utilities

31問 • 12ヶ月前

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The opposite of reflection. Sound absorption results from the conversion of sound energy into another form, usually heat or motion, when passing through an acoustical medium. When a sound wave encounters resistance, absorption occurs.

absorption

Ratio of sound absorbing effectiveness, at a specific frequency, of a unit area of acoustical absorbent to a unit area of perfectly absorptive material. The portion of energy absorbed when a sound wave strikes a material. The absorption coefficient of a material is dependent on the frequency of the sound wave.

absorption coefficient

A porous architectural material, usually constructed from fiberglass or pressed board, which is most absorptive at the high frequencies.

acoustical tile

The sound characteristics of a room. The science of the production, control, transmission, reception and effects of sound and the phenomenon of hearing.

acoustics

The residual “room sound” of a listening environment

ambience

All pervasive noise associated with a given environment

ambient noise

Analog representations of sound replicate its waveform, while transferring it through different media. All sound is analog. Audio may be analog or digital.

analog

- Literally “without echo”

anechoic

- Due to exposed edges and diffraction of sound energy around perimeters, acoustical materials spaced apart can exhibit greater absorption than same amount of material with no gaps. The surface of an anechoic wedge has a total surface area greater than the flat surface it replaces.

area effect

A measure of the intelligibility of speech.

articulation

To reduce the level (volume, loudness, energy) of an acoustical (or electrical) signal.

attenuate

A frequency that falls within the range of the human hearing, usually taken as 20 Hz to 20 kHz

audio frequency

The ambient noise level above which signals must be presented or noise sources measured.

background noise

A device used to inhibit the propagation of sound waves

baffle

Heavy, dense and massive material used to block sound

barrier

Listening term that usually refers to an excessive amount of low frequency (bass) energy.

boomy

An acoustical panel suspended in a horizontal position from ceiling or roof structure.

ceiling cloud

The frequency of an electrical signal or sound wave, measured in Hertz (Hz).

cycles per second

The length of time taken for a signal to drop in strength to a specific portion of its initial value.

decay rate

The measuring unit of sound pressure, and hence loudness. T

decibel

The bending of a sound wave around an obstacle, or through an opening, such as slats. The scattering of sound waves at an object smaller than one wavelength, and the subsequent interference of the scattered wavefronts.

diffraction

The apparent shift in frequency when the sound source, or the observer, is in motion

doppler effect

A distinctly discernible reflection, or repetition of a source signal. Note: The term is often used incorrectly to refer to reverberation which consists of densely

echo

The term used to describe an even frequency response in which no frequency is accentuated.

flat

The noise heard as a result of vibrations transferred through the structure of a room. Foot thumps are impact noise.

impact noise

Unwanted sound. Interference of an electrical or acoustical nature. Random noise is a desirable signal used in acoustical measurements. Pink noise is random noise whose spectrum falls at 3 dB per octave. It is useful for use with sound analyzers with constant percentage bandwidths.

noise

- The sympathetic vibration of an object (or air column) at a specific frequency when it is excited into motion by a sound wave of similar frequency in the immediate vicinity.

resonance

The persistence of sound in an enclosure after a sound source has been stopped. This is a result of the multiple reflections of sound waves throughout the room arriving at the ear so closely spaced that they are indistinguishable from one another and are heard as a gradual decay of sound. The area in which this occurs is the Reverberation Field.

reverberation

- A measure of sound absorption of a surface

sabin

- Energy that is transmitted by pressure waves in air

sound

t usually a circular, hemispherical, elliptical or ellipsoidal enclosure, often beneath a dome or a vault, in which whispers can be heard clearly in other parts of the gallery

whispering gallery effect

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KRYZL CHARYNE MICU · 54問 · 1年前

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