APPENDIX

D

A-, B-, C- andD-weightingcurves

377

Perceptua l Audio Eva lua t io n Theo ry, M etho d a nd Applica t io n Sren Bech and Nick Zacharovc 2006 John Wiley & Sons, Ltd. ISBN: 0-470-86923-2

378 Appendix D A-, B-, C- and D-weighting curves

Centre A-weighting B-weighting C-weighting D-weightingfrequency curve [179] curve [179] curve [179] curve [178]

(Hz) (dB) (dB) (dB) (dB)10 70.4 38.1 14.3 26.6

12.5 63.4 33.2 11.2 24.616 56.7 28.5 8.5 22.620 50.5 24.2 6.2 20.625 44.7 20.4 4.4 18.7

31.5 39.4 17.1 3.0 16.740 34.6 14.2 2.0 14.750 30.2 11.6 1.3 12.863 26.2 9.3 0.8 10.980 22.5 7.4 0.5 9.0

100 19.1 5.6 0.3 7.2125 16.1 4.2 0.2 5.5160 13.4 3.0 0.1 4.0200 10.9 2.0 0.0 2.6250 8.6 1.3 0.0 1.6315 6.6 0.8 0.0 0.8400 4.8 0.5 0.0 0.4500 3.2 0.3 0.0 0.3630 1.9 0.1 0.0 0.5800 0.8 0.0 0.0 0.61000 0.0 0.0 0.0 0.01250 0.6 0.0 0.0 2.01600 1.0 0.0 0.1 4.92000 1.2 0.1 0.2 7.92500 1.3 0.2 0.3 10.43150 1.2 0.4 0.5 11.64000 1.0 0.7 0.8 11.15000 0.5 1.2 1.3 9.66300 0.1 1.9 2.0 7.68000 1.1 2.9 3.0 5.510000 2.5 4.3 4.4 3.412500 4.3 6.1 6.2 1.416000 6.6 8.4 8.5 0.720000 9.3 11.1 11.2 2.7

Table D.1: One-third octave band free-field relative frequency responses forA-, B-, C- and D- weighting curves according to [178, 179]. Note that for eachrelative frequency response point there is an associated measurement tolerance,which can be found from the associated recommendation. Reproduced bypermission of International Electrotechnical Commission (IEC).60

60The authors thank the International Electrotechnical Commission (IEC) for per-mission to reproduce: weighting curve from its International Standard IEC 61672-1and IEC 60537. All such extracts are copyright of IEC, Geneva, Switzerland. All rightsreserved. Further information on the IEC is available from www.iec.ch. IEC has noresponsibility for the placement and context in which the extracts and contents arereproduced by the author; nor is IEC in any way responsible for the other content oraccuracy therein.