Fast Fourier Transforms
Reference
3Ć54
Rectangular Window
0 dB
-20
-40
-50
Hanning Window
0 dB
-20
-40
-60
-80
Hamming Window
0 dB
-20
-40
-60
Blackman-Harris
Window
0 dB
-20
-40
-60
-80
-100
-101
FFT Window Type Bandpass Filter
0.89
-3 dB Bandwidth Highest Side Lobe
1.28
1.28
1.28
-13 dB
–32 dB
–43 dB
–94 dB
Figure 3-28: FFT Windows and Bandpass Characteristics
Care should be taken when using bell shaped widows to be sure that the
most interesting parts of the signal in the time domain record are positioned in
the center region of the window so that the tapering does not cause severe
errors.
See
Waveform Differentiation
, on page 3-150.
See
Waveform Integration
, on page 3-154.
See
Waveform Math
, on page 3-159.
For More
Information
To Next Page
Loading...
