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中文核心期刊

基于参量阵的多扬声器系统双耳虚拟声重放实验研究

An experimental investigation of binaural sound reproduction using a hybrid system based on parametric loudspeaker array

  • 摘要: 传统双耳声重放系统通常采用串声消除滤波器对信号进行处理后, 使用普通电动扬声器进行重放, 但该方法在高频段的稳定性较差。参量阵扬声器具有高指向性且在中高频具有较好的响应, 可实现自然抑制串声干扰, 但其低频响应较差。因此, 提出了基于参量阵扬声器的多扬声器混合系统, 用于双耳虚拟声重放。该系统在1 kHz以下使用电动扬声器进行串声消除, 在1 kHz以上使用参量阵扬声器直接与头部相关传输函数乘积进行虚拟声重放, 从而实现宽频带范围内的串声抑制和精准的虚拟声定位。同时, 为改善多扬声器系统的音质表现, 在虚拟声重放前对该混合系统采用了相位和幅度均衡使频率响应平坦。为验证系统性能, 设计并实施了两个心理声学实验, 分别对该混合系统和传统双电动扬声器系统在声像定位和主观音质感知方面进行对比评估。实验结果表明, 与双通道电动扬声器系统相比, 混合系统显著减少了侧方定位误差、提升了声像稳定性, 并在主观音质评价上较好。

     

    Abstract: Traditional virtual sound reproduction systems often employ crosstalk cancellation filters to mitigate crosstalk paths, and then use conventional electro-dynamic loudspeaker (EDL) to reproduce the signal. However, crosstalk cancellation filters are deteriorated in the high-frequency range. In contrast, parametric array loudspeaker (PAL) has a high directivity and excellent performance in the mid-to-high frequency range, with effective natural channel separations. However, the PAL suffers from poor low-frequency response. This study presents a multi-loudspeaker (Hybrid) system that combines the PAL and EDL to achieve wideband virtual binaural sound reproduction. The proposed system uses the EDL to process signals below 1 kHz with the crosstalk cancellation method and employs the PAL to directly convolve with head-related transfer function (HRTF) for virtual sound reproduction above 1 kHz. It can achieve effective crosstalk cancellation and accurate virtual sound localization across a wide frequency range. Additionally, phase and magnitude equalization techniques are applied to achieve a flat frequency response of the Hybrid system. Two psychoacoustic experiments are conducted to compare the system’s localization accuracy and timbre perception with a conventional two-channel EDL. Experimental results demonstrate the Hybrid system reduces lateral localization errors and provides better subjective timbre perception. These findings provide robust experimental support for using the PAL-based hybrid systems in stereo sound reproduction, providing an effective solution for virtual acoustic environments.

     

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