general filtering

Started by ajabx in Matlab DSP15 years ago

Hello anyone can please explain me when filtering by FFT, what is the diference between filtering the normal spectrum and iFFT and...

Hello anyone can please explain me when filtering by FFT, what is the diference between filtering the normal spectrum and iFFT and filtering the power spectrum and then iFFT ? which one are best ? thanx


FILTERING - HELP

Started by camdmag in Matlab DSP17 years ago 1 reply

Hello I am new to the group and in fact new to signal processing and filtering and was wondering if anyone could help me with a...

Hello I am new to the group and in fact new to signal processing and filtering and was wondering if anyone could help me with a problem I have filtering in MATLAB. Firstly I should say that I have a large number of waveforms (>5000) and from each wish to extrac


FILTERING QUESTION

Started by camdmag in Matlab DSP17 years ago

Hello I am new to the group and in fact new to signal processing and filtering and was wondering if anyone could help me with a...

Hello I am new to the group and in fact new to signal processing and filtering and was wondering if anyone could help me with a problem I have filtering in MATLAB. Firstly I should say that I have a large number of waveforms (>5000) and from each wish to extrac


2-D digital filtering

Started by Appalayagari Sreedhar in Matlab DSP18 years ago

Dear all, I am working on the 2-D fir filtering, i need to calculate the passband ripple and stopband attenuation for the...

Dear all, I am working on the 2-D fir filtering, i need to calculate the passband ripple and stopband attenuation for the 2-D fir filtering case using matlab, for 1 - D i can use max(H) which will give me the passband ripple and i can calculate the s


filtering

Started by sexy...@hotmail.it in Matlab DSP14 years ago

Hi tu you all! I have a problem of distortion while filtering. I have a signal with bandwith of 10 KHz centered on a carrier frequency of 30...

Hi tu you all! I have a problem of distortion while filtering. I have a signal with bandwith of 10 KHz centered on a carrier frequency of 30 KHz without noise. I'm trying filtering that with a butterworth filter of signal bandwith of 40 KHz centered on 30 KHz using [Bf1,Af1]=butter(5,[wn1 wn2]); y=filtfilt(Bf1,Af1,x); But if i try to compare x and y they are different even if the filte...


Physiological Filtering

Started by chri...@gmail.com in Matlab DSP14 years ago

Hi, I'm recording motor cortex NIRS signals from the human brain where the heart rate(~1.5Hz), respiration(~2Hz) and Mayer wave(~0.1Hz) cloud a...

Hi, I'm recording motor cortex NIRS signals from the human brain where the heart rate(~1.5Hz), respiration(~2Hz) and Mayer wave(~0.1Hz) cloud a lot of the motor signal that is desired. The filtering technique has to be very phase neutral (like FIR not IIR filtering) unlike the filter.m where a dramatic affect occurs in phase shifting. Filtfilt.m is the usual one that is used that is effec...


GUIs for adaptive filtering

Started by sufian in Matlab DSP19 years ago 1 reply

i need to build a GUI in matlab that shows an LMS adaptive filtering system used for noise cancellation can u tell me of good...

i need to build a GUI in matlab that shows an LMS adaptive filtering system used for noise cancellation can u tell me of good sites on this subject... anywhere i can find mfiles or GUIs that do adaptive filtering plz tell of good resources or help thnx


3D filtering.

Started by acetone4u2001 in Matlab DSP15 years ago 5 replies

Hi, I am dealing with 3d data. I am supposed to do a 3d fft followed with a 3d butterworth filter. can somebody tell me how to do it ?...

