Axial mode
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Axial mode - The room resonances associated with each pair of parallel walls (including ceiling and floor).
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A-Weighted Sound Level
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A-Weighted Sound Level - A measure of sound pressure level designed to reflect the response of the human ear, which does not respond equally to all frequencies, by reducing the effects of the low and high frequencies with respect to the mid-range frequencies. The resultant sound level is said to be A-weighted, and the units are dBA.
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Audio frequency
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Audio frequency - A frequency that falls within the range of the human hearing, usually taken as 20 Hz to 20 kHz.
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Attenuate
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Attenuate - To reduce the level (volume, loudness, energy) of an acoustical (or electrical) signal.
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ASTM E 84
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ASTM E 84 - A test method for determining the surface burning characteristics of building materials, sometimes referred to as the “Steiner tunnel test”. This test method is for single products and evaluates both flame spread and smoke development, assigning different classes based upon test results:
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Articulation
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Area Effect
Analog
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Analog - Analog representations of sound replicate its waveform, while transferring it through different media. All sound is analog. Audio may be analog or digital.
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Ambient noise
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Ambient noise - All pervasive noise associated with a given environment.
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Ambience
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Ambience - The residual “room sound” of a listening environment.
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