Gaussian filter

Started by enriquefergosa in Matlab DSP17 years ago

Hallo. I am trying to do a gaussian filter using the matlab function H = FSPECIAL('gaussian',HSIZE,SIGMA). I need to do that the ...

Hallo. I am trying to do a gaussian filter using the matlab function H = FSPECIAL('gaussian',HSIZE,SIGMA). I need to do that the height of the gaussian is one (that is that the gaussian goes from zero to one)while the parameter SIGMA is varied to change the wide of the base. How cou


PDF for four Gaussian Distributed numbers multipiled together (a^4)

Started by Vimal in Matlab DSP14 years ago 6 replies

Dear All, In my work I am using MATLAB function RANDN to generate zero mean and variance 1 random numbers. I know the PDF for this is...

Dear All, In my work I am using MATLAB function RANDN to generate zero mean and variance 1 random numbers. I know the PDF for this is Gaussian which is well defined in literature and I can find loads of information on it. But in my work I happened to get four different Gaussian numbers multiplied together i.e.: a4 = a*a*a*a (where a is a Complex Gaussian number) I am interested in anal


Gaussianity -QUery

Started by utd_anurag in Matlab DSP16 years ago 5 replies

HI I have a question: 1). Why do we, in most of the cases, assume a noise to be GAUSSIAN? 2). What are characteristics...

HI I have a question: 1). Why do we, in most of the cases, assume a noise to be GAUSSIAN? 2). What are characteristics of Gaussian pulse? 3). what is the difference between "White gaussian Noise (WGN)" & "Additive White gaussian No


Noise

Started by muyeen NAWAZ in Matlab DSP18 years ago 1 reply

Hi A complex Gaussian noise process is given by x(t)+j*y(t). Where processes x and y are both gaussian. To implement this...

Hi A complex Gaussian noise process is given by x(t)+j*y(t). Where processes x and y are both gaussian. To implement this do I generate x and y using a gaussian genertin function using the same seed? please advice. regards Muyeen


Seperability of a 2D derivative of a Gaussian

Started by shlomo_kashani in Matlab DSP14 years ago

Hi, I am trying to compare the results between convolving an image *once* with a 2D derivative of a Gaussian *matrix* and between convolving...

Hi, I am trying to compare the results between convolving an image *once* with a 2D derivative of a Gaussian *matrix* and between convolving *twice* once in the X direction and once in the Y direction with a 1D derivative of a Gaussian *vector* (using the seperability property of the derivative of a Gaussian). I wrote two functions, one for generating the vector and one for generati...


Gaussian fit

Started by k.al...@surrey.ac.uk in Matlab DSP13 years ago 3 replies

Hello all, I want to do gaussian fitting? can any one please let me know the function that does gaussian fitting? Many thanks in...

Hello all, I want to do gaussian fitting? can any one please let me know the function that does gaussian fitting? Many thanks in advance. --------------------------------------------------------------- Khalid Alzimami Department of Physics School of Electronics & Physical Sciences University of Surrey Guildford, Surrey, GU2 7XH UK tel. +44-1483-682697 fax. +44-1483-682724...


Generate non-Gaussian Noise

Started by aksh...@gmail.com in Matlab DSP13 years ago 1 reply

Hello everyone, > From what I understand, Matlab's rand and randn functions generate Gaussian noise. Lets say I have a non-Gaussian PDF...

Hello everyone, > From what I understand, Matlab's rand and randn functions generate Gaussian noise. Lets say I have a non-Gaussian PDF (Poisson, Middleton etc etc). Given the PDF, how do I generate the noise?? Thanks Regards Akshaya Srivatsa


Gaussian pdf

Started by rmartis80 in Matlab DSP13 years ago

Dear Sir, I am working on Gaussian random Process, where I am stuck from few days because of the following two difficulties. 1. I have...

Dear Sir, I am working on Gaussian random Process, where I am stuck from few days because of the following two difficulties. 1. I have different segments of Gaussian distributed random sequences, of which two sequences among them are templates . I need to find the joint pdf and thereby marginal pdf between a segment and the templates. And thereby the probability of the segment bei...


Generate Gaussian Noise

Started by sharma rohit in Matlab DSP16 years ago 2 replies

Hi! Folks I know that randn would generate a set Gaussian samples. But if I need to add gaussian noise to my signal such that...

Hi! Folks I know that randn would generate a set Gaussian samples. But if I need to add gaussian noise to my signal such that the noise power is some value  N , how do I do it? How would the variance (that I would give to my rand f


integral of the Gaussian PDF

Started by #ARIJIT BISWAS# in Matlab DSP13 years ago 2 replies

Hi all! How do I find the integral of the Gaussian pdf in MATLAB? see e.g. http://mathworld.wolfram.com/NormalDistribution.html Is it like...

