Finite Impulse Response Filters - Introduction to Digital Signal Processing and Filter Design - page 264

1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
− 0.1

H id ( w )

0 0.2 π 0.4 π 0.6 π 0.8 π π

Figure 5.6 Frequency response of a lowpass filter, showing Gibbs overshoot. (Reprinted
from Ref. 9, with permission from John Wiley & Sons, Inc.)

g (n)

( a )

n

− M 0 M

w R (n)

n

( b )

− M 0 M

h w (n)

n

( c )

− M 0 M

( d ) n

0 M 2M

Figure 5.7 Coefficients of the FIR filter modified by a rectangular window function.