PDX_26_Acoustics Vocabulary Flashcards
Any unwanted sound
Noise
Energy produced by vibrating medium transmitted as a wave through an elastic medium
Sound
Generated by a vibrating object and radiated outward from the source equally in all directions
Soundwaves
Measure frequency, has been replaced by hertz (HZ)
Cycles per second
Number of cycles of compression and expansion completed per second, and measured in hertz (HZ)
Frequency
Sounds depends on the medium it travels through and the temperature of that medium
Velocity
Increased intensity of sound by mechanical or electrical means
Amplification
Intensity of sound of the given location, and watts per square meter
Intensity level
The overall quality of the sound with reference to its quality, pitch, strength, source
Tone
The order of sounds on the frequency related scale
Pitch
measure of sonic energy per time, measured in watts
Sound power
The local pressure deviation from the ambient atmospheric pressure caused by a soundwave
Sound pressure
Sounds power per-unit area
Sound intensity
Unit of sound intensity devised to describe sound magnitude
Decibel (DB)
Unit of sound intensity measurement that is waited to account for the response of the human ear to various frequencies
dBA
The change in decibel levels
Loudness
A measure of speech intelligibility calculated from the number of words read from a selective list better understood by an audience
Low: 0.6, good for communication.
Articulation index
The reduction of sound
Attenuation
A scaler representation of the amount of sound energy absorbed upon striking a particular surface. It’s an arithmetic average of the sound of absorption capacity of a product at only four frequencies: turn 50, 500, 1000 and 2000 Hz, which represents the center range of human speech.
Noise reduction coefficient (NRC)
I was that occurs when an object comes into direct contact with the barrier, typically either the floor or ceiling assembly
Impact noise
Single number of the measures of floor/ceiling assembly’s resistance to the transmission of structure born or impacts noise.
Impact isolation class (IIC)
Where sound passes around, over-the-top, or under the partition separating two spaces.
Flanking transmission
Is a measure of the amount of sound generated by a source independent of its environment
Sound power level (PWL)
Sound pressure at a location expressed in newtons per square meter
Sound pressure level (SPL)
Single number system for specifying a maximum SPL level in a given location using standardized reference contours. Curves weight the frequencies to which the human ear is sensitive.
NC curves
