特定频带扬声器频响补偿技术

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。 

Compensation for the frequency response of loudspeaker array at specific frequency band

For the directional sound technology using loudspeaker array, digital filter is often used to compensate frequency response of each loudspeaker unit to get the same frequency response of each channel. Usually, compensation techniques are carried out in a full band, and their performance for each frequency bin are the same. However, for some situations, not all the frequency bins are needed to be compensated. Combined with multi-rate signal processing technique and filter optimal design methods, Frequency response compensation technology for specific frequency band is presented. Result of the experiment using the technique shows that, under the same filter order, the compensation performance of the specific frequency band has been greatly improved.