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Definition of "A Weighting" |
A weighted decibels, abbreviated dbA, or dba, or dB(a), are an expression of the relative loudness of sounds in air as perceived by the human ear. In the A weighted system, the decibel values of sounds at low frequencies are reduced, compared with unweighted decibels, in which no correction is made for audio frequency. This correction is made because the human ear is less sensitive at low audio frequencies, especially below 1000 Hz, than at high audio frequencies. |
Definition of "A-Weighting" |
A-weighting is a standard weighting curve applied to audio measurements, designed to reflect the response of the human ear. Sound-pressure levels derived using A-weighting are denoted by "dBA," or A-weighted dB levels. |
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