The unidirectional acoustic boundary has broad application prospects. Besides the strongly nonlinear acoustic medium, which can be applied in the realization of the unidirectional acoustic boundary, the present paper proposes a new approach through the active control method, where the secondary source has the property of single directivity. In order to validate its effectiveness in one-dimensional duct, experiments are implemented in three steps: 1. construct the secondary source with the single directivity by two loudspeakers; 2. design the steady unidirectional acoustic boundary by the secondary source in step 1; 3. implement the adaptive unidirectional acoustic boundary by the secondary source in step 1, and through FXLMS algorithm. Results show that the presented approach is feasible and effective for one-dimensional unidirectional acoustic boundary, and the system only contains two traditional loudspeakers and two traditional microphones; thus it will be more feasible for practical realizations of the unidirectional acoustic boundary, compared with the acoustic diode. (C) 2015 Institute of Noise Control Engineering.
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