Digital Signal Processing Reference
In-Depth Information
80
80
60
60
40
40
20
20
0
0
0
◦
60
◦
120
◦
180
◦
240
◦
300
◦
360
◦
Θ
N
0
◦
60
◦
120
◦
180
◦
240
◦
300
◦
360
◦
Θ
N
(
a
)
(
b
)
80
80
60
60
40
40
20
20
0
0
0
◦
60
◦
120
◦
180
◦
240
◦
300
◦
360
◦
Θ
N
0
◦
60
◦
120
◦
180
◦
240
◦
300
◦
360
◦
Θ
N
(
c
)
(
d
)
80
80
60
60
40
40
20
20
0
0
0
◦
60
◦
120
◦
180
◦
240
◦
300
◦
360
◦
Θ
N
0
◦
60
◦
120
◦
180
◦
240
◦
300
◦
360
◦
Θ
N
(e)
(f)
FIG. 4.23
The gain of the second-order quadrupole for a point noise source, as a function of
Θ
N
, for several frequencies and two values of
Δ
: (a)
F
=0
.
5 kHz,
Δ
= 1 cm, (b)
F
=0
.
5 kHz,
Δ
= 2 cm, (c)
F
= 1 kHz,
Δ
= 1 cm, (d)
F
= 1 kHz,
Δ
= 2 cm, (e)
F
= 3 kHz,
Δ
= 1 cm,
and (f)
F
= 3 kHz,
Δ
= 2 cm.
4.4 Design of Another Well-Known Second-Order
Cardioid
There exists another very well-known second-order cardioid that we have not
discussed so far. Its directional pattern is [1], [2]
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