Digital Signal Processing Reference
In-Depth Information
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(a)
(b)
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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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