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  • Vibration

    Any form of to-and-fro motion

    Sound

    A perceived, aural psychological sensation produced by vibration

    Sine Wave

    A graph of the simplest form of vibration showing motion in time and space.

    Sine Tone

    The sound produced by sinusoidal vibration or oscillation.

    Synthesizer

    An electronic music instrument that uses select tones amplifiers and filters to create new musical sounds.

    Simple Harmonic Motion

    Simple vibration, the motion is in a straight line and is periodic (repeats itself in equal periods of time even thought the distance traveled gets shorter and shorter. The motion is fastest as it passes its center point of rest and has moments at each extreme when it is motionless. Perceived as a pure tone and results in a sine wave when graphed.

    Elasticity

    The tendency of a displaced body to return to its point of rest.

    Momentum

    The tendency of a displaced body to overshoot its point of rest.

    Frequency

    The number of cycles (complete vibrations) which take place in a fixed period of time. An acoustical definition is the number of sound waves passing a given point in one second.

    resonant frequency

    The frequency at which a body tends to vibrate due to its natural characteristics of size, shape, molecular composition, and the stress the body is under.

    Pitch

    Our perception of frequency. The greater the frequency, the higher this is.

    Amplitude

    The distance through which a vibrating body moves. The amount of displacement of a vibrating body.

    Loudness

    Our perception of amplitude. The greater the amplitude, the greater the perceived sound.

    Hearing Loss

    The inability to perceive certain frequencies and amplitudes which are within the common limits of perception.

    Cent

    1/100th of a chromatic semitone. It is the unit most commonly used to represent pitch deviation.

    Decibel

    A unit of sound intensity.

    Transmitting media

    A transmitter of vibration from a sound source to a receiver (ear or microphone). Must be elastic for vibration to take place.

    Compression

    A point in space where a number of molecules which have been set into motion bunch up causing an unusual number of molecules to occupy the same space.

    Rarefaction

    a point at which the usual number of molecules which occupy a given space are temporarily out of position, causing a partial vacuum to occur.

    Reflection

    The bouncing back of sound waves as they strike a surface more dense than that in which they are traveling.

    Echoes

    Sound waves which have been reflected.

    Resonance

    The transmission of vibration from one body to another, usually through air. The frequency of the first body must be very near the frequency of the second body.

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