文档介绍：第三届OpenHW开源硬件与嵌入式大赛
基于虚拟环绕声的音频
处理器
设计方案
中南民族大学
2012年3月
摘要
虚拟听觉空间(VAS)是一门新兴的边缘交叉学科,涉及听觉心理学、听觉生理学、多传感器集成与融合、人工智能、并行计算和高性能计算机系统等多个研究领域。VAS有时也称为虚拟听觉显示(Virtual Auditory Display)、三维声再现系统(3D Sound Rendering/Reproducing System)、虚拟声再现系统(Virtual Sound Rendering/Reproducing System)、空间声音再现系统(Spatial Sound Rendering System)、虚拟空间/三维听觉系统(Virtual Spatial/(3D)Auditory Systems)、声音空间化系统(Sound Spatialization System )和双耳技术(Binaural Technology)等,是通过对双耳的声音信号进行捡拾、模拟和重放,让倾听者在虚拟环境中听到的声信号逼近在真实环境声场中听到的声信号,因而在电影院、家庭影院中得到了很好的应用[15]。其中多通路环绕声经过许多年的发展,也获得了很好的效果,、、,(ITU)所推荐[2]。
此外,为了适应音频的播放,特构建了一款音频DSP处理器以适应本系统。
虚拟环绕声技术是区别于多通道环绕声技术的另一类声重放系统,它利用声源到双耳的传递函数(HRTF)通过双耳(即空间两点)声信号的传输与重放,实现声音空间信息的传输与重放,这种系统只需两路独立的传输信号和重放扬声器(或耳机) ,因而在一些不便于安装多通道放声系统的环境下,对改善电视机、手机、MP3/MP4等等电子产品的音频声效有很大的帮助。
关键字:相关传递函数虚拟环绕声
ABSTRACT
Virtual hearing is a new space on the edge of the cross subject, involving hearing psychology, hearing multi-sensor integration and fusion, artificial intelligence, puting and high puter systems, and other research field. Virtual hearing space sometimes called virtual hearing display, 3 D sound representation system, virtual sound representation systems, space sound representation systems, virtual space 3D auditory system, voice of space systems and ears technology, is through the ears voice signal collecting, simulation and replay, let the listener in the virtual environment heard the acoustic signal of the approaching in the real environment field hear acoustic signal, so in the cinema, home theater has found applications. More than one channel surround sound after many years of development, and also have the very good, also has appeared , , or channel surround system, and channel surround system also for the international munications union (ITU) mendation.
In addition, in order to adapt to the audio playback, especially the construction a audio DSP processors to adapt to the system.
Virtual surround sound