ACOUSTICS TERMINOLOGIES Flashcards
(17 cards)
Sound or noise radiated directly from a source (e.g., loudspeaker, machine) into the surrounding air.
Airborne Sound
The total noise present in a specified environment.
Ambient Sound
The range of sound frequencies normally heard by the human ear (typically 20 Hz to 20,000 Hz).
Audible Frequency Range
A unit for expressing the relative intensity of sounds, ranging from zero (threshold of hearing) to about 130 dB (average pain level).
Decibel (dB)
The process where an acoustic wave is disturbed, causing its energy to redistribute due to an obstacle in its path.
Diffraction
Sound that reaches a location via straight-line propagation from the source.
Direct Sound
The repetition rate of a sound wave, measured in cycles per second (Hz).
Frequency
Unwanted sound.
Noise
The difference in sound pressure level between two points along the path of sound propagation.
Noise Reduction (NR)
The redirection of sound waves caused by changes in the wave velocity (e.g., bouncing off surfaces).
Reflection
The persistence of sound in an enclosed space due to repeated reflections at boundaries.
Reverberation
A unit of acoustic absorption, equivalent to the absorption by 1 square meter of a perfect
Sabin
The process of converting sound energy into heat, reducing sound pressure levels.
Sound Absorption (1)
The sensation perceived by the sense of hearing.
Sound Absorption (2)
The reduction of sound transmission by a solid partition between source and receiver.
Sound Insulation
Materials designed to minimize sound transmission when used as partitions.
Sound Insulating Materials
The sound energy flow per unit area in a given direction, measured in watts per square meter (W/m²).
Sound Intensity
