Abstract
When active noise control (ANC) is applied to acquire a ‘quiet zone’, it may produce an increase in the sound power outside the quiet zone and a change in the primary sound field, which are undesirable in anti-detection and personal audio. To obtain a large noise reduction in the control zone and a small increase of sound power outside the control zone, three wideband ANC algorithms are proposed based on the acoustic contrast control (ACC), least-squares (LS), and least-squares with acoustic contrast control (SFR-ACC) algorithms. With a loudspeaker array as the secondary source, dual-zone ANC with directivity, which realizes noise reduction in one zone without changing the sound power in the other zone, is achieved. Compared with the traditional LS algorithm, the three algorithms proposed in this paper can not only realize that the sound power outside the control zone is increased by less than 1 dB, but also reduce the noise in the control zone by more than 10 dB, which provides a new solution to multi-zone ANC research.
Highlights
Active noise control (ANC) is widely used as it reduces noise at low frequencies
The cost function of the acoustic contrast control (ACC) algorithm does not contribute to noise reduction when it is applied to dual-zone active noise control (ANC) unless it is equalized [14,15]
To realize noise reduction in one zone without changing the sound pressure in the other zone, three wideband ANC algorithms, based on the ACC, constrained least-squares (CLS), and SFR-ACC concepts are proposed in this paper
Summary
Active noise control (ANC) is widely used as it reduces noise at low frequencies. Global ANC can achieve a larger-space noise reduction in the control zone [1,2,3], while local ANC can realize multi-zone noise reduction [4,5,6]. 2 of 7This new control algorithm has good reduction performance in the target areas and less amplification outside the target zone. The leastconstrained points, in order to control the scattered field of a rigid sphere This new control squares approach with acoustic contrast controlsound constraint (SFR-ACC). To verify the feasibility of the SFR-ACC algorithm in ANC the andspatial to realize multi-zone directional acoustic contrast has been used in personal audio system. ANC and to realize directional dual-zone the ANC by reducing noise inalgorithm one zone, in without changing the multi-zone sound power in the other. The three algorithms form directional outputs and realize function that reduces time and resource consumption and makes implementation easier. ANC, the three algorithms proposed in this paper, notand a brief overview the dual-zone.
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