IEC Acoustic Standard IEC 61400-11
IEC Acoustic Standard IEC 61400-11
IEC Acoustic Standard IEC 61400-11
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
Determination of Tonality<br />
The difference between the masking level and tone level is the tonality ∆L tn<br />
For the one critical band analyzed<br />
∆L tn = 15.30<br />
There will be 12 spectra to analyze the same peak and get a ∆L tn value for<br />
each spectrum<br />
For spectra where there are no tones use the following value<br />
The 12 resulting ∆L tn are energy averaged to one ∆L k<br />
NATIONAL RENEWABLE ENERGY LABORATORY<br />
�L<br />
� L �L<br />
tn<br />
pt<br />
� critical bandwidth �<br />
�L<br />
tn<br />
� �10<br />
* log10<br />
�<br />
�<br />
�effective<br />
noisebandwidth<br />
�<br />
pn
Change language