effects of the environment upon audible sound waves; may be broken down to Architectural Acoustics and Landscape Acoustics

(a)  

generation and detection of audible sound waves

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application of mechanical waves in basic scientific research, industry, and medicine.

(a)  

Form of energy propagated in waves which continue to subsist until filtered through a material turning into heat by friction.

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produced by the human voice

(a)  

produced by an instrument

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produced by impact, by vibrating bodies, even by speech or music

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Type of sound that is heard as perfectly as possible at the right level or loudness without pain or strain

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Type of sound which entails an annoyance factor

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Sound must always have a source, a (a)   , and a receiver.

sound travels at 1130 ft. per second or 344 m. per second at normal room temperature (68°F); sound travels faster in denser media.

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rate at which sound energy is being transmitted, measured at any point in the medium; intensity diminishes inversely as the square of the distance.

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the unit in which sound intensity is defined for architectural purposes

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instrument by which sound intensity is measured

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– the fluctuation in the atmospheric pressure caused by the vibration of air particles due to a sound wave

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subjective attribute of an auditory sensation in terms of which sounds may be ordered on a scale of soft to loud.

(a)  

minimum intensity that can evoke an auditory sensation in the ear.

(a)  

minimum sound pressure level which stimulates the ear to a point which is painful

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the number of displacements or oscillations that a particle undergoes in 1 second.

(a)  

unit of frequency; numerically equal to cycles per second

(a)  

the attribute of an auditory system which enables us to pinpoint sounds on a scale extending from high to low frequency.

(a)  

sound sensation having pitch

(a)  

the distance a sound wave travels during each complete cycle of vibration measured in meters or feet.

(a)  

sound sources radiate sound waves in all directions; radiation pattern varies with the frequency; high frequency sounds are more pronounced along the longitudinal axis of the sound source.

(a)   OF SOUND SOURCES.

particles of sound tend to follow cold air

(a)  

if heavy, (a)   can act as a reflecting surface

may change the direction of sound

(a)  

can also act as a reflecting surface

(a)  

sound reflected off a surface, usually one which is hard, rigid and/or flat

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sound waves absorbed into a material upon contact; change of sound energy into some other form

(a)  

occurs when sound waves are dispersed equally in a room

(a)  

acoustical phenomenon which causes sound waves to be bent or scattered around such obstacles as corners, columns, walls, beams, etc.

(a)  

change of sound wave direction as it moves from one medium to another of different density

(a)  

sound which penetrates through a surface

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the prolongation of sound as a result of successive reflections in an enclosed space after the source of sound is turned off

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sound waves which have been reflected to a listener with sufficient magnitude and time delay so as to be perceived separately from those communicated directly from the source to the listener.

(a)  

similar to echo except that the time delay between the perception of direct and reflected sounds is somewhat less.

(a)  

a rapid succession of noticeable small echoes observed when a short burst of sound is produced between parallel sound reflective surfaces

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sound reflections from concave surfaces concentrating in an area sometimes referred to as hot spots. The intensity of sound at hot spots are always at the expense of dead spots.

(a)  

two rooms adjacent to each other by means of open doorways, with at least one space being highly reverberant.

(a)  

an undesirable change in the quality of musical sound due to the uneven and excessive sound absorption of the boundary surfaces at different frequencies.

(a)  

also called Coloration. Occurs when certain sounds within a narrow band of frequencies tend to sound louder than other frequencies.

(a)  

occurs when an area does not receive an adequate amount of direct and reflected sound.

(a)  

high frequency sounds creeping along large concave surfaces such as a hemispherical dome.

(a)  

Disturbance that travels through medium form one location to another

(a)  

Vibrating at right angle. Perpendicular to vibration direction

(a)  

Vibrating back and forth. Waves direction parallel to vibration reaction

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CONSISTS OF ONLY A SINGLE FREQUENCY. IT'S WAVE FORM IS A PURE SINE WAVE.

(a)  

NOT A PURE SINE WAVE BUT IT IS PERIODIC-- IT HAS AN UNDERLYING PATTERN THAT REPEATS.

(a)  

HIGHEST OR ANY RESONANT FREQUENCY ABOVE THE FUNDAMENTAL FREQUENCY OF A SOUND.

(a)  

THE LOWEST, BASE, OR CORE, FREQUENCY OF A SOUND IS KNOWN AS ITS FUNDAMENTAL TONE. THE WAVEFORMS OF ALL SOUNDS, APART FROM A BASIC SINE WAVE, CONSIST OF THE FUNDAMENTAL TONE AND MANY OTHER TONES OF DIFFERENT FREQUENCIES.

(a)