filter

Started by brandon_etheridge in Matlab DSP18 years ago 1 reply

I am trying to filter a column of values to obtain a smooth curve. What is the best method in Matlab to filter these data points. I ...

I am trying to filter a column of values to obtain a smooth curve. What is the best method in Matlab to filter these data points. I seem to run into a problem because I am not filtering a function but rather a column of values. Thanks in advance, Brandon


Filtering PWM in MATLAB

Started by k2lr...@arrl.net in Matlab DSP11 years ago

Hello all. I am relativele new to using MATLAB for DSP related work, and I am looking for some direction/help. I am attempting to model a PWM...

Hello all. I am relativele new to using MATLAB for DSP related work, and I am looking for some direction/help. I am attempting to model a PWM signal, and how the output would look after passing through a filter. I can creat the PWM signal with out a problem. My problem comes when I see the effect a low pass filter would have(just an example). What I am currently doing is I find the FFT, and t...


white noise generation and filtering some band

Started by pent...@hotmail.com in Matlab DSP14 years ago

I have a white nose problem and hope to have your kind advice. I am sorry there must be something wrong in my idea and maybe really dumb. I am...

I have a white nose problem and hope to have your kind advice. I am sorry there must be something wrong in my idea and maybe really dumb. I am not major in DSP and recently this DSP thing drove me crazy. I want to generate a white nose with unite amplitude 0.3 and frequency range from 0 -2.687.(all these values are non-dimensional). I integrated the following to get the signal o


Problems using MATLAB with Microsoft Visual C++ IDE.

Started by Daniele Masini in Matlab DSP19 years ago

I am using an R12 MATLAB evaluation version in order to evaluate its integration with Microsoft Visual C++ 6 IDE. I wish to develop...

I am using an R12 MATLAB evaluation version in order to evaluate its integration with Microsoft Visual C++ 6 IDE. I wish to develop a dll performing an image filtering. It is quite simple if I use fspecial calls only. But if you try to use the edge function (and other similar routines) you


two dimensional tracking

Started by mohan prasad in Matlab DSP17 years ago

Hi everyone, I am working on a kalman filtering problem,but i don't understand how this algorithm is being used for two ...

Hi everyone, I am working on a kalman filtering problem,but i don't understand how this algorithm is being used for two dimensional tracking of the position variables.Unlike LMS,NLMS and RLS algorithm I couldn't figure out what's going on in this kalman filter as it is co


RE: filter function in matlab for awgn

Started by Glen Ragan in Matlab DSP16 years ago

Yes, the filter() function will do filtering. Since you seem to be doing signal detection, you would also be interested in...

Yes, the filter() function will do filtering. Since you seem to be doing signal detection, you would also be interested in convolution, conv(), with the time-reversal of the pattern you wish to detect (matched-filter detection). Glen Ragan -----Original Mes


Simple butter filtering question!

Started by sauw...@gmail.com in Matlab DSP12 years ago 1 reply

Hello everyone, I was wondering if anyone could give me their insight to this problem. I am trying to understand how to use a bandpass filter...

Hello everyone, I was wondering if anyone could give me their insight to this problem. I am trying to understand how to use a bandpass filter in butter to pass only a certain band of frequency. This works for a simple cosine with one frequency, but with a summation of cosines.. dt=.001; %sampling rate Fs=1/dt; %sampling freq HalfFs=Fs/2; t=-10:dt:10; m=cos(2*pi*49*t)+cos(2*pi*50*t); ...


adaptatif filter lms

Started by abir hadrich in Matlab DSP12 years ago 1 reply

hello, im new to the topic of adaptive filters and its implementation in matlab. im doing a project on 'filtering an ECG foetus'. we are...

hello, im new to the topic of adaptive filters and its implementation in matlab. im doing a project on 'filtering an ECG foetus'. we are carrying out all our analysis on an ECG wave with only a powerline interference (60hz). the signal available to us is an ECG wave with a noise component of 60hz, sampled at 360hz.. can you help me implement an adaptive filter using LMS algorithm for this s...


Re: RE: filter function in matlab for awgn

Started by Mandar Rahurkar in Matlab DSP16 years ago

However in the problem specified the filter command is as good as filter you use. There is NO way to filter all the AWGN..if you can...

