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130
Figure 9-17
Sdao}Anm Viaw Sa}}in6 SoAaan p
Spectrum Bins: It allows you to set the number of frequency bins into which
the spectrum is divided.
Window function: It allows you to select one of the standard window functions
to reduce the impact of running on a time-limited waveform.
Table 9-3
Winpow」nno}ion TeqIa
Window
Main peak
width
(bins @ -
3dB)
Highest
side lobe
(dB)
Side lobe
roll-off
(dB/octave)
Description
Rectangle
0.89
-13.2
6
No fading; maximal
sharpness; used for
short transients
Blackman
1.68
-58
18
Often used for audio
work
Blackman-
Harris
1.90
-92
6
Used for general
purpose
Flattop
2.94
-44
6
Negligible pass-band
ripple; mainly used for
calibration
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