wiener filter implemntation.

Started by "Anil.M.S" in Matlab DSP14 years ago

Hi, I am currently working on a speech enhancement project. I am implementing a noise cancellation system using Wiener filter. > From what I...

Hi, I am currently working on a speech enhancement project. I am implementing a noise cancellation system using Wiener filter. > From what I read in the text books and from the net , I got the transfer function for the filter as h(f) = {psd(noisySignal) - psd(noiseSignal) }/psd(noisySignal). I implemented this in matlab ,but the result was a highly distorted signal. I have given my proced


Remez Filter Design in MATLAB

Started by Anonymous in Matlab DSP19 years ago 1 reply

Hi There, Can any one tell me how to design a low pass FIR filter using remez exchange algorithm in MATLAB. An...

Hi There, Can any one tell me how to design a low pass FIR filter using remez exchange algorithm in MATLAB. An example will be highly appreciated. I tried with some parameters but it says filter could not converge. Thanks!!! --Sur


Volterra filter design

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

How can I design a 2nd order Volterra filter with any "input + noise". Output should be noise free. If anyone can give me an example? Also how...

How can I design a 2nd order Volterra filter with any "input + noise". Output should be noise free. If anyone can give me an example? Also how can I represent above filter in state variable form. Any help, pointers, are greatly appreciated. Thanks


FIR Filter with Multiple Zeros.

Started by Nitin Nangare in Matlab DSP19 years ago

I would be greatly obliged if some one could tell me How to Design FIR filter with Multiple Zeros using Matlab filter routine. ...

I would be greatly obliged if some one could tell me How to Design FIR filter with Multiple Zeros using Matlab filter routine. Thanks is advance for your co-operation. Regards, Nitin 


Changing sampling frequency

Started by kn srivastava in Matlab DSP10 years ago 3 replies

I have a digital filter that is designed for 1kHz sampling frequency. Everything else remaining the same, I want that filter to work for 4...

I have a digital filter that is designed for 1kHz sampling frequency. Everything else remaining the same, I want that filter to work for 4 kHz sampling frequency. What do I need to do? I am not a filter guy and my background is power system. That is why I am asking you here this basic question. Kailash


notch filter-doubt

Started by vani chezhiyan in Matlab DSP16 years ago

hi all, i'm doing preprocessing of ecg signals. i have an ecg signal with sampling frequency 1000hz. i have lowpass filtered &...

hi all, i'm doing preprocessing of ecg signals. i have an ecg signal with sampling frequency 1000hz. i have lowpass filtered & then highpass filtered the signal.now that i want to use a notch filter or comb filter to remove the powerline interference at 60hz( ,180,300,420,5


Exponenital Filter design

Started by gordon_ao in Matlab DSP15 years ago 5 replies

Hello Folks At the moment I am trying to design a one pole simple IIR digital filter to simulate thermal heating and...

Hello Folks At the moment I am trying to design a one pole simple IIR digital filter to simulate thermal heating and cooling delay effect with simple equations like 1 - e^(-t/T), where T is a known time constant. I think an one pole IIR filter will do it: Y[n]


filter bank in matlab

Started by NAVNATH NEHE in Matlab DSP16 years ago 1 reply

hi,  i am working on speech recognition. I have to implement a filter bank ( IIR Filter) from  range 200Hz to 3000Hz. Can...

hi,  i am working on speech recognition. I have to implement a filter bank ( IIR Filter) from  range 200Hz to 3000Hz. Can anybody help me?   NSN


Low - pass filter explanation

Started by szuc...@gmail.com in Matlab DSP10 years ago

Hi all, I have some basic questions regarding a low-pass filter. I have never studied audio signal processing that's why my questions might...

Hi all, I have some basic questions regarding a low-pass filter. I have never studied audio signal processing that's why my questions might seem trivial for most of you. So I have to design a low-pass filter. Here is the way I do it. I have my matrix with the signals signalMatrix. I create a FFT so I do : newVector = fftsfift(fft(signalMatrix)); Here is my first question : what do I get n...


query about optimizing all pass filter parameters

Started by kimm...@yahoo.co.in in Matlab DSP9 years ago

I have a function H(f) = 10 ?(?*L/10)exp ?j[ D*?0^2*L*?^2/ (2*c)] . And ?ap(phase of all pass filter in frequency domain) is a function of T, r,...

