Digital Signal Processing Reference
In-Depth Information
Fig. 4.6 Coupled-form real-
ization of a second-order IIR
filter
x
(
n
)
y
(
n
)
+
+
r
sin(
q
)
r
cos(
q
)
z
-
1
z
-
1
r
cos(
)
q
+
+
-
r
sin(
q
)
Fig. 4.7 Possible locations
of all stable pole pairs,
assuming 5-bit quantization:
coupled-form realization
1
0.8
0.6
0.4
0.2
0
−0.2
−0.4
−0.6
−0.8
−1
−1
−0.5
0
0.5
1
Real z
Fig. 4.8 Possible locations
of all stable pole pairs,
assuming 5-bit quantization:
direct form realization
1
0.8
0.6
0.4
0.2
0
−0.2
−0.4
−0.6
−0.8
−1
−1
−0.5
0
0.5
1
Real z
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