Study and Design of Third-Order Differential Arrays with Three Distinct Nulls - Study and Design of Differential Microphone Arrays - page 105

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. 5.11 The gain of Case 1 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.