Active Suppression of Narrowband Noise by Multiple Secondary Sources

Figure 4

Real-time narrowband control results without the quality factor. ((a), (b), (c)) Spectrograms after control when LS1 only, LS2 only, and LS1 + LS2 are operated, respectively. ((d), (e), (f)) Comparison of error spectra between “before control” and “after control.” ((g), (h), (i)) Comparison of attenuations.

(a)

(b)

(c)

(d)

(e)

(f)

(g)

(h)

(i)