dsp的音频信号分析仪.docVIP

基于DSP的音频信号分析仪 摘 要 音频信号分析被广泛用于测量各类音频信号的时域特性、频域特性及其失真特性等，在生产实践和科学研究中有着广泛的应用，而进行比较完整的音频测试分析需要购置各种价格昂贵的专用仪器。随着快速傅里叶变换（FFT）DSP芯片的出现和发展，它们为各式各样的频率问题提供了一个统一的、经济的、单片集成的解决方法，将DSPSTC89C51，频谱分析 DSP-based audio signal analyzer ABSTRACT Audio signal is widely used to measure all kinds of audio signal character of time domain, the frequency domain properties and its characters of distortion. It is widely used in the production practice and scientific research. But undertake complete audio test analysis needed to purchase all kinds of expensive special apparatus. Along with the fast Fourier transform (FFT) algorithm and digital signal processor (DSP) to emerge and development, they for all kinds of frequency provides a unified, economic, monolithic integrated solutions, DSP technology is applied to the audio analysis of the design and manufacture, is given to the design of the audio analyzer has brought a new look. This paper first analysis the audio signal processing methods of time domain, com- pared with audio signal spectrum research and other design schemes, put forward the conception that based on DSP audio signal analyzer. After the introduction of the audio signal analyzer based on DSP involved all sorts of relevant principle, puts forward the basic idea is: by DSP TMS320C5402 for data processor, STC89C51 to lead and control DSP chip, and at the front end audio signal through enlargement filter and 16 sound card sampling, DSP chip for audio signal 1024 points of real-time FFT transform, for audio signal the main frequency components for real-time analysis, the results through the HPI bus to STC89C51 processing, through a serial port to the computer, in the computer on display. Make a more satisfactory effect, verify the feasibility of this system. KEY WORDS: Audio Signal Analyzer，Digital Signal Processing，Fast Fourier Transform，Spectrum，Frequency Analysis 前　言 1 第1章 音频信号分析的基础理论分析 3 1.1 音频信号分析原理概述 3 1.2 音频信号分析方法 4 1.2.1 音频信号分析方法概述 5 1.2.2 音频信号分析的内容和分类 5 第2章 基于