In this paper, a kind of active noise barrier ( ANB )using active noise contro1 ( ANC )technique to implove noise insulation performance in low 仕equencies is proposed , The ANB consists of an ordinary noisc barrier , three active noise control units ( ANCU ) and a DSP ( TMS 320C6713 DSK ) . Feedback ANC system is used in the ANCUs 」 n order to achieve higher noise attenu 飢 ion , fast transversal filter ( FrF ) adaptive algorithm is inIroduced into the feedback ANC system , Then, numerical and experimental study on an active noise ba π ier is conducted . As a result , the active noise balrier shows better noise insulation performance in low frequencies . Moreover , in this paper, basic concept of a new type hybrid ANC system which is a combination of the feedforward and feedback control structures is proposed . The feedback controller provides active noise insulation , and 血 e feedfbrward controller whose reference signal is synthesized in the feedback controller cancels noise at a specific position where its error 血 crophone is . Effectiveness of the hybrid ANC system is verified byexperiment . The result shows Ihat the hybrid ANC system can reduce noise better than single feedforward or feedback ANC systems .
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