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  • acoustics

    the science and technology oh how sound behaves

    beats

    the pulsations of sound produced when two similar frequencies interfere with each other

    cochlea

    a tiny, fluid-filled bone structure in the inner ear that contains the essential organs of hearing

    consonance

    a harmonious or agreeable combination of frequencies heard when sounds are played simultaneiously

    decibel

    the dimensionless unit of a logarithmic scale for expressing the relative intensity of sounds

    dissonance

    an unpleasant combination of frequencies heard when sounds are played simultaneously

    Doppler effect

    the change in the observed frequency of a wave due to the relative motion of the source and observer

    Fourier's theorem

    states that nearly every wave can be expressed by superimposing single frequency waves

    frequency spectrum

    a graphic representation showing the relative contribution to an overall sound made by each component frequency

    microphone

    a device that transforms sound waves into electrical signals for the purpose of transmitting or recording sound

    musical scale

    a series of musical notes arranged from low to high in a special pattern

    note

    a frequency in a musical scale; a sound with a certain duration and pitch; it is based on a single fundamental frequency and may include harmonies and other related frequencies

    octave

    a frequency difference that is double or half the starting frequency

    pitch

    the property of a sound determined by the frequency of the waves producing it; the highness or lowness of a sound

    pressure

    the force exerted per unit area; fluid pressure acts in all directions

    reverberation

    multiple reflections of sound building up and blending together

    rhythm

    the organization of a sound into regular time patterns

    shock wave

    the compressed wave fronts that form in front of a supersonic object; the wavefronts form a boundary between sound and silence

    sonogram

    a graphic representation of sound showing frequency, time, and intensity

    speaker

    a device that converts electrical signals into sound; used to reproduce sound accurately

    stereo

    a method of sound reproduction involving multiple speakers to approximate the spatial distribution of the original sound

    subsonic

    motion that is slower than the speed of sound in air

    supersonic

    motion that is faster than the speed of sound in air

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