40 dB Equal Loudness Contours and A-Weight
Lp
??
40 dB Equal Loudness Contour
normalized to 0 dB at 1kHz
(dB)4020020 Hz
40Lp
??
1001 kHz10 kHz
40 dB Equal Loudness
Contour inverted
-20and compared
with
A-weighting-40
(dB)0
40A-weighting20 Hz
BA 7666-11, 41
1001 kHz10 kHz
Frequency Weighting Curves
Lp
[dB]0
D-20
AB-40
CB + CALin.D-60
10
20
50
100
200
500
1 k
2 k
5 k
10 k20 k
Frequency[Hz]
BA 7666-11, 42
Calibration and Weighting!
Lp
[dB]0
?L= 8.6dB-20
-40
A-weighting-60
10
20
50
100
200
500
1 k
2 k
5 k
10 k20 k
Frequency[Hz]
BA 7666-11, 43
Conclusion
??????
Sound pressure level in dB is related to 2 * 10-5Pascal.The range of human hearing is 130 dB.
To add or subtract dB-values use charts or formulas
BA 7666-11, 44
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