3M SE Manuel D’Utilisation
3 Frequency resolution
Third -octave bands
Models SE and DL
Third -octave bands
Each octave band can be divided into three adjacent bands called third-
octave band. Because of the logarithmic relationship between adjacent
bands, the center frequencies of third-octave bands differ from each other by
26%. For example, the center frequency of the next third-octave band above
the 1000 Hz third-octave band is at 1260 Hz. Figure 1-3 is similar to Figure 1-
2 but shows the thirty-three third-octave bands in relation to the instrument’s
bandwidth.
octave band. Because of the logarithmic relationship between adjacent
bands, the center frequencies of third-octave bands differ from each other by
26%. For example, the center frequency of the next third-octave band above
the 1000 Hz third-octave band is at 1260 Hz. Figure 1-3 is similar to Figure 1-
2 but shows the thirty-three third-octave bands in relation to the instrument’s
bandwidth.
Figure 1-3: Third Octave bands
Naming bands
Bands are conventionally named for their center frequencies in accordance
with acoustical industry standards. Table 1-1 identifies the SoundPro SE or
DL models that have octave and third-octave bands option with their exact
center frequencies and their corresponding standardized names.
with acoustical industry standards. Table 1-1 identifies the SoundPro SE or
DL models that have octave and third-octave bands option with their exact
center frequencies and their corresponding standardized names.
L
evel