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Study on Virtual Sound Field Reproductive Processing and its Reciprocal Relation in Multimedia Signals.

多媒体信号中虚拟声场再现处理及其相互关系的研究。

基本信息

批准号：
11650414
负责人：
KASUGA Masao
金额：
$ 2.18万
依托单位：
Utsunomiya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

项目摘要

Recent progress in digital signal processing has made it possible to reproduce 3D sound fields based on high fidelity sound signals. It is regarded the method for localizing sound images using FIR filters is one of the most important techniques for virtual sound field reproduction by using binaural signals simulated by head-related transfer functions (HRTFs). However it is very difficult to control the sound field by using the FIR filters because of extreme higher orders of those filters. In this point of view. We propose a simple method using HR filters for realizing sound image localization. In the filtering process. such as the multiplication operation. this method can reduce the cost to possibly 1/15 to 1/30 as compared with the FIR filters. In our some experiments, binaural signals are reproduced via two loudspeakers in both case of using the FIR filter and the HR filters. Some localization experiments are carried out. As the result. the sound localization on the horizontal plane using the HR filters was almost similar to the case of using the FIR filters. It is shown that the approximation technique of HRTFs using the HR filters is effective for the sound localization on the horizontal plane. However, the non-linearity of phase characteristics of the HR filters may cause decrease of the sound localization accuracy. We conclude the largest phase error is at most about 10 degrees difference in phase characteristics through some experiments using band noises.

数字信号处理的最新进展已经使得基于高保真度声音信号再现3D声场成为可能。它被认为是使用头相关传递函数（HRTF）模拟的双耳信号的虚拟声场再现的最重要的技术之一，使用FIR滤波器用于定位声像的方法。然而，由于FIR滤波器的阶数非常高，因此很难通过使用FIR滤波器来控制声场。从这个角度来看。我们提出了一种简单的方法，使用HR滤波器实现声像定位。在过滤过程中。例如乘法运算。与FIR滤波器相比，该方法可以将成本降低到可能的1/15至1/30。在我们的一些实验中，在使用FIR滤波器和HR滤波器的两种情况下，通过两个扬声器再现双耳信号。进行了定位实验。结果呢。使用HR滤波器在水平面上的声音定位几乎类似于使用FIR滤波器的情况。结果表明，使用HR滤波器的HRTF近似技术是有效的水平面上的声音定位。然而，HR滤波器的相位特性的非线性可能导致声音定位精度的降低。通过带噪实验，我们得出最大相位误差最多为10度左右的相位特性差。