are 180 degrees out of phase
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You will hear nothing
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Polarity
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Identification of the single sine wave in whether it goes up or down first
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Positive polarity
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Wave goes up first
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Negative polarity
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Wave goes down first
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Fundamental
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The lowest frequency of a complex sound
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Harmonic
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Whole number multiple of the funamental
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How to find the harmonics?
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Multiply the fundamental by 1, 2, 3, 4, etc
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Transducer
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Any device that converts one form of energy into another
Ex. Mic, Lightbulb |
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Decibel (dB)
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Ratio measured against any constant
Used to measure volume |
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SPL
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Sound pressure level
Distance is what you have to know for SPL to mean something |
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When is something too loud?
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If you have to shout over it to be heard
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What does hearing damage feel like when it happens
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Feels like nothing
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Why not mix at louder volumes?
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Low end will sound louder than it would at a listenable level as well as high end too
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Which frequencies are hard to localize? Bass, Mid, High
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Bass
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Any reflection arriving within ___ ms is mixed in with the direct sound in our ear-brain?
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30 ms
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Name 2 Electrical insulators
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Styrofoam, rubber
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Name 2 electrical conductors
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Copper, silver
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