I have a function H(f) = 10 ?(?*L/10)exp ?j[ D*?0^2*L*?^2/ (2*c)] . And ?ap(phase of all pass filter in frequency domain) is a function of T, r, ?0 and f. Expression of ?ap is known. I have to optimize all pass filter parameters T, r, ?0 such that minimum mean square condition is achieved MMSE( T, r, ?0 )= ? { arg( 1/ H(f) ) ? ?ap( T, r, ?0, f) }^2 [Note: Summation


Problem implementing Fast transversal RLS filter

Started by shomik chakraborty in Matlab DSP15 years ago

Dear Sir(s), I am a M.Tech student studying Signal Processing. I have to implement Fast Transversal RLS filter for my ...

Dear Sir(s), I am a M.Tech student studying Signal Processing. I have to implement Fast Transversal RLS filter for my project. I implemented the code following Simon Haykin but the code doesnt work. The filter weights are updated but the


how to design an sinc(x).^3 compensated IIR filter in matlab

Started by subrahmanya ks in Matlab DSP15 years ago

Hi, how to design an sinc(x.^3 compensated IIR lowpass filter in matlab?. filter specification are allowed passband ripple = 0.1dB ...

Hi, how to design an sinc(x.^3 compensated IIR lowpass filter in matlab?. filter specification are allowed passband ripple = 0.1dB sampling frequeny = 200kHz cutoff frequency = 15e3; stopband level = -120dB.


IIR filter settling Problem

Started by gordon_ao in Matlab DSP16 years ago

Dear all, A very basic question actually. Just found an issue with IIR low pass filter in decimation low pass chain after a 3rd...

Dear all, A very basic question actually. Just found an issue with IIR low pass filter in decimation low pass chain after a 3rd order SINC filter in a Sigma Delta A/D system. The one bit input code from Sigma Delta modulator is 1010101010... forever which is supposed to


Multiband analogue elliptic filter

Started by sofeyaluzuko in Matlab DSP17 years ago

Hi everybody, I'm designing an analogue elliptic stopband filter to filter out more than one frequency band. I'm able to get the ...

Hi everybody, I'm designing an analogue elliptic stopband filter to filter out more than one frequency band. I'm able to get the transfere function for each band by transfering the lowpass to bandstop using a matlab function ie. [newnum newden] = lp2bs (num,den,Wc,Bw). I'm not able t


Minimum lag high pass filter for very low frequencies

Started by robe...@gmail.com in Matlab DSP7 years ago

Hello, I was hoping I could get some help on designing a high pass filter for very, very low frequency signals (relative to the sampling...

Hello, I was hoping I could get some help on designing a high pass filter for very, very low frequency signals (relative to the sampling rate). The frequencies I'm looking at are: 20Hz sampling, I want to filter off everything below 1/30Hz (or 1/15 if that's the best I can do). My application is very lag and phase shift sensitive. I have to double integrate this filtered signal, and the bett...


recursive frequency sampling filter design

Started by Appalayagari Sreedhar in Matlab DSP17 years ago 1 reply

Dear all, I am working on the recursive frequency sampling filter design. My confusion is, I read the theory saying that as...

Dear all, I am working on the recursive frequency sampling filter design. My confusion is, I read the theory saying that as it contains the poles.and also exactly pole zero cancellation occurs to give the stability. in case of fir filter using remez or any,


IIR filters

Started by w106pjs in Matlab DSP15 years ago

All What MATLAB function may be used once you have the SOS coefficient matrix using IIR filter design to filter the noisy signal data ?...

All What MATLAB function may be used once you have the SOS coefficient matrix using IIR filter design to filter the noisy signal data ? thanks Jack


lms adaptive notch filter(urgent!)

Started by ashwiny in Matlab DSP12 years ago 1 reply

Hi everyone,im doing a project regarding development of an adaptive notch filter to eliminate 50Hz noise from the biomedical signal.im a...

Hi everyone,im doing a project regarding development of an adaptive notch filter to eliminate 50Hz noise from the biomedical signal.im a newbie to matlab so im sorry if there is any term that I misunderstood..correct me please..here i found one `lms adaptive notch filter' code from the post.i tried to run it..i felt like there is something wrong with the spectrum of initial signal(output...


Filter Bank design for audio application

Started by Sanjay S in Matlab DSP15 years ago

> Can anyone please send me the MATLAB code of a 32 channel filter bank of > entire bandwidth range of ( 0 - 22050)Hz normally...

> Can anyone please send me the MATLAB code of a 32 channel filter bank of > entire bandwidth range of ( 0 - 22050)Hz normally employed in audio > codec such as MPEG-1. If you can send a non uniform filter > bank structure of say a 25 or 27 band, correspondingly matching


fft and frequency filtering

Started by ferhatdegirmenci in Matlab DSP15 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