However in the problem specified the filter command is as good as filter you use. There is NO way to filter all the AWGN..if you can find a way to do that would be HUGE.. Mandar --- Glen Ragan <> wrote: > Yes, the filter() function will do filtering. Sinc


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


Variable cut-off frequency LPF with high oversampling

Started by whee...@yahoo.com in Matlab DSP6 years ago

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...


filter

Started by reshma_jacob in Matlab DSP16 years ago

hii all... i am trying to write C++ code for the filter function in matlab. (y=filter(b,a,x))..can any one tell me wat the filter...

hii all... i am trying to write C++ code for the filter function in matlab. (y=filter(b,a,x))..can any one tell me wat the filter function in matlab actually does...(the steps involved in filtering the data x using the filter coefficients a and b)..since its an inbuilt function


lms notch adaptive filter

Started by el01...@mail.ntua.gr in Matlab DSP12 years ago

hello, > > im new to the topic of adaptive filters and its implementation in matlab. im doing a project on 'filtering an ECG foetus'. we...

hello, > > im new to the topic of adaptive filters and its implementation in matlab. im doing a project on 'filtering an ECG foetus'. we are carrying out all our analysis on an ECG wave with only a powerline interference (60hz). > > the signal available to us is an ECG wave with a noise component of 60hz, sampled at 360hz.. > can you help me implement an adaptive filter using LMS algorithm f


filtering data

Started by brandon_etheridge in Matlab DSP18 years ago

i am attempting to take an excel data file of acceleration values that are plotted over time and filter the data to obtain a curve. ...

i am attempting to take an excel data file of acceleration values that are plotted over time and filter the data to obtain a curve. how do you enter the excel file into matlab and then filter the data using fft. brandon


Curve smoothing in MATLAB

Started by kamran in Matlab DSP15 years ago 1 reply

hi, i m luking for some curve smoothing function in matlab (other than filtering), i have some data but which is not very smooth, so...

hi, i m luking for some curve smoothing function in matlab (other than filtering), i have some data but which is not very smooth, so how i can make a smooth curve. Thank you very much for your help in advance. Regards, Kamran


How to take elements in matrix by user define.....

Started by avadhut in Matlab DSP11 years ago 1 reply

Hello friends, Right now, I am working on spatial filtering in Image processing..for that I want different kind of masks having different...

Hello friends, Right now, I am working on spatial filtering in Image processing..for that I want different kind of masks having different elements...mask size should be 3x3.. I know we can take elements in matrix A by using A=[1 2 3; 4 5 6; 7 8 9] but I want to take these elements by user define... like our scanf function in c langauge...so please tell me how to take such elements...wh...


digital filtering problem

Started by xijingzh in Matlab DSP14 years ago

Please help me, I have been struck here for a long time. Here is my problem I have a real signal in the time domain.I need to remove...

Please help me, I have been struck here for a long time. Here is my problem I have a real signal in the time domain.I need to remove a band of frequency from it to get a new real signal. So first I FFT this input real signal and multiply the FFT ouput by a filter function I chose from matlab. I hope I can get a new power spectrum with that


problem in 8psk demodulation-decision region

Started by raval kunal in Matlab DSP17 years ago 1 reply

Hi everyone, I am trying to simulate 8PSK modulation-demodulation scheme in matlab. The problem arises in the decision making...

Hi everyone, I am trying to simulate 8PSK modulation-demodulation scheme in matlab. The problem arises in the decision making after matched filtering and re-sampling. I am comparing the angles of received signal and taking decision accordingly as shown in the code below


Organisation of spatial frequencies in FFT2 matrix

Started by Anonymous in Matlab DSP15 years ago

Dear all, My questions relate to the filtering of the 2-d Fourier transform of a square image for a certain range of spatial...

Dear all, My questions relate to the filtering of the 2-d Fourier transform of a square image for a certain range of spatial frequencies, using Matlab. The image is Fourier analysed using FFT2 and is arranged with the zero-frequency component in the middle of the spectrum us


Time-frequency denoising

Started by Balaji in Matlab DSP17 years ago

Hi, I'm working on time-frequency analysis for radars and am currently developing an algorithm for signal denoising using...

Hi, I'm working on time-frequency analysis for radars and am currently developing an algorithm for signal denoising using "iterative time- variant filtering" technique in Gabor transform domain. I want to know if somebody else has worked on this technique for any other