基于SC声音频谱分析系统设计.docVIP

摘要 频谱分析是将信号表示成不同频率的正弦分量或虚指数分量的叠加，即从频率的角度分析信号，它在声音处理、图像处理、数字音频、地震勘探等方面有着广泛的应用。快速傅立叶(FFT)算法和S3C2410芯片的出现，为频域分析的实时处理提供了有效的解决方案。 本文对基于S3C2410的声音信号频谱分析系统进行了开发，主要工作如下： 首先，对声音信号的时域和频域处理方法进行了分析，根据声音信号短时平稳的特点，详细阐述了其短时分析方法，并探讨了声音信号的基音周期检测方法。 然后，详细介绍了本系统采用的主要硬件设备的功能和特点，包括S3C2410芯片。在此基础上，完成了系统的硬件和软件设计，给出了核心程序实现过程及部分原代码，实现了一种基于S3C2410的声音频谱分析系统。该系统结构简单、使用方便，可利用ARM9强大的数据处理功能对声音信号进行频谱分析。 最后，对此设计方案进行了理论分析和仿真实验，并在S3C2410上就一些相关问题做了实验，取得较为满意的结果，验证了该系统的可行性。 关键词：声音频谱分析；声音处理；快速傅立叶变换；S3C2410 Abstract Signal is regarded as superposition of different frequency sine component or virtual function component in spectrum analysis．Spectrum analysis is applied extensively in the speech processing，image processing，digital audio，seismic exploration etc．．Since fast Fourier transform(FFT)and S3C2410chip appeared，it provides effective solutions for real-time processing of spectrum analysis． This thesis developed spectrum analysis system based on speechS3C2410．Major works areas follows： First，the time—domain processing and frequency-domain processing of speech signal are introduced in this thesis．According to short·term stationary characteristics of speech signal，the thesis exposition short—term analysis method in detail．And also discuss the pitch detection method based on speech signal． Second．the functions and features of main hardware equipments are introduced．This system include S3C2410 .The systems hardware and software design are completed and part of source code about core procedure are provided．We developed the spectrum analysis system of speech signal based on S3C2410．The system has a simple structure and is easy to use．while we use the powerful processing function of S3C2410 to analyze speech signal． Finally，the total scheme of this system is demonstrated in theory and is tested on the S3C2410，and results is satisfactory．Analysis results prove that the system is feasible． Key Words：Spectrum Analysis；Speech Processing；FFT；S3C2410 目录 摘要 1 Abstract 2 引言 5 1 绪论 6 1.1 课题