基于嵌入式Linux的数字音频延时系统设计  

Design of digital audio delay based on embedded Linux

作　　者：冯义[1] 王击[1] 

机构地区：[1]中南大学信息科学与工程学院,湖南长沙410083

出　　处：《计算机工程与设计》2010年第15期3393-3395,3412,共4页Computer Engineering and Design

摘　　要：针对传统音频延时系统实现方案的不足,提出了基于EP9302(ARM920T)处理器和嵌入式Linux操作系统的数字音频延时系统的实现方案。分析了系统硬件结构,着重介绍了数据存储模块和基于IIS音频总线标准的音频信号预处理模块的具体实现。介绍了以Linux操作系统为核心的多层软件构架,详细分析了音频设备驱动程序的实现机制。测试结果表明,该设计方案具有较高的延时精度,系统在稳定性、可扩展性和可移植性方面表现出色。To improve the defects of the current methods,a digital audio delay system based on EP9302（ARM920T） and embedded Linux is proposed.The design of the hardware is introduced,including the memory control module and the audio data pretreatment module which is based on IIS serial bus interface standard.The software architecture based on embedded Linux operating system is illustrated,and the mechanism of audio device driver is fully discussed.Test results show that this design with high delay precision also have good performances in system stability,scalability,and portability.

关 键 词：ARM处理器 嵌入式LINUX IIS总线 音频设备 ALSA音频驱动 

分 类 号：TP302.1[自动化与计算机技术—计算机系统结构]