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Using the FFT
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The Short-Time Fourier Transform
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Windowing
Window Types
The most commonly used windows include the Rectangular, Triangular, Hanning, Hamming, and Blackman types.
Important differentiating aspects of these windows are the main lobe width and sidelobe magnitudes of their spectra.
The Rectangular window and its associated spectrum (interpolated) are shown in Fig.
5
.
Figure 5:
The Rectangular window and its associated spectrum.
The Triangular window and its associated spectrum (interpolated) are shown in Fig.
6
.
Figure 6:
The Triangular window and its associated spectrum.
The Triangle window can be computed as:
(
12
)
The Hanning window and its associated spectrum (interpolated) are shown in Fig.
7
.
Figure 7:
The Hanning window and its associated spectrum.
The Hanning window can be computed as:
(
13
)
The Hamming window and its associated spectrum (interpolated) are shown in Fig.
8
.
Figure 8:
The Hamming window and its associated spectrum.
The Hamming window can be computed as:
(
14
)
The Blackman window and its associated spectrum (interpolated) are shown in Fig.
9
.
Figure 9:
The Blackman window and its associated spectrum.
The Blackman window can be computed as:
(
15
)
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Gary P. Scavone
.