语谱分析的FPGA实现  

Realization of Spectrogram Analysis with FPGA

作　　者：孙红英[1] 杨鸿武[1] 陶中幸[1] 

机构地区：[1]西北师范大学物理与电子工程学院,兰州730070

出　　处：《电子与信息学报》2011年第5期1238-1242,共5页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(60875015);教育部科学研究重点项目(208146)资助课题

摘　　要：语谱是语音信号短时时频分析结果的图形显示,能够清楚地揭示语音信号的时变频谱特性,反映语音信号的动态频谱特性和时域变化特性,在语音信号的分析以及语音学的研究中具有重要的价值。该文利用短时傅里叶变换(Short Time Fourier Transform,STFT)方法对语音信号进行分析,采用了一种按时域抽取基-4 FFT算法实现流水线结构的蝶形运算单元,在FPGA上实现了语音信号的语谱分析,并利用非线性映射算法实现了语谱的VGA显示。Spectrogram is a kind of graphic representation of time-frequency analysis of speech signals.Because spectrogram can be adopted to demonstrate the dynamic characteristics of time varying speech signals both in frequency domain and time domain,it has been widely employed in speech analysis and phonetic researches.This paper realizes a spectrogram on Field Programmable Gate Array（FPGA） with Short Time Fourier Transform（STFT） method by using a line structure butterfly process unit which adopted Radix4 decimation in time FFT algorithm.The spectrogram is also displayed on VGA displayer by adopting a non-linear mapping algorithm.

关 键 词：语谱 时频分析 短时傅里叶变换(STFT) 蝶形运算单元 FPGA 

分 类 号：TN912.3[电子电信—通信与信息系统]