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A system known as active headrest, generating the so-called zones of quiet at the ears of a person sitting in a chair is considered. It is shown that zones of highest noise reduction generated by a classical double input - double output control system do not reach the ears. To extend the zones four secondary sources, one located over another for each channel, are applied. The error microphones, one...
A system known as the active headrest, generating the so-called zones of quiet at the ears of a person sitting in a chair is considered. Two adaptive control algorithms using the idea of virtual microphones are designed. One of them guaranteeing very high attenuation, is advised if the noise is stationary. Another control system proposed has much more general character and can be successfully applied...
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