Re : Ripple and Filter

Started by Vipperla Ravi Chander N Rao in Matlab DSP14 years ago

Hi Mob, When you look to design a filter, ideally you would want a brick wall type of filter. But then to design a filter with...

Hi Mob, When you look to design a filter, ideally you would want a brick wall type of filter. But then to design a filter with such a characteristic is physically not possible. So you try and design a filter whose curve would fit within the desired characteristics. That is you allow


how to transform from analog Bandpass filter ----->equivalent Lowpass filter

Started by taisahmad in Matlab DSP11 years ago

Transformation from analog Lowpass filter to Bandpass filter is obtained by following steps 1 - desing low pass filter having specifications of...

Transformation from analog Lowpass filter to Bandpass filter is obtained by following steps 1 - desing low pass filter having specifications of bandpass filter 2 - obtain transfer function of lowpass filter 3 - subsitute s' = [(s^2+wo^2)/s] into Lowpass Tansfer fn to obtain banspass Transfer fn. but how can we transform a BP filter to Lowpass filter in analog domain..... if anyone ha...


Re: RE: filter function in matlab for awgn

Started by Mandar Rahurkar in Matlab DSP14 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


filter

Started by reshma_jacob in Matlab DSP14 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


NEED TO DESIGN A LOW P ASS FILTER

Started by itsmedevi_86 in Matlab DSP10 years ago 1 reply

I need to design a low pass filter with cut-off frequency 150Hz.since my algorithm involves finding the difference between the energy of...

I need to design a low pass filter with cut-off frequency 150Hz.since my algorithm involves finding the difference between the energy of the signal before and after passing through the filter ,I need the filter to have very high efficiency. I found ellip - 4th order to have good performance.But i need a better one. Could anyone suggest me a better filter type. waiting for reply T...


filter applicaion

Started by Harsh Pradhan in Matlab DSP12 years ago 1 reply

i am trying to apply a filter to a image matrix x ,, x=imread('image.bmp);please can u tell me how to apply digital filer to the matrix x, ...

i am trying to apply a filter to a image matrix x ,, x=imread('image.bmp);please can u tell me how to apply digital filer to the matrix x, i can design filter using fdatool; but where does the desined filter is saved i do not know,, and how to use any filter on any input sequence i do not know. please help me in this thing


Fillter design

Started by nazia in Matlab DSP15 years ago

Hi guys Can anyone help me in design filter using Matlab with following specification Design an approximation to ideal Low pass...

Hi guys Can anyone help me in design filter using Matlab with following specification Design an approximation to ideal Low pass filter of bandwith = 100 Hz The input to the filter has energy in the range 0 250 HZ The filter is to have a linear Phase The filter is to have


gain scaling of comb filter

Started by egan_nc in Matlab DSP14 years ago

Hi everyone, I have a 3rd order CIC comb filter with decimation ratio of 16. The freq response of the filter shows a gain of 60...

Hi everyone, I have a 3rd order CIC comb filter with decimation ratio of 16. The freq response of the filter shows a gain of 60 dB. How do I scale the gain of this filter to 0 dB? Do I minus 1000 from each of the coefficients of the filter, Hz? One of the paper I read uses a po


change a dsp filter for varios sampling frequency

Started by emilly in Matlab DSP12 years ago 1 reply

Dear all i have a digital filter H(Z)=1/32*(1-z^-6)^2 /(1-z^-1)^2 with sampling rate being 200Hz, the filter has a rather loe cutoff...

Dear all i have a digital filter H(Z)=1/32*(1-z^-6)^2 /(1-z^-1)^2 with sampling rate being 200Hz, the filter has a rather loe cutoff frequency of fc=11 Hz and introduces a delay of 5 sample or 25ms.this filter provides an attenuation greater than 25dB at 60Hz,and effectively suppresses power-line interference,if present. i make this filter in MATLAB with command:


Kalman filter

Started by gatzos_barca in Matlab DSP9 years ago

Hello everyone!! Im struggling on a simple assignment. I have to filter specific data (which are in .xls format) using the "optimal" kalman...

Hello everyone!! Im struggling on a simple assignment. I have to filter specific data (which are in .xls format) using the "optimal" kalman filter in both ARMAX and ARX models. the struggle is on how to connect the data from the xls file to the filter... here i give u my kalman filter with the comments --------------------------------------------------------------------- % s = kalm...


FIR filter design

Started by "marinus.yates" in Matlab DSP10 years ago 1 reply

Hi I'm busy designing a decimation filter which takes 8 bits from a excessively oversampled ADC and decimates the signal. I need a...

