Efficient 3-D Sound Movement with Time-Varying IIR Filters
Efficient 3-D Sound Movement with Time-Varying IIR Filters
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使用时变 IIR 滤波器实现高效 3-D 声音运动
DOI：
10.1093/ietfec/e90-a.3.618
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发表时间：
2007
期刊：
影响因子：
--
通讯作者：
Yukihiro Nakamura
中科院分区：
文献类型：
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作者：
K. Tsujino;W. Kobayashi;T. Onoye;Yukihiro Nakamura
使用头部相关传递函数（HRTF）的3D声音适用于诸如便携式设备的嵌入式系统，因为它可以在没有多通道换能器的情况下创建空间声音效果。利用IIR滤波器对HRTF进行低阶建模，可以有效地减少嵌入式应用中所需的计算量。尽管人们已经认真研究了使用IIR滤波器对HRTF的建模，但很少关注使用IIR滤波器的声音运动，而这对于3D声音的实际应用很重要。本文提出了一种利用时变IIR滤波器和变延迟滤波器实现声音运动的实用方法。与传统的低阶FIR实现相比，该方法的声音运动的计算成本降低了约50%。为了便于有效地实现3-D声音运动，输出声音的主观质量和实现参数，如滤波器系数数据库的大小和滤波器系数的更新周期之间的权衡也进行了讨论。
3-D sound using head-related transfer functions (HRTFs) is applicable to embedded systems such as portable devices, since it can create spatial sound effect without multichannel transducers. Low-order modeling of HRTF with an IIR filter is effective for the reduction of the computational load required in embedded applications. Although modeling of HRTFs with IIR filters has been studied earnestly, little attention has been paid to sound movement with IIR filters, which is important for practical applications of 3-D sound. In this paper, a practical method for sound movement is proposed, which utilizes time-varying IIR filters and variable delay filters. The computational cost for sound movement is reduced by about 50% with the proposed method, compared to conventional low-order FIR implementation. In order to facilitate efficient implementation of 3-D sound movement, tradeoffs between the subjective quality of the output sound and implementation parameters such as the size of filter coefficient database and the update period of filter coefficients are also discussed.