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Search Results for "fft"
Re: FFT pad or no pad
umas...@gmail.com - Jan 25 2011
I have 300sec data collected at 1Hz. I want to look at power spectrum of this time series, so first I need to do FFT(). But I am not sure if I need to pad it with zeros to make i... 
FFT source code [6 Articles]
Miguel Baz - Jul 30 2006
Hi!!
I'm new in this. I've just wanted to know if somebody have the source code of the fft library that uses matlab. Or if somebody knows how does matlab do the fft algorithm. T... FFT pad or no pad [2 Articles]
kctu...@gmail.com - Aug 21 2009
I have 300sec data collected at 1Hz. I want to look at power spectrum of this time series, so first I need to do FFT(). But I am not sure if I need to pad it with zeros to make it ... FFT help needed [2 Articles]
tanoli_hacker - Mar 30 2007
AOA
I am stuck with a problem sir n need your immediate help. I get an
EEG signal from net and try to process it.
Q. What is the result of taking FFT of a signal?
Q. What... Pruning FFT
esth...@yahoo.com - Jun 8 2005
Dear all,
I am looking for some Matlab code on pruning FFT or zoom FFT.
Thank you,
Esther
... fft problems
bh10...@binghamton.edu - Sep 20 2005
Not sure I really understand your problem, but here's some code to help you out:
N=1024; %length of zero padded fft
x=0:100;
f=sin(2*x) + sin(3*x) + sin(4*x);
F=fftsh... fft and matlab functions
mohs...@yahoo.com - Aug 30 2007
hi friends
my question is why we should normalize fft to length of vector not to number of fft point (for plotting frequency response)
the latter is what's the difference between... Convolution Problem [2 Articles]
Fergyanto E Gunawan - Sep 18 2001
Dear All,
As we know that we can solve the convolution integration by FFT as follow
y(t) = x(t) * h(t) = ifft(fft(x).*fft(h)) (1)
That multiplication jus... FFT Magnitude doubt [4 Articles]
Sonia Ramwaswamy - May 27 2003
Hi everybody
I wrote a simple code in MATLAB to find the FFT of signal
**********************************************************
clear all;
clc;
Fs=100... FFT blackbox in simulink
maya...@yahoo.com - Jun 2 2005
hey guyz....
can anyone provide me with the internal structure of the fft block in the xilinx blockset....i have to design a new xilinx library and it would be helpful to k... FFT vs freqz [2 Articles]
divya_8910 - Aug 27 2004
hi,
i have a low pass filter and i plotted the frequency response using
freqz and fft and got diff plots...
b=remez(102,[0 0.5 0.6 1],[1 1 0 0]);
B = f... to remove periodical component from time series
baha...@hotmail.com - Jun 3 2008
hi all,
my question is about time series and fft. I want to remove periodical component from my time series by using fft analysis. I know that I find magnitude and phase values... Help on IFFT
bell...@ion.chem.utk.edu - Sep 15 2007
Hi, All
I have original mass spectrom which is time domain signal. Then I use fft
in Matlab to fourier transform into powerspectrum. Code as below:
a=textread(C:\notebook\0701... FFT Phase
matlaborioso - May 11 2004
Hi, is there any function to change the phase of the algorithm of the
fft in matlab? How could I do this? I am working with binary images
and I need to calculate ff... fft problem [5 Articles]
maria_mount - Jan 20 2004
Hi,
i generate 2 signals in matlab and when i see there spectrum ,the
closely space signals mixed up here what i have done
Fs = 400 ; % sampling rate
Nres = ... calculating Instantaneous frequency (IF) using fft [2 Articles]
marko_jnk - Mar 2 2008
Hi, i have a big problem, i need to calculate Instantaneous frequency
(IF) using fft (Fast Fourier Transform) and STFT (Short Time Fourier
Transform). I have a discrete sinusoi... fft amplitude and frequency
g_arambatzis - Sep 19 2005
Hi,
I am new in this group. I am trying to apply fft on my data but it
seems there is something that I don't understand. I searched previus
posts but nothing helped me. ... FFT Magnitude doubt
Sonia Ramwaswamy - May 27 2003
Hi
Sorry there was some problem with previous mail. Its not == but = only. I dont
know hot it got changed. Any how find below the new piece of code.
*******... need to regenerate the original signal.
moti...@yahoo.com - Aug 9 2009
Hi, all I am motin. I am new in matlab. I fft a signal. and when i fft i take just half part of the fft value because replica is ignored and take the absolute value. now i simple c... spectrum and fft [5 Articles]
Sergio Dominguez - Feb 15 2003
Hi all!
Has anybody found anything strange working with the spectrum and fft functions
implemented in matlab??
The frecuency behaviour is OK, but there is s... About Frequency and FFT ?
aloha - Feb 20 2001
Hi!
