Low-pass filter design

Started by Hugo de Paula in Matlab DSP17 years ago

Hi everybody, Low-pass filter design is considered trivial and Matlab makes it even easier, but I would like some advice in...

Hi everybody, Low-pass filter design is considered trivial and Matlab makes it even easier, but I would like some advice in this situation. I would like a low-pass filter with attenuation in the transition band of 30 dB. the transition band should be 5% of the cut-off


Digital Filter Design

Started by rol015 in Matlab DSP16 years ago 1 reply

G'day! Does anybody know how to "design a filter" (like done in the FDA toolbox) from the MATLAB command window? I have all the...

G'day! Does anybody know how to "design a filter" (like done in the FDA toolbox) from the MATLAB command window? I have all the filter parameters being inputted from variables in the command window, but just can't design the whole thing. The purpose is to run an


BandPass FIR filter using Windowing

Started by mike...@comcast.net in Matlab DSP11 years ago 2 replies

I am working on a school project, and I need to create a Linear phase, causal, digital Bandpass FIR filter using windowing methods. with the...

I am working on a school project, and I need to create a Linear phase, causal, digital Bandpass FIR filter using windowing methods. with the following specifications. Sampling fs= 24khz Passband freq= p1= 2*pi*4000, and p2= 2*pi*8000 rad/sec stopband freq= st1=2*pi*3000 st2=2*pi*9000 rad/sec Minimum stopband attenuation = 40db having the lowest possible filter length. I fou...


query- Constrained equiripple filter transfer function

Started by bssr...@gmail.com in Matlab DSP14 years ago 2 replies

Hi, I am working on a project where the design of a Constrained equiripple filter/ Generalized equiripple filter was indicated . could someone...

Hi, I am working on a project where the design of a Constrained equiripple filter/ Generalized equiripple filter was indicated . could someone please send me the transfer function of these filters or a material relating to the same .I would be much obliged. srinivasa


filterbanks problem?

Started by omid...@yahoo.com in Matlab DSP13 years ago

This MATLAB program is for making a suitable wavelet kernel It derives the Low pass filter by sampling from analog raised cosine function in...

This MATLAB program is for making a suitable wavelet kernel It derives the Low pass filter by sampling from analog raised cosine function in frequency domain and taking ifft from this function to yield the impulse response. (other filters are derived using orthogonal relations). first i wnat know if the filter design method has any problems? The filter has 2 parameters in frequency domain ...


Re: problems implementing 8th order bessel-filter

Started by Jeff Brower in Matlab DSP12 years ago

Dwisu- > hi, I'm trying to low-pass filter my input signal with an 8th order > bessel filter, cut-off at 2500Hz. > > my code goes like...

Dwisu- > hi, I'm trying to low-pass filter my input signal with an 8th order > bessel filter, cut-off at 2500Hz. > > my code goes like that: > > [b,a] = besself(8,1250/5000); > filteredSignal = filtfilt(b,1,inputSignal); > > Problem: the filtered vector doesn't show ANY difference in shape > compared to the original input signal, except that it has a much > lower magnitude. If I s


EMQF filter (elliptic minimal-Q factors filter)

Started by Diaconu adrian in Matlab DSP8 years ago

Hi, I am tring to resolve a probleme with an EMQF filter with the order 9 but i can't find the correct function to address this kind of filters....

Hi, I am tring to resolve a probleme with an EMQF filter with the order 9 but i can't find the correct function to address this kind of filters. I have found on a site that a function that addresses this kind of filters is apellip_du ( i am adding the link to this information so that anyone who will want to help me, will check it out if they don't belive me) but this functions didn't work in neit...


EMQF filter (elliptic minimal-Q factors filter)

Started by Diaconu adrian in Matlab DSP8 years ago

Hi, I am tring to resolve a probleme with an EMQF filter with the order 9 but i can't find the correct function to address this kind of filters....

Hi, I am tring to resolve a probleme with an EMQF filter with the order 9 but i can't find the correct function to address this kind of filters. I have found on a site that a function that addresses this kind of filters is apellip_du ( i am adding the link to this information so that anyone who will want to help me, will check it out if they don't belive me http://vadkudr.org/Algorithms/EMQFd...


recursive frequency sampling filter design

Started by Appalayagari Sreedhar in Matlab DSP17 years ago

Dear all, my problem straight away, i am doing recursive frequency sampling filter design, in matlab i design the...

Dear all, my problem straight away, i am doing recursive frequency sampling filter design, in matlab i design the filter coefficients, i gave the format long at the top and received the 15 digits for representation after decimal point. does this give


Bessel filter

Started by ddeneef in Matlab DSP18 years ago

Hi, I need to use a 5th order Bessel filter in Simulink, and I found the "analog filter design" block in the DSP Blockset menu....

