IEC Acoustic Standard IEC 61400-11

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Determination of Tonality The difference between the masking level and tone level is the tonality ∆L tn For the one critical band analyzed NATIONAL RENEWABLE ENERGY LABORATORY �L � L �L tn pn ∆L tn = 51.88 - 36.58 = 15.30 pt
Determination of Tonality The difference between the masking level and tone level is the tonality ∆L tn For the one critical band analyzed ∆L tn = 15.30 There will be 12 spectra to analyze the same peak and get a ∆L tn value for each spectrum For spectra where there are no tones use the following value The 12 resulting ∆L tn are energy averaged to one ∆L k NATIONAL RENEWABLE ENERGY LABORATORY �L � L �L tn pt � critical bandwidth � �L tn � �10 * log10 � � �effective noisebandwidth � pn
Page 1 and 2: Part I Acoustic Testing Stepping Th
Page 3 and 4: 1 Scope General description and pur
Page 5 and 6: 3 Definitions and 4 Symbols and Uni
Page 7 and 8: 6 Instrumentation Required acoustic
Page 9 and 10: 6 Instrumentation Acoustical calibr
Page 11 and 12: 6 Instrumentation Traceable Calibra
Page 13 and 14: 7 Measurements and Measurement Posi
Page 19 and 20: 8 Data Reduction Procedures Wind sp
Page 21 and 22: 8 Data Reduction Procedures Apparen
Page 23 and 24: Look at NoiseLab Setup Calibration
Page 25 and 26: Filtering for Valid Data - Listen f
Page 27 and 28: Binning and Averaging After binning
Page 29 and 30: Background Correction Calculate the
Page 31 and 32: NATIONAL RENEWABLE ENERGY LABORATOR
Page 33 and 34: One-Third Octave Levels Sound press
Page 35 and 36: Tonality To begin - Two minutes of
Page 37 and 38: Determine Critical Bandwidth Calcul
Page 39 and 40: Classify ‘Masking’ A line is cl
Page 41 and 42: Determination of Tone Level The sou
Page 43: Determination of Masking Level Calc
Page 47: Tonality can be complicated and the

IEC Acoustic Standard IEC 61400-11

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