I can get the correct frequency value from below code:
Fs = 100;
n = 1/Fs:1/Fs:2;
x = 0.8*sin(2*pi*10*n);
z = fft(x);
N = length(z);
z = abs(z(1... ploting frequncy information of a sin wave [2 Articles]
joshy jose - Jan 23 2007
hai friends,
i was just trying to use inbuilt function fft(x,n) to find out the
frequency information of a sin wave and tried to plot it
i took
n=0:.003:2
x=a*sin(2*pi*5... OFDM simulation (without using FFT)
Oluyemi Omomukuyo - Jun 17 2008
Good day everyone. I am currently doing my thesis on OFDM and my
supervisor wants me to simulate continuous-time OFDM (i.e without
using FFT). I've been able to simulate it using... Generating FFT coefficients
rnjt9 - Apr 22 2003
hello,
i need to generate a generic program in matlab that gives me the
numeric values of the real and imaginary parts of the twiddle factors
used in FFT. I am de... FFT GUIDE
arkkimede - Oct 5 2005
Hi !
Looking in the newsgroup about FFT, I think that a useful starting point could be a Guide
about fft present in the Matworks site:
http://www.mathworks.com/matlabcentr... fft and frequency filtering
ferhatdegirmenci - Jun 8 2005
I have a wav format audio file.
I need to operate with fft and I have to filter it between 30hz to 100hz.
I can read it, but I dont know how to filter it. I don't know... matlab FFT and time shift
- May 4 2001
Hi everybody!
if anybody can answer to that (would be really helpful..):
how to time shift (ts) a real signal (N samples, T time period, dt
sample rate) usi... Problem with IFFT and FFT in Matlab [3 Articles]
waqasabdullah85 - Mar 18 2010
Hi,
I am working on an OFDM system using Matlab. The bits received at the receiver have a constant error ( i.e., avg 200 bits out of 1000 are always wrong).. when I decreased no... fft problem [2 Articles]
lolo_mk1 - Jun 6 2005
Hi
I've been having some problems with the fft() function in matlab. I
ran a simple test...
x = 0:1/460800:0.1; % sample rate = 460800 Hz
fx = sin(2*pi*30000*x); ... FFT/IFFT functions in Maltab & DSP same?
vcte...@yahoo.com - Jul 27 2005
I'm currently doing a project on OFDM signal generation.
I plan to write my codes in Matlab and later convert it into C and then download it into DSPs.
My question is... fft [2 Articles]
tio tio - Dec 18 2003
Dear Members, I acquired one-dimensional data by sound card of my PC with sample frequency 22050 Hz and period of observation (duration) 30 s. I want to apply fft ... ofdm simulation (ifft/fft) & NoiseVar
sundar janaa - Jun 10 2005
Hi all,
I have some problems in simulating the OFDM using
matlab. I will list them one by one.
1). Normailsation of the signal after ifft & fft.
Do we have to multiply b... FFT bands
dean_cvetkovic - May 21 2003
The work I'm doing is to simply determine the FFT analysis of four-
chanell EEG signals.
Can anyone tell me how can I calculate the individual
(mean/max/min/media... fft and pitch
nmoff2003 - Mar 16 2004
hi,
I am using the fft to get pitch. i have a speech sample which i
have divided into frames. i ckeck if the frame is voiced or
unvoiced by geting the energy a... pink noise [2 Articles]
wajid lone - Sep 27 2005
Hi everybody
I m generating pink noise (1/f noise) using following procedure.
1. Generate uniformly distributed white noise.
2. Calculate the fastFourier tr... Higher resolution FFT
Maria Mount - Jan 21 2004
Hi,
Thank u all for being so nice and supporting . Now there is another
technique of getting higher resolution fft i have learned from mathematical
journal withou... Finding peaks
kalyanramu vemishetty - Mar 29 2004
Hi all,
I am analyzing some data using FFT.
Once one perform FFT on signal and get the magnitude,I want to find peaks in the FFT of signal.
... Calculating SNR using FFT
hristo - Sep 21 2005
Hello,
I am trying to calculate the SNR of signal that has just a DC
component. Basically what I do is FFT with Kaiser window and I am not
sure what actually the FFT ... Why this particular code doesnt work? [3 Articles]
Sreeram - Feb 28 2006
sig=wavread('path to signal file');
reconstructed_sig=ifft(fft(sig));
subplot(2,1,sig);
plot(sig);
subplot(2,2.reconstructed_sig);
plot(reconstructed_sig);
i know that to anal... FFT for complex data sequence [4 Articles]
mao mu - Jan 14 2004
Greetings,
Could anybody tell me if FFT works for complex sequences, and how to do it?
If it doesn't, what other ways are available? Thx!
mu
...