Hi, I need to use a 5th order Bessel filter in Simulink, and I found the "analog filter design" block in the DSP Blockset menu. This block uses the "besself" function to perform this operation. But with this function I don't have an attenuation of -3 dB at


problem in getting execution time in MATLAB

Started by label comments in Matlab DSP12 years ago

hello everyone, i am Mahantesh from BASAVESHWAR ENGG COLLEGE,BAGALKOT. INDIA we are doing our final year project on polyphase implementation of...

hello everyone, i am Mahantesh from BASAVESHWAR ENGG COLLEGE,BAGALKOT. INDIA we are doing our final year project on polyphase implementation of fir filter banks using MATLAB .we have used a kaiser window digital filter in this.our aim of project is to implement the polyphasing of filter such that it reduces the time needed for convolution with any large input signal like speech and image signal...


matlab program for comb filter design

Started by pritam kumar das in Matlab DSP17 years ago 2 replies

hi everyone, i am doing my project in 'comb filter design'..as such if anybody would be heplful enough to provide me the...

hi everyone, i am doing my project in 'comb filter design'..as such if anybody would be heplful enough to provide me the algorithm/program for comb filter design using matlab..it would be substantiative for me.. pritam..


How to test filter is working or not

Started by Sridhar gadda in Matlab DSP15 years ago 4 replies

Hello,               I tested digital filter by giving the sweep signal.  Is there any other method to...

Hello,               I tested digital filter by giving the sweep signal.  Is there any other method to basically check, filter is working or not ??     


Filter a known signal from another

Started by brownsugar4all in Matlab DSP12 years ago

Hi all, Given an estimate of a signal(x) I want to know how to do two things 1) How to filter out this estimate(x) from another signal say...

Hi all, Given an estimate of a signal(x) I want to know how to do two things 1) How to filter out this estimate(x) from another signal say y. 2) How do I create an adaptive filter of my estimate so that I can update it when I come across new parameters. Thank you


freqz vs FFT question

Started by rudy...@yahoo.com in Matlab DSP7 years ago

Hi, I have always been confused about this two functions. Can someone please clarify why they behave this way? Let me give an example To me...

Hi, I have always been confused about this two functions. Can someone please clarify why they behave this way? Let me give an example To me it looks like that if we compute the impulse response of a filter, it should be the same thing as taking the FFT of that filter. But how come there is a difference? For example, let's say if I take the simple FFT of the following hamming window: L...


frequency sampling filter design code

Started by Appalayagari Sreedhar in Matlab DSP17 years ago 1 reply

Hi, I am sreedhar. i am some problem with designing the frequency sampling fir filter, i need a frequency sampling...

Hi, I am sreedhar. i am some problem with designing the frequency sampling fir filter, i need a frequency sampling filter design matlab code, actually i want to do the design using the genetic algorityhm, but i am confused with the selection of length of th


Doubt in implementation of linear phase iir filter

Started by sham ganth in Matlab DSP17 years ago

Sir, Iam trying to implement Linear phase IIR filter in Matlab. Iam a Post Graduation Student from South india. I need your help....

Sir, Iam trying to implement Linear phase IIR filter in Matlab. Iam a Post Graduation Student from South india. I need your help. My basic refrence is "A technique to realize linear phase iir filter" by Powell and Chou. IEEE signal processing paper. Iam having doubt in


Gaussian filter

Started by Giovanni Marino in Matlab DSP10 years ago

Dear All, I am trying to denoising some simulated images by using a Gaussian filter. I would check if my results are right by deconvolving the...

Dear All, I am trying to denoising some simulated images by using a Gaussian filter. I would check if my results are right by deconvolving the output images in the frequency domain. Suppose that Image_out is the output of my filter, in the frequency domain we should get: F(Image_out)=F(Image_inp)*F(Filter_Gaus), where F() represent the Fourier transform. As a consequence the deconvolution re...


pulse shaping by raised cosine filter

Started by mahboobeh gharib in Matlab DSP12 years ago

Hi ?I have a question about pulse shaping by the raised cosine filter. ?I select roll-off factor = 0.2.?Fs/Fd=4 , delay= 9 , 10 , 11 , 12 ,...

Hi ?I have a question about pulse shaping by the raised cosine filter. ?I select roll-off factor = 0.2.?Fs/Fd=4 , delay= 9 , 10 , 11 , 12 , ... ?I increase the length of the filter .? ?Frequency response is better in results. ?I write a vhdl code for it. I synthesis it in FPGA. ?I expect that frequency response is better. S/N? is better , ?But is not. why? ? thanks "gharib"


filter design

Started by elham askari in Matlab DSP10 years ago

hi dears I?have designed? a chebyshev 1 filter by?matlab by impulse invariance method with these below codes now I want to perform this filter...

hi dears I?have designed? a chebyshev 1 filter by?matlab by impulse invariance method with these below codes now I want to perform this filter on an image and see the result effect on this image, so how can do this? with which code in matlab??please help me. % Chebyshev type I polynomials, Impulse Invariance, Method 1 clear all; close all;clc; wp=.2*pi,ws=.3*pi,dp=1,ds=15,Fs=1; [n,wc]=cheb...