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Science > Acoustics 
non-stationary signal
Science; Acoustics
A signal whose frequency content changes within a captured time frame.
noise isolation class (NIC)
Science; Acoustics
A single number rating of the degree of speech privacy achieved through the use of an acoustical ceiling and sound absorbing screens in an open office. NIC has been replaced by ...
single number rating (SNR)
Science; Acoustics
A single number rating system for hearing protectors, set up by the EU, BS EN ISO 4869
noise reduction rating (NRR)
Science; Acoustics
A single-number rating system used to compare and label hearing protectors. For example the protected dBA = unprotected dBC - NRR.
noise reduction coefficient (NRC)
Science; Acoustics
A single-number rating system used to compare the sound-absorbing characteristics of building materials. A measurement of the acoustical absorption performance of a material, ...
hanning window
Science; Acoustics
A smooth amplitude weighting of a time signal with zero at the beginning and the end of the time record - 'bell shaped'. Commonly used in FFT analysis when analyzing gated ...
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