基于TMS320F2812的音频信号分析仪.doc

基于TMS320F2812的音频信号分析仪的硬件设计 学生姓名：陆敏 班级：040421 指导老师：张先庭 摘要：音频信号分析是指通过采集处理技术对音频信号成分进行分析，随着信息处理技术的不断发展，处理分析音频信号的设备也日渐增多。目前，音频信号分析仪在很多领域都有着广泛的应用，包括工业检测、医疗设备、军事、通信、消费电子等诸多领域。 本音频信号分析仪以TI公司的高速数字信号处理器DSP为主控制器，通过AD转换，对音频信号进行采样，把连续信号离散化，然后通过FFT快速傅氏变换运算，在时域和频域对音频信号各个频率分量以及功率等指标进行分析和处理，然后通过TFT480234-6.2高分辨率LCD对信号的频谱进行显示。系统主要由音频信号预处理模块、A/D转换模块、键盘和显示模块组成。其中，音频信号预处理模块是对输入信号进行平滑滤波等处理，A/D转换模块是对信号进行量化采集，键盘和显示模块是对处理完的信号进行显示和人机对话。 该系统能够精确测量的音频信号频率范围为200Hz-10KHz，其幅度范围为100mVpp-5Vpp，分辨力分为20Hz。测量功率精确度高达1%,并且能够准确的测量周期信号的周期，是理想的音频信号分析仪的解决方案。 关键词：音频信号分析仪 TMS320F2812 FFT快速傅氏变换 指导老师签名： Hardware design for Audio Signal Analyzer based on the TMS320F2812 Student name:Lu Min Class:040421 Supervisor:Zhang Xian Ting Abstract: It is the Audio signal analysis that analysis the audio signal components through the acquisition and processing technology ,with the continues development of information processing technology , equipments, which analysis and processing the audio signal are also increasing. At present, the audio signal analyzer have a wide range of applications in many fields,including industrial inspection, medical equipment, military, communications, consumer electronics and other fields. The audio signal analyzer is controlled by DSP，TIs high-speed digital signal processor, through the AD converter, sampling the audio signal, discrete the continuous signal, and then through the FFT fast Fourier transform computing, analysis and processing the audio signal in the time domain and frequency domain and the various frequency components Power and other indicators , and then display the spectrum signals through TFT480234-6.2 high-resolution LCD . The System is mainly composed of the audio signal preprocessing module, A / D converter module, keyboard and display modules. The audio signal preprocessing module,which processing the input signal, such as smoothing filter, A / D converter module is to quantify the signal acquisition, keyboard and display module i