基于UCOSIII系统的音频信号分析设计与实现  

Design and Implementation of Audio Signal Analysis Based on UCOSIII System

作　　者：李慧 胡永兵 姚梦茹 LI Hui;HU Yong-bing;YAO Meng-ru(Key Laboratory of Intelligent Computing ＆ Signal Processing of Ministry of Education,Anhui University,Hefei 230601,China)

机构地区：[1]安徽大学计算智能与信号处理教育部重点实验室,安徽合肥230601

出　　处：《计算机技术与发展》2018年第7期130-133,共4页Computer Technology and Development

基　　金：国家自然科学基金(61272317)

摘　　要：传统的音频信号分析设备功能全、精度高,但这些设备不但体积大、结构复杂、反应速度慢、适应范围窄,而且造价非常昂贵,影响了它在小型化系统中的应用。针对这些问题,设计以STM32103单片机为运算核心,采用UCOSIII嵌入式多任务操作系统。放大与滤波电路组成了前级电路。模拟信号经过前级电路后,通过A/D转换,录音到SD卡中,再使用FFT运算电路计算后,同时进行音频播放与频谱显示。硬件设计主要包括前级信号调理模块、STM32音频转换模块、LCD显示模块。在软件设计上,采用UCOSIII嵌入式多任务操作系统,实现多任务运行。通过UCOSIII系统实现对20 k Hz以下音频信号的分析,支持播放与频谱显示同时进行。该设计具有体积小、反应速度快、成本低等优点。The traditional audio signal analysis devices have full functions and high precision,but they are not only with large volume,complicated structure,slowreaction speed and narrowapplication range,also with the expensive cost,which affect its application in the miniaturization of system.For this,with STM32103 micro-controller as the operation core,we adopt UCOSIII embedded multitasking operating system.The front-end circuit is composed of amplifier circuit and filter circuit.The analog signal through the front-end circuit,and the A/D conversion,the tape to the SD card,then the calculation by FFT operation circuit,at the same time playback of audio and display spectrum.The hardware design includes the front-end signal conditioning module,STM32 audio conversion module and LCD display module.In the software design,by using the UCOSIII embedded multitasking operating system,the task is realized to run. The UCOSIII system is adopted to analyze the audio signal under 20 k Hz,supporting playback and spectrum display simultaneously. This design has small volume,fast response speed and lowcost.

关 键 词：音频信号 UCOSIII系统 播放 STM32 频谱 

分 类 号：TN919[电子电信—通信与信息系统]