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DIGITAL SIGNAL PROCESSING (DSP) 213
zeroed out of the window. The window chart has a characteristic triangular shape
(see Figure 8-15). The math behind the Bartlett function is explained at http://
mathworld.wolfram.com/BartlettFunction.html.
Hanning window This window is used to implement the Raised Cosine filter
that we’ll discuss later (see Figure 8-16). The math behind the Hanning window
is shown at http://mathworld.wolfram.com/HanningFunction.html.

0.0 0.1 0.2 0.3 0.4 0.5
0 db
-20 db
-40 db
-60 db
-80 db
-100 db
-120 db

FIGURE 8-15 Triangular DSP window and frequency response

0.0 0.1 0.2 0.3 0.4 0.5
0 db
-20 db
-40 db
-60 db
-80 db
-100 db
-120 db

FIGURE 8-16 Hanning DSP window and frequency response