Hi all! How do I find the integral of the Gaussian pdf in MATLAB? see e.g. http://mathworld.wolfram.com/NormalDistribution.html Is it like 0.5*erfc(-X/sqrt(2))? Best Regards, Arijit


Re: UWB Gaussian Polycycles

Started by tayyar guzel in Matlab DSP16 years ago

Hi Divya, I don't know of any other way to generate gaussian polycycles, nonetheless, I can tell you how you can use matlab's...

Hi Divya, I don't know of any other way to generate gaussian polycycles, nonetheless, I can tell you how you can use matlab's built-in functions to generate four monocycles. Here it is: N =12; n= 0:N-1; fc=3E9; fs=10E9; % here is your data, jus


Re: UWB Gaussian Polycycles

Started by Anonymous in Matlab DSP16 years ago

Hi Divya, I don't know of any other way to generate gaussian polycycles, nonetheless, I can tell you how you can use matlab's...

Hi Divya, I don't know of any other way to generate gaussian polycycles, nonetheless, I can tell you how you can use matlab's built-in functions to generate four monocycles. Here it is: N =12; n= 0:N-1; fc=3E9; fs=10E9; % here is your data, jus


Mixed Gaussian Curves in Matlab

Started by Parag Shah in Matlab DSP16 years ago

Hi All, I have a chromatogram which is basically obtained by overlapping mixed Gaussian curves. I need to find out what the...

Hi All, I have a chromatogram which is basically obtained by overlapping mixed Gaussian curves. I need to find out what the components of this resultant curve are. Can someone help me to how to do this using Matlab? Thanks Parag.


Regarding probability of Gaussian distribution

Started by Roshan Martis in Matlab DSP14 years ago

Hi Everybody, I am working on pattern matching of EEG signals. Also I am new to this area. First I segmented the EEG. Each segment is...

Hi Everybody, I am working on pattern matching of EEG signals. Also I am new to this area. First I segmented the EEG. Each segment is of 200 samples. I have such 64 vectors. I made two templates. One is normal EEG and the other one is abnormal EEG. All the 64 vectors cluster around these two patterns. The probability of a vector belonging to a cluster is Gaussian distributed. The prob...


filtering additive white gaussian complex noise

Started by anjankumarkundu in Matlab DSP14 years ago

i would like to filter the additive white gaussian coplex noise.please inform me about the filters available to eliminate the above noise.I am...

i would like to filter the additive white gaussian coplex noise.please inform me about the filters available to eliminate the above noise.I am doing my coding with Matlab. Anjan Kumar Kundu Professor University of Calcutta India


gaussian shape bell curve

Started by darr...@msn.com in Matlab DSP10 years ago 1 reply

Hi Experts, I am a beginner at using matlab and as such have come across a problem that I neither understand nor know how to...

Hi Experts, I am a beginner at using matlab and as such have come across a problem that I neither understand nor know how to implement in matlab. I want to plot a gaussian aperodic shape in matlab with an amplitude of 1 and a width of 1, I know that I could use Gausspuls command however I want to plot by using basic programming constraints. Could someone please give a push in t...


Using fft to obtain power spectral density of a gaussian distribution

Started by Anonymous in Matlab DSP19 years ago

Hi, I am currently writing this programme to simulate the AWGN using the rand function in C and the polar box muller algorithm. I...

Hi, I am currently writing this programme to simulate the AWGN using the rand function in C and the polar box muller algorithm. I managed to simulate a series of random numbers of gaussian distribution with variance 1 and mean 0. I would like to now test using fft the power spe


add White Gaussian Noise

Started by carriew121 in Matlab DSP16 years ago

Hi,I have got 4 digital signals (BPSK modulation) and each of them have 10 symbols.I need to add white Gaussian Noise.but I...

Hi,I have got 4 digital signals (BPSK modulation) and each of them have 10 symbols.I need to add white Gaussian Noise.but I don't know how to do it using function "awgn" or "wgn"? how can I write the Matlab code for that? cheers....


Calculation of Noise for a given SNR

Started by Steve Thomas in Matlab DSP13 years ago

Hello All, I am trying to find the right method of finding the noise power to extrapolate from the SNR value. I have a signal in a variable y...

Hello All, I am trying to find the right method of finding the noise power to extrapolate from the SNR value. I have a signal in a variable y which is a second derivative Gaussian pulse: I normalized to make it 2v peak to peak Fs=5E9;%sample rate-10 times the highest frequency t=[(-25E-9):ts:(400)*1E-9)]; ts=1/Fs;%sample period y = SEC_GAUSN[x] % y is a second derivative gaussian p...


nonlinear curve fitting- help needed

Started by pallaviteredesai73 in Matlab DSP15 years ago

Hi, I am a new matlab user and am fitting a spectrum to a sum of 5 Gaussian lineshapes. I managed to do this using a custom equation....

Hi, I am a new matlab user and am fitting a spectrum to a sum of 5 Gaussian lineshapes. I managed to do this using a custom equation. But I have following difficulties. (1) I want to save the fitted curve as a two column data file. How to do this? (2) I want to simulate/generate individual five Gaussian lineshapes (knowing the fitted parame