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Science > Acoustics

facade level
Science; Acoustics

Noise levels measured at 1 meter from a building and includes the noise reflected from the building.

noise and number index (NNI)
Science; Acoustics

Noise unit developed in the 1960s for rating aircraft annoyance. NNI = L + 15 x Lg N - 80 where L is the log average peak PNdB noise level and N is the number of aircraft ...

gaussian noise
Science; Acoustics

Noise with a statistically random time distribution - white noise for example.

auditory masking
Science; Acoustics

Occurs when the perception of one sound is affected by the presence of another sound .

classes
Science; Acoustics

Octave and third-octave filters used for sound level measurements are also required to meet classes 0, 1 or 2.

formant
Science; Acoustics

Of a complex sound, range of frequencies in which there is a local maximum in the sound spectrum.

partial
Science; Acoustics

One of a group of frequencies, not necessarily harmonically related to the fundamental, which appear in a complex tone. Bells and other percussion instruments have rich partials ...

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