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Sound for Media

Unit 1 Key Terms

Sound Wave Molecules that pass on their energy to adjacent molecules, starting a reaction.
Elasticity The phenomenon in which a displaced molecule tends to pull back to its original position after its initial momentum has caused it to displace nearby molecules.
Compression Continues away from the object as the momentum of the disturbed molecules displaces the adjacent molecules, producing a crest in the sound wave.
Rarefraction When a vibrating
Frequency The number of cycles that a vibration completes in one second.
Cycles per Second (cps) proportion to Hertz (Hz): 1:1 Ex) If a vibration completes 50 cps then its frequency is 50 Hz.
Infrasonic The range below the frequencies audible to human hearing.
Ultrasonic The range above the frequencies audible to human hearing.
Pitch The relative tonal highness or lowness of a sound.
Fundamental Frequency The lowest , or basic, pitch of a musical instrument. Also called first harmonic or primary frequency.
Sound Frequency Spectrum The range of audible frequencies.
Octave The interval between any two frequencies that have a tonal ratio of 2:1. Grouped into: Bass, Midrange, and Treble.
Masking The hiding of some sounds by other sounds when each is a different frequency and they are presented together.
Velocity Speed of a sound wave.
Wavelength The length of one cycle of a sound wave. Is inversely proportional to the frequency of a sound: the higher the frequency, the shorter this is.
Psychoacoustics The study of human perception of and subjective response to sound stimuli.
Reflected Sounds Sound that reaches our ears after bouncing off one or more surfaces.
Haas Effect A sound reflection arriving up to 30 ms after the direct sound must be about 10 dB louder to be audible, resulting in the direct and reflected sounds being perceived as one.
Created by: 4Dubois



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