Study and Design of Second-Order Differential Arrays - Study and Design of Differential Microphone Arrays - page 78

10
5
0

10
5
0

− 5
− 10
− 15
− 20
− 25
− 30

− 5
− 10
− 15
− 20
− 25
− 30

0 . 5 1 . 0 1 . 5 2 . 0 2 . 5 3 . 0 3 . 5 4 . 0 0 0 0 . 5 1 . 0 1 . 5 2 . 0 2 . 5 3 . 0 3 . 5 4 . 0

F (kHz) F (kHz)

( a) ( b )

10
5
0

10
5
0

− 5
− 10
− 15
− 20
− 25
− 30

− 5
− 10
− 15
− 20
− 25
− 30

0 0 . 5 1 . 0 1 . 5 2 . 0 2 . 5 3 . 0 3 . 5 4 . 0

0 0 . 5 1 . 0 1 . 5 2 . 0 2 . 5 3 . 0 3 . 5 4 . 0

F (kHz) F (kHz)

(c) (d)

FIG. 4.18 The directivity factor of the second-order supercardioid, as a function of fre-
quency, for different values of Δ : (a) Δ = 1 cm, (b) Δ = 2 cm, (c) Δ = 3 cm, and (d)
Δ = 5 cm.