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35 terms

Sound Design Unit 1

STUDY
PLAY
Hertz
represents the number of waves emitted/wave cycles per second (frequency)
sine wave
simplest waveform, represents a pure tone, one that contains only a single frequency of vibration
timbre
the particular quality of a sound
harmonies
various frequency components that make up timbre
complex sounds
contain internal variations in magnitude and direction of pressure change
phase
position of a waveform in time
If waveforms rise and fall in synchrony, they are
in phase
if waveforms do not rise and fall in synchrony, they are
out of phase
envelope
the variation of the amplitude of the sound energy plotted against the duration of the sound
Attack
Rise time of the sound. Typically short compared to sustain and release times
Decay
Sound energy drop time. Typically very short compared to Sustain and Release times
sustaining level
the average intensity maintained while the sound source continues to supply energy to generate vibrations in the surrounding air
Sustain
Period during which source supplies energy to maintain sound. Typically, very long--1 second to several minutes
Release
Time required for sound to drop from sustaining level to inaudibility. May be very short or very long. Affected by reverberance of environment.
ADSR
another name for the Envelope, the initials of the names of each subperiod
Radiator
projects the voice forward, but does not enhance weaker pressure waves, which dissipate rapidly
Resonator
contacts a large amount of air, increasing the intensity of the tuning fork
open field
space with no boundaries
closed field
space that is partly or completely limited by boundary surfaces
reverberation
multiple reflections of sound off of barriers
reverberation time
duration of reflections
live space
space with a long reverberation time
dead space
space with little or no reverberation time
ring modes
frequencies at which a room tends to resonate
resonate
to vibrate or sound in a way similar to something else
Doppler effect
change in the apparent frequency of a wave as observer and source move toward or away from each other
Direct Current (DC)
electric current that flows in a single direction, from the negative terminal to the positive terminal of a battery when connected to an external circuit
Alternating Current (AC)
cyclical alteration in direction of current flow
Alternators
devices that produce AC by reversing polarity a given number of times in a second
current flow
free electrons move through circuit from negative terminal of voltage source, through circuit, returning to the positive terminal of the source
source of electrical pressure
the force which frees electrons from atoms, causing concentration of positive ions at one terminal of source and concentration of electrons at opposite terminal. Force used to separate electrons and ions is usually chemical (battery) or magnetic (generator)
resistance
any element which restricts passage of electrons thereby limiting the flow of current through the circuit
Ohm's law
the relationship of voltage, current and resistance in a circuit I = V/R (I=E/R)
Watt's Law
Watts = Amps x Volts (P=IE)
grounding
returning a circuit to earth