IEC Acoustic Standard IEC 61400-11
IEC Acoustic Standard IEC 61400-11
IEC Acoustic Standard IEC 61400-11
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Determine Critical Bandwidth<br />
Calculate the critical bandwidth<br />
Critical<br />
Bandwidth<br />
For this possible tone at 249 Hz (f c = 249), the critical<br />
bandwidth is 104.43 Hz<br />
Center critical bandwidth around the peak. For this<br />
example 196.8 to 301.2 Hz.<br />
This will not symmetrically fit due to the resolution. How<br />
to specifically deal with this is not covered in the<br />
standard.<br />
For our purposes, the critical bandwidth is 102 Hz<br />
covering the lines from 198 to 300 Hz<br />
NATIONAL RENEWABLE ENERGY LABORATORY<br />
�<br />
� � f �<br />
c<br />
� 25 � 75�1�<br />
1,<br />
4�<br />
�<br />
� �1000�<br />
� � �<br />
2<br />
�<br />
�<br />
�<br />
�<br />
�<br />
0,<br />
69<br />
Freq (Hz) spl (dB A)<br />
198 25.30<br />
201 25.50<br />
204 26.02<br />
207 29.15<br />
210 32.15<br />
213 37.62<br />
216 39.88<br />
219 39.75<br />
222 39.86<br />
225 41.20<br />
228 40.31<br />
231 42.48<br />
234 43.87<br />
237 42.31<br />
240 43.43<br />
243 43.21<br />
246 43.50<br />
249 45.44<br />
252 41.22<br />
255 35.09<br />
258 30.45<br />
261 29.38<br />
264 30.78<br />
267 27.78<br />
270 26.37<br />
273 26.79<br />
276 27.61<br />
279 28.68<br />
282 27.74<br />
285 27.67<br />
288 27.38<br />
291 27.10<br />
294 27.68<br />
297 27.91<br />
300 27.46
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