Optimal and Adaptive Virtual Unidirectional Sound Source in 
                        Active Noise Control

<table>Noise N2
attenuation using analytical VUSS solution. —
Spectrum with ANC, - - -  spectrum
without ANC. </table>

Advances in Acoustics and Vibration

Figure 6: Optimal and Adaptive Virtual Unidirectional Sound Source in 
                        Active Noise Control 