call on a file and filtering it with simple procedure, but ??

Started by blue...@yahoo.com in Matlab DSP11 years ago

please check the following programs, the 1st is used to call on a .wav file, change it into a matrix, fft it, filter it, and then rewrite it, but...

please check the following programs, the 1st is used to call on a .wav file, change it into a matrix, fft it, filter it, and then rewrite it, but the problem is the new file is just a file, there is no sound?? the 2nd is the same but without filtering and the same problem arises, I will really appreciate any help !! :) thanks


Matched filtering in matlab

Started by Ishtiaque Ahmed in Matlab DSP12 years ago 3 replies

hello, I need to compress a chirp signal using convolution i.e. by Matched filtering in Matlab. *Can anybody write the steps how to do this...

hello, I need to compress a chirp signal using convolution i.e. by Matched filtering in Matlab. *Can anybody write the steps how to do this in Matlab?? *How can I define an Impulse function and of what kind should it be? What should I do with this impulse function? Thanks.


Noise Filtering from speech signal...Books/Reference Material Please

Started by rajmathi_mehta in Matlab DSP17 years ago 2 replies

Hello everybody, I'm working on a speech related project and want names of books that can give me some good algorithm on noise...

Hello everybody, I'm working on a speech related project and want names of books that can give me some good algorithm on noise filtering. I want to use spectral subtraction or any other related algorithm. Help on how to do it would be of great use Thanks in advance,


doubt on amplitude of fft points

Started by mainraghav in Matlab DSP11 years ago 1 reply

Hi everbody.I have a doubt.I am doing a problem of filtering(fir) in which we have to acquire our carrier precisely ..For that we have to do the...

Hi everbody.I have a doubt.I am doing a problem of filtering(fir) in which we have to acquire our carrier precisely ..For that we have to do the decimation, filtering(LPF) and down conversions(it is areal time application).TO check the frequency I have to do fft at each stage ..NOw the doubt comes is every time I do fft at each stage, the amlitude of fft peak decreases and it becomes very low at ...


frequency response matching

Started by trentki in Matlab DSP12 years ago

Hello! I've got a basic? question regarding filtering. The goal with the filtering is to match four frequency response source curves...

Hello! I've got a basic? question regarding filtering. The goal with the filtering is to match four frequency response source curves against two target curves. Let us call the target curves goal1 and goal2 and the source curves source1, source2, source3 and source4. What I would like to do (I think!) is to solve the equation system below. That is, for a specific frequency 0 < f < fs


how do i use an adaptive filter for filtering an ECG wave

Started by puneetha achar in Matlab DSP13 years ago 1 reply

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

hello, im new to the topic of adaptive filters and its implementation in matlab. im doing a project on 'filtering and analysis of an ECG wave'. 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 200hz..the file is in .dat format. we have been able to impl...


adaptive Median filtering

Started by hariza in Matlab DSP14 years ago 1 reply

i have the source code for adaptive median filtering.but when i run this code,it has an error..i'm new to matlab ..below are some of the ...

i have the source code for adaptive median filtering.but when i run this code,it has an error..i'm new to matlab ..below are some of the code ip_edge = zeros (212,276); ip_convert = double (ip); the error is below.. ip_edge (11:202, 11:266) = ip_edge (11:202, 11:266) + ip_convert; can anybody tell me


wiener filtering

Started by "Hi, There" in Matlab DSP13 years ago 5 replies

Hi, There, Anyone use wiener filter to remove noise of one-dimension signals? I appreciate it very much if you can suggest any papers?...

Hi, There, Anyone use wiener filter to remove noise of one-dimension signals? I appreciate it very much if you can suggest any papers? Matleb codes are welcome. Thanks, Frank


how to transfer sound to simulink

Started by m_elneanaei elneanaei in Matlab DSP10 years ago

i records a voice signal in command line? and saves it in a variable and i want to tranfer it to simulink to do some processes as filtering...

i records a voice signal in command line? and saves it in a variable and i want to tranfer it to simulink to do some processes as filtering ,modulation ,....


filtering?

Started by Maryam Amoui in Matlab DSP13 years ago 5 replies

Hi; How can we filter 2 signals from eachother. for example,I have a signal which is the ECG of mother & also baby toghether,how can I...

Hi; How can we filter 2 signals from eachother. for example,I have a signal which is the ECG of mother & also baby toghether,how can I seperate these two from eachother & also ,how can I separate noise of city voltage? I will be very glad if someone answers me. thanks, maryam


fft and frequency filtering

Started by ferhatdegirmenci in Matlab DSP14 years ago

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...

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 much about filters. Please help me


Filtering EEG signals

Started by Anonymous in Matlab DSP18 years ago

Does any out there know how to accuratley filter frequencies in 0.2 Hz bins....exactly? Which filter, order number, etc. would...

Does any out there know how to accuratley filter frequencies in 0.2 Hz bins....exactly? Which filter, order number, etc. would be most useful. Thanks Magnut


Filtering 3d Data

Started by simon connol in Matlab DSP16 years ago

Hi guys !! First of all, I'd like to say that this group is really excellent, atleast we people who have questions regarding...

Hi guys !! First of all, I'd like to say that this group is really excellent, atleast we people who have questions regarding Matlab can communicate with Other people. you all guys great ...... Now here is a question which I have, I know if I want to


watermarking in images

Started by balaji62002 in Matlab DSP16 years ago

hi all, Is anyone doing a project in 'feature based digital image watermarking'? if so, mail me.i want know more abt mexican hat ...

hi all, Is anyone doing a project in 'feature based digital image watermarking'? if so, mail me.i want know more abt mexican hat filtering using matlab.waiting for the reply. friendly, bala.


2-D filtering

Started by Osman Arslan in Matlab DSP16 years ago

I would like to design a 2-D stopband filter and use it to filter some images in time domain. The butter() command can design...

I would like to design a 2-D stopband filter and use it to filter some images in time domain. The butter() command can design butterword stopband filters but it is 1-D. Thanks, Osman __________________________________


Adaptive Filtering of QAM Signals

Started by Mahdi in Matlab DSP16 years ago

Hi everybody, I have a QAM signal corrupted by a colored/AWGN noise. I would like to filter it. The problem is that QAM has not...

Hi everybody, I have a QAM signal corrupted by a colored/AWGN noise. I would like to filter it. The problem is that QAM has not constant spectrum. Anybody has or has seen a solution? tnx 2 much, Mehdi


help using imfilter.....

Started by narcolepsyfreak in Matlab DSP16 years ago

i want to do an average filtering to a binary image. here's how i do it : i = imread('someimage.bmp'); fil = ones(3,3)/9; ...

i want to do an average filtering to a binary image. here's how i do it : i = imread('someimage.bmp'); fil = ones(3,3)/9; i2 = imfilter(i,fil,'replicate'); and then i compare it to a code that i wrote. it essentially calculates the avg ofa 3x3 neighborhood.


Filtering Algorithm Selection

Started by Vinu V in Matlab DSP16 years ago

Hi, I am designing an obstacle detection system using SONAR. I am using a 50Khz signal for transmiting. The application needs...

Hi, I am designing an obstacle detection system using SONAR. I am using a 50Khz signal for transmiting. The application needs to determine the exact frequency of the echo received from the obstacles. The expected range of the echo signals is 45 - 55 Khz and I need an accuracy


filter

Started by brandon_etheridge in Matlab DSP17 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 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