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本文我在北航读研时主修《现代偏微分方程》时花费一个多月时间写的期末报告,里面系统阐述了快速傅里叶变换的算法原理及其在数字信号处理等工程技术中的应用。介绍了一维DFT的基2 FFT 算法频域抽取和时域抽取FFT的短发原理和编程步骤。最后在附录中给出了一维DFT的基2 FFT 算法(包括频域抽取的FFT和IFFT算法、时域抽取的FFT和IFFT算法),一维任意非基2 FFT算法,二维DFT的基2 FFT 算法以及二维DFT的任意非基2 FFT 算法的详细的Visual C++程序。-The pape
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语音信号的时域分析,有短时能量,短时平均幅度,短时过零率,清音自相关序列,浊音自相关序列,傅里叶分析。-Speech signal time-domain analysis, short-time energy, short-term average, short-term zero-crossing rate, voiceless autocorrelation sequence, voiced autocorrelation sequence, Fourier analysis.
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语音参数提取:短时过零率、短时能量、短时平均幅度、自相关序列、傅里叶分析-Speech parameters extraction: short-time zero-crossing rate, short-time energy, short-term average autocorrelation sequence, Fourier analysis
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时频分析中的cohen类中最基本的双线性时频分布式wigner-ville分布,由于在该分布中不含窗函数,因此避免了短时窗傅里叶变换时间分辨率、频率分辨率相互牵制的矛盾-Time-frequency analysis of the Cohen class of bilinear time-frequency distribution is the most basic Wigner-Ville distribution, because the function in the distribut
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短时分数阶傅里叶变换的Matlab子函数-short time fractional fourier transform
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For restoration of time-domain signals, an
estimate of the instantaneous magnitude spectrum is combined with the
phase of the noisy signal, and then transformed via an inverse discrete
Fourier transform to the time domain. In terms of comput
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一种自适应时间频率分析工具包,和它的中文手册。 内核程序是写在c++中,GUI是matlab函数。 时间频率分辨率远高于短期的傅里叶变换。-An adaptive time frequency analysis toolkit, and its Chinese manual. The kernel program is written in GUI, c++ is a matlab function. The time frequency resolution is much higher th
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令 ,w(n)为高斯窗函数。试用matlab软件,取不同长度的窗函数,分别求x(n)的离散短时傅里叶变换,并进行信号重构。试讨论窗函数长度对时频分辨率、重构精度的影响。-Order, w (n) is Gaussian window function. Try matlab software, takes a different length of the window function, respectively, find x (n) short-time discrete Fourier
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语音信号处理,包括信号的时域分析,频域分析,傅里叶变换,短时能量分析,倒谱,负倒谱等功能。-Speech signal processing, including signal time domain analysis, frequency domain analysis, Fourier transform, short-term energy analysis, cepstrum, negative cepstrum and other functions.
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常见的时频分析技术短时傅里叶变换实现举例,以及一些使用示例(Common time - frequency analysis techniques short - term Fourier transform implementation examples, as well as some use examples)
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以長方形為遮罩的短時頻傅立葉轉換,英文稱為rectangular short time fourier transform(A short time fourier transform with a rectangular mask function. aka recSTFT)
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短时分数阶傅里叶变换,用于多分量线性调频信号的识别过程(Short Time Fractional Fourier Transform)
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短时傅里叶变换的MATLAB实现代码,有效完成时频分析(matlab implementation code of short-time Fourier transform to effectively complete time-frequency analysis)
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对信号进行短时傅里叶变换和小波变换,观察其时频特性,压缩包中含有需要用到的测试信号文件,可以直接运行,供参考(Carry out short-time Fourier transform and wavelet transform on the signal, observe its time-frequency characteristics, and the compression package contains the test signal files needed, which ca
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matlab实现短时傅里叶变换的程序源码,自带例子,十分简单易懂,可以做时频谱分析。(Matlab short-time Fourier transform program source code, with examples, very simple to understand, can do time-frequency spectrum analysis.)
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短时傅里叶变换,short-time fourier transformation,有时也叫加窗傅里叶变换,时间窗口使得信号只在某一小区间内有效,这就避免了传统的傅里叶变换在时频局部表达能力上的不足,使得傅里叶变换有了局部定位的能力。
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