Hi, I am dealing with 3d data. I am supposed to do a 3d fft followed with a 3d butterworth filter. can somebody tell me how to do it ? ( specificaly multidimensional filtering ? ) -Ankur


~~~ Filtering ~~~

Started by Mithun Aiyswaryan Sridharan in Matlab DSP17 years ago

dear krishnamachary, filtering in the "frequency domain" does not mean convolution in this domain. filtering means u are ...

dear krishnamachary, filtering in the "frequency domain" does not mean convolution in this domain. filtering means u are taking a product of the Fourier transforms of the signal x(n) and the system impulse response h(n). the fourier transforms are X(n) and H(n)


~~~ Filtering ~~~

Started by Mithun Aiyswaryan Sridharan in Matlab DSP17 years ago

dear krishnamachary, filtering in the "frequency domain" does not mean convolution in this domain. filtering means u are ...

dear krishnamachary, filtering in the "frequency domain" does not mean convolution in this domain. filtering means u are taking a product of the Fourier transforms of the signal x(n) and the system impulse response h(n). the fourier transforms are X(n) and H(n)


~~~ Filtering ~~~

Started by Mithun Aiyswaryan Sridharan in Matlab DSP17 years ago

dear krishnamachary, filtering in the "frequency domain" does not mean convolution in this domain. filtering means u are ...

dear krishnamachary, filtering in the "frequency domain" does not mean convolution in this domain. filtering means u are taking a product of the Fourier transforms of the signal x(n) and the system impulse response h(n). the fourier transforms are X(n) and H(n)


IIR filtering Doubt...

Started by bhooshaniyer in Matlab DSP18 years ago 5 replies

Hi everybody, Iam trying to do a filtering on a certain signal,lets say a sine wave consisting of three different frequency...

Hi everybody, Iam trying to do a filtering on a certain signal,lets say a sine wave consisting of three different frequency ranges ie, in real time my signal could consist of any 3 frequencies of the folllowing nature- 1] any one particular fr


Filtering a Plot

Started by Nancy Le in Matlab DSP17 years ago

I was wondering if any of you are familiar with filtering a plot. Here's my problem, I can plot the points, but I need to filter...

I was wondering if any of you are familiar with filtering a plot. Here's my problem, I can plot the points, but I need to filter the plot with the function y(n)=1/3[x(n)+x(n-1)+x(n+1). If anyone knows this, I will really appreciate it if you can help me.   Thanks


Dynamic filtering

Started by SUNIL FRANCIS MENEZES in Matlab DSP19 years ago

** Proprietary ** Hi, I would like to know if anyone has worked on dynamic filtering in digital domain in matlab. The...

** Proprietary ** Hi, I would like to know if anyone has worked on dynamic filtering in digital domain in matlab. The dynamic filter frequency response is varying continously at any given instance Thanks & eagerly waiting for response sunil


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 ...


Re: [Fwd: Re: Re: problem in normalization factor in low pass filter implementation]

Started by Logeshwaran Vijayan in Matlab DSP18 years ago

Hi Premkiran Mannava, The lms algorithm for adaptive filtering is not that complex to implement. just get hold of this book - ...

Hi Premkiran Mannava, The lms algorithm for adaptive filtering is not that complex to implement. just get hold of this book - Adaptive filtering by Simon Haykin hope this helps. logesh. > Premkiran Mannava- > >


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

Started by blue...@yahoo.com in Matlab DSP12 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

Started by pavel_qmed in Matlab DSP13 years ago 1 reply

Hi, I need to know 2 things: 1) the matlab command (if there is any) for 'Matched filtering'. 2) mathematical expression of 'linear Chirp...

Hi, I need to know 2 things: 1) the matlab command (if there is any) for 'Matched filtering'. 2) mathematical expression of 'linear Chirp signal' for Radar systems. I need to compress a linear chirp signal by match filter and display a compressed pulse. Hope I would be assisted. Thanks.


frequency domain filtering?

Started by krishnam acharya in Matlab DSP17 years ago 2 replies

Hi all, this is regarding my doubt in frequeny domain filtering. is it means to say that we convert a signal x(n) into its...

Hi all, this is regarding my doubt in frequeny domain filtering. is it means to say that we convert a signal x(n) into its frequency domain and we get the fourier coefficients which represent the amplitude and phase of the frequency components. then we make the fourier


adaptive filtering+matlab implementation

Started by Fatima Nayyar in Matlab DSP19 years ago

hi all, i need to know about adaptive filtering with matlab implementation for noise cancellation. can anybody help me out?? ...

hi all, i need to know about adaptive filtering with matlab implementation for noise cancellation. can anybody help me out?? thanks fatima