Digital Signal Processing Reference
In-Depth Information
90
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90
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0
dB
−10
dB
−20
dB
−30
dB
−40
dB
0
dB
−10
dB
−20
dB
−30
dB
−40
dB
120
◦
60
◦
120
◦
60
◦
150
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30
◦
150
◦
30
◦
180
◦
0
◦
180
◦
0
◦
210
◦
330
◦
210
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330
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240
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300
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240
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300
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270
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270
◦
(a)
(b)
90
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90
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0
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−10
dB
−20
dB
−30
dB
−40
dB
0
dB
−10
dB
−20
dB
−30
dB
−40
dB
120
◦
60
◦
120
◦
60
◦
150
◦
30
◦
150
◦
30
◦
180
◦
180
◦
0
◦
0
◦
210
◦
330
◦
210
◦
330
◦
240
◦
300
◦
240
◦
300
◦
270
◦
270
◦
(c)
(d)
90
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90
◦
0
dB
−10
dB
−20
dB
−30
dB
−40
dB
0
dB
−10
dB
−20
dB
−30
dB
−40
dB
120
◦
60
◦
120
◦
60
◦
150
◦
30
◦
150
◦
30
◦
180
◦
0
◦
180
◦
0
◦
210
◦
330
◦
210
◦
330
◦
240
◦
300
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240
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300
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270
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270
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(e)
(f)
FIG. 4.26
Patterns of the second-order cardioid with one distinct null for several frequen-
cies 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.
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