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对于基于扬声器阵列的定向声技术,为了保证每个通道具有相同的频率响应,需要采用数字滤波器对每个扬声器单元进行频响补偿。通常采用的扬声器频响补偿技术都是在全频带进行,其对每个频率点的补偿性能具有相同权重。然而对于一些实际场合,有时只要求每个通道在某个特定频段具有相同频率响应,而对其他频段的频响补偿性能要求并不高。本文针对这一应用场景,结合多速率采样方法和滤波器优化设计方法,提出了特定频带的扬声器频响补偿技术。实验结果表明,采用该技术,在相同滤波器阶数下,大大提高了系统在指定频带的频响补偿性能。
For directional array technology based on loudspeaker arrays, each loudspeaker unit needs to be frequency-compensated with a digital filter in order to ensure the same frequency response for each channel. Commonly used speaker frequency response compensation techniques are carried out in full band, the compensation for each frequency point has the same weight. However, for some practical occasions, it is sometimes required that each channel have the same frequency response in a specific frequency band, while the performance requirements for frequency response compensation in other frequency bands are not high. In view of this application scenario, combined with multi-rate sampling method and filter optimization design method, this paper proposes a specific frequency band speaker frequency response compensation technology. Experimental results show that the proposed method can greatly improve the system’s frequency response compensation performance in the specified frequency band under the same filter order.