An example spectrogram for recorded speech data is shown in Fig.8.10. It was generated using the Matlab code displayed in Fig.8.11. The function spectrogram is listed in §I.5. The spectrogram is computed as a sequence of FFTs of windowed data segments. The spectrogram is plotted by ...
In this section, instead of doing it manually, we do it using fft() provided by Matlab. Here is the code:N=4; x=[2 3 -1 4]; t=0:N-1; subplot(311) stem(t,x); xlabel('Time (s)'); ylabel('Amplitude'); title('Input sequence') subplot(312); stem(0:N-1,abs(fft(x))...
Open in MATLAB Online Hi Lisa, you had a couple problems with your code: ThemeCopy N= 4; x=1:4; for k=0:3 for n = 0:3; y(n+1) = x(n+1).*exp(-(1j*2*pi*k*n)/N); end xdft(k+1)= sum(y); end compare to ThemeCopy fft(x) 3 Comments Show 1 older comment ...
上篇博文:【 MATLAB 】DFT的性质讨论(二)序列的循环移位及其 MATLAB 实现(时域方法) 提到了对序列x(n)做循环移位后的DFT形式为: 上篇博文已经讨论过了第一种实现循环移位的方法,通过在时域中对序列移位,之后取模运算,得到循环移位。并给出了精辟地验证。可以很放心的使用。 这篇博文呢?我们就通过序列循环移位后...
Explore DFT frequency accuracy, got stuck. Learn more about dft, discrete fourier transform, matlab, digital signal processing MATLAB
Open in MATLAB Online clear; iftrue % code endf1=50;%信号的频率 fs=300;%采样频率 t=1/fs;%采样时间 length_N=30;%采样的点数 fori=1:1:length_N input_x(i)=sin(2*pi*f1*(i-1)*t);%采样正弦信号 end fori=1:30 output_x(i)=0;%...
My Matlab version is R2016b. I am trying to make Matlab code for exponential decay fitting with discrete fourier transform. Details are shown in the article below. (I need only DFT part) http://aip.scitation.org/doi/full/10.1063/1.2839918 ...
原因DFT是傅里叶变换在时域和频域上都呈离散的形式,将信号的时域采样...实验目的加深对离散信号的DTFT和DFT的及其相互关系的理解。实验原理 序列x[n]的DTFT定义: N点序列x[n]的DFT定义:在MATLAB中,对形式为的DTDFT可以用函数H DSP学习杂记——DTFT、DFS、DFT对称性总结 ...
Performance Estimation of 2*4 MIMO-MC-CDMA Using Convolution Code in Different Modulation Technique using ZF Detection Scheme In this paper we estimate the performance of 2*4 MIMO-MC-CDMA system using convolution code in MATLAB which highly reduces BER. MC-CDMA (Multi Carrier Code... MAS Kushw...
This section lists the spectrogram function called in the Matlab code displayed in Fig.8.11. function X = spectrogram(x,nfft,fs,window,noverlap,doplot,dbclip); %SPECTROGRAM Calculate spectrogram from signal. % B = SPECTROGRAM(A,NFFT,Fs,WINDOW,NOVERLAP) calculates the % spectrogram for the sig...