represents the number of waves emitted/wave cycles per second (frequency)
simplest waveform, represents a pure tone, one that contains only a single frequency of vibration
the particular quality of a sound
various frequency components that make up timbre
contain internal variations in magnitude and direction of pressure change
position of a waveform in time
If waveforms rise and fall in synchrony, they are
if waveforms do not rise and fall in synchrony, they are
out of phase
the variation of the amplitude of the sound energy plotted against the duration of the sound
Rise time of the sound. Typically short compared to sustain and release times
Sound energy drop time. Typically very short compared to Sustain and Release times
the average intensity maintained while the sound source continues to supply energy to generate vibrations in the surrounding air
Period during which source supplies energy to maintain sound. Typically, very long--1 second to several minutes
Time required for sound to drop from sustaining level to inaudibility. May be very short or very long. Affected by reverberance of environment.
another name for the Envelope, the initials of the names of each subperiod
projects the voice forward, but does not enhance weaker pressure waves, which dissipate rapidly
contacts a large amount of air, increasing the intensity of the tuning fork
space with no boundaries
space that is partly or completely limited by boundary surfaces
multiple reflections of sound off of barriers
duration of reflections
space with a long reverberation time
space with little or no reverberation time
frequencies at which a room tends to resonate
to vibrate or sound in a way similar to something else
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
devices that produce AC by reversing polarity a given number of times in a second
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)
any element which restricts passage of electrons thereby limiting the flow of current through the circuit
the relationship of voltage, current and resistance in a circuit I = V/R (I=E/R)
Watts = Amps x Volts (P=IE)
returning a circuit to earth
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