一种基于FFT的高分辨率音频频率测量方法  

A Method of High-Resolution Audio Frequency Measurement Based on FFT

作　　者：徐健 李晓慧 Xu Jian;Li Xiao-Hui(China Electronics Technology Instruments Co.,Ltd,Shandong Qingdao 266555)

机构地区：[1]中电科仪器仪表有限公司,山东青岛266555

出　　处：《电子质量》2020年第2期11-14,共4页Electronics Quality

摘　　要：传统音频分析算法中存在的栅栏效应和频率泄露现象大大降低了频率、幅度的计算精度,尤其是在快速傅里叶变换中点数较少时,直接计算出的频率误差很大。基于此,该文提出了一种加窗插值快速傅里叶变换改进算法。在该改进算法中采用加窗插值算法来减小频谱泄露,消除栅栏效应引起的误差,改进频率及幅度校正参数的计算方法,大大提高了频谱频率及幅度的计算结果精度。The presence of fence effect and spectrum leakage greatly reduces the calculation accuracy of frequency and amplitude,the error is larger especially when the number of FFT is less.Based on this,this paper presents an improved algorithm base on Hanning-Window and Interpolated FFT.In this improved algorithm,the Hanning-Window and interpolation is used to reduce the spectrum leakage,eliminate the error cause by the fence effect and improve the correction algorithm about the frequency and the amplitude.This improved algorithm greatly improves the calculation accuracy of the frequency and the amplitude.

关 键 词：音频分析 快速傅里叶变换 加窗插值FFT 

分 类 号：TM935.1[电气工程—电力电子与电力传动]