## Forums matlab

## MATLAB Impulse response of a Comb filter

Hi, I am an FPGA engineer , new to MATLAb and DSP , and immersed in DSP study. Today's exercise is plotting the unit impulse response for a Comb...

Hi, I am an FPGA engineer , new to MATLAb and DSP , and immersed in DSP study. Today's exercise is plotting the unit impulse response for a Comb filter of the form: yc(n) = x(n) - x(n-4) I wrote the following code: n1 = 0; n0 = 10; % t = 0 n2 = 100; % n2 - n1 = Length of impulse response in vector [x,n] = impseq(n0,n1,n2); % Generates unit impulse sequences, x(n0) = 1, others 0 % Dif...

## Get PSD from a dat file analytically

inHi everyone, I would like to get the power spectral density from a random data numbers. Can I get this analytically after processing with...

Hi everyone, I would like to get the power spectral density from a random data numbers. Can I get this analytically after processing with matlab. Thank you.

## Matlab obtaining power spectrum from ACF and FFT

Greetings, I am using Matlab R2012b 64-bit on Windows 7 in order to estimate the power spectrum of a simple signal that is: cos(10*t) +...

Greetings, I am using Matlab R2012b 64-bit on Windows 7 in order to estimate the power spectrum of a simple signal that is: cos(10*t) + sin(20*t) defined in the time interval from 0.0 to 10.0 Here is what I did: 1) There was no predefined value of points so I took 1001 points by forming a time array and sampled the function at these points. 2) I calculated the autocorrelation function of the ...

## Frequency Estimation

Hi Folks, I don't know if this is the proper place to ask about DSP for Radar using Matlab, but I will give it a chance since there is no...

Hi Folks, I don't know if this is the proper place to ask about DSP for Radar using Matlab, but I will give it a chance since there is no dedicated Radar Forum I am using Matlab to perform distance measurements given by a FMCW Radar. My case is an object moving away or toward the radar (up to 20 meters). I need to estimate the IF frequency to calculate my distance. Currently, I break down the ...

## hilbert transform

Hello, I try to get the Hilbert transformed for a chaotic signal in order to have two signals completely orthogonal -> Chotic signal and Hilbert...

Hello, I try to get the Hilbert transformed for a chaotic signal in order to have two signals completely orthogonal -> Chotic signal and Hilbert Transform of chaotic signal in MATLAB all goes well, I have a good hilbert transformed with the proper phase and all, basically it is the signal which I expected . when I try to do it in simulink , I found on the net two methods to obtain hilbert t

## Variable cut-off frequency LPF with high oversampling

Hello all, I'm using a Xilinx Kintex-7 FPGA to do some low-pass filtering using System Generator/Simulink, and had a question about the...

Hello all, I'm using a Xilinx Kintex-7 FPGA to do some low-pass filtering using System Generator/Simulink, and had a question about the architecture of the filter. My requirements include having to use a fixed sampling rate of 80MSPS. This can't really change. I appreciate the difference b/w sample rate of the filter and the clock rate of the DSP primitives in the FPGA. The customer wants...

## Spectrogram from Complex Morlet wavelet ( recreating article result from data)

I am trying to recreate the following results: http://i.stack.imgur.com/muMxX.jpg from the following data: ...

I am trying to recreate the following results: http://i.stack.imgur.com/muMxX.jpg from the following data: https://www.dropbox.com/s/mi3szqgzgku29rn/FS40.dat the time is in milliseconds (frequency is 40000 Hz) The article state that they used Complex Morlet wavelet to create the spectrogram: " Power estimates from the averaged LFPs were calculated from time?frequency spectrogr

## complex FM demodulation

I was wondering if anybody knows the algorithm for Matlab's complex FM demodulation function. I need to correlate bench data to test data and I...

I was wondering if anybody knows the algorithm for Matlab's complex FM demodulation function. I need to correlate bench data to test data and I need to write the complex FM demodulation in visual basic. A block diagram would work as well. Thee seem to be a few different methods out there, some quite involved.

## Spectral Entropy of a signal and its physical significance

inHi, I would like to know about the spectral entropy of a signal and what does it mean in physical world. As I understand, the spectral entropy of...

Hi, I would like to know about the spectral entropy of a signal and what does it mean in physical world. As I understand, the spectral entropy of a particular frequency band gives the energy distribution of the signal. High value of entropy indicates the existence of a sharp peak in that frequency band. Is that right? Your response will be highly appreciated. Thanks in advance.

## spectrum

inDeal all; I have used the Yule-Walker method (pyulear) to get a PSD (i.e. [Pxx,f] = pyulear(x,p,nfft,fs) ). p is the order of an AR model for the...

Deal all; I have used the Yule-Walker method (pyulear) to get a PSD (i.e. [Pxx,f] = pyulear(x,p,nfft,fs) ). p is the order of an AR model for the sign. How can I determine the optimal value of p?