19 A 加權分貝(dBA)是以多少 phon 值的等響度曲線(equal loudness curve)做為運算加權(weighting) 的依據?
(A) 20 phon
(B) 30 phon
(C) 40 phon
(D) 10 phon

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統計: A(12), B(19), C(316), D(5), E(0) #1848149

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A:40phonB:70phonC:10...
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The A-, B-, and C-weighting networks were designed to roughly mirror the 40, 60, and 80 phon lines (turned upside down)
參考C-Weighting - an overview | ScienceDirect Topics

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