Digital Signal Processing Reference
In-Depth Information
10
10
8
8
6
6
4
4
2
2
0
0
0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
F
(kHz)
F
(kHz)
(a
)
(
b
)
10
10
8
8
6
6
4
4
2
2
0
0
0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
F
(kHz)
F
(kHz)
(c
)
(
d
)
10
10
8
8
6
6
4
4
2
2
0
0
0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
F
(kHz)
F
(kHz)
(e)
(f)
FIG. 6.10
The directivity factor of the second-order cardioid, as a function of frequency,
for different values of
M
: (a)
M
= 3, (b)
M
= 4, (c)
M
= 5, (d)
M
= 6, (e)
M
= 7, and
(f)
M
= 8.
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