Hi I'm busy designing a decimation filter which takes 8 bits from a excessively oversampled ADC and decimates the signal. I need a FIR filter to have an increased resolution. For example 8 bits into the filter but I need 13 bits out. If anyone could tell me how to make design that filter in matlab it would be of great help. Thank you.


IIR filter to 2d filter

Started by sadaf in Matlab DSP9 years ago

hi.can anyone tell me which command can i use to convert an IIR filter into 2D filter.i searched alot but couldn't find anything.please help me...

hi.can anyone tell me which command can i use to convert an IIR filter into 2D filter.i searched alot but couldn't find anything.please help me out


Adaptive Filter for ECG for Motion Artifact reduction

Started by Harry in Matlab DSP6 years ago

Hi, I'm currently working on a project to filter out the noise produced from movement in the ECG Signals with an adaptive Filter. I was wondering...

Hi, I'm currently working on a project to filter out the noise produced from movement in the ECG Signals with an adaptive Filter. I was wondering if someone here has had some experience with it, and if he or she could provide me with a sample in order to get an insight on the filter. =) I would really appreciate it! many thanks Harry


Relate lowpass filter cutoff frequency with real frequency (Hz) to filter from a sampled signal?

Started by in Matlab DSP8 years ago

Hello to all, My problem is the following: I have a signal x that was sampled with Fs = 8000 Hz and sampled 1000 samples. I want to...

Hello to all, My problem is the following: I have a signal x that was sampled with Fs = 8000 Hz and sampled 1000 samples. I want to filter the signal using a truncated version of an ideal discrete lowpass filter getting the filter coefficients b with the sinc function: k = -100:1:100 ; b = (1/Wc) sinc (Wc * k) ; I want to filter frequencies higher than 2500 Hz, I must somehow re...


question encountered during frequency response masking fir design

Started by fu_mengyao in Matlab DSP9 years ago 1 reply

hi everyone: I have all the component filter to make the overall filter, but could anyone tell me how to put them together in matlab and...

hi everyone: I have all the component filter to make the overall filter, but could anyone tell me how to put them together in matlab and plot the overall filter? I am stucked at two points:how to find a complementary filter of given fir,how to implement a adder in matlab. I am really really frastrated now,thanks to all kind reply. mengyao


strange result for filter design

Started by Moshe Malkin in Matlab DSP15 years ago 4 replies

Hello, The following code fails completely. Instead of producing the requested filter it returns the filter coefficients...

Hello, The following code fails completely. Instead of producing the requested filter it returns the filter coefficients as all zeros. Here's the code: % design narrowband filter f = [0.444 0.49 0.51 0.556 ]; a = [0 1 0]; dev = [0.0


Matched Filter

Started by xoticsmile in Matlab DSP13 years ago 2 replies

Hey Guys, how are you all doing? i have a project to do and im not sure if im doing it right .. the professor gave us a file...

Hey Guys, how are you all doing? i have a project to do and im not sure if im doing it right .. the professor gave us a file to filter by doing a matched filter .. i loaded the file .. then what i did for the matched filter is that i defined the impulse response


question on the usage of the m-file "filter"

Started by vijay_harikrishna in Matlab DSP13 years ago

Hi, Trying to use the M-file "filter" to filter out a high-freq signal from a composite signal. num,den gives the co-efficients...

Hi, Trying to use the M-file "filter" to filter out a high-freq signal from a composite signal. num,den gives the co-efficients of a Low-Pass filter with cut-off freq near 0.25*pi The filter works fine when the step_size variable is greater than 0.8 The


Re: NEED TO DESIGN A LOW P ASS FILTER

Started by wuqi...@yahoo.cn in Matlab DSP9 years ago

try fdatool in matlab. It is helpful. > > I need to design a low pass filter with cut-off frequency 150Hz.since > my algorithm involves...

try fdatool in matlab. It is helpful. > > I need to design a low pass filter with cut-off frequency 150Hz.since > my algorithm involves finding the difference between the energy of the > signal before and after passing through the filter ,I need the filter > to have very high efficiency. > > I found ellip - 4th order to have good performance.But i need a better > one. > Could anyone suggest me


Compensation filter

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

Dear all, I'm Andrea and this is my first post on DSPRelated. I have a trouble that I can't solve. I have a generic system whose output,...

Dear all, I'm Andrea and this is my first post on DSPRelated. I have a trouble that I can't solve. I have a generic system whose output, in the frequency domain, has a module proportional to the fourth power of angular frequency [ |.| proportional to w.^4 ]. I have to build a FIR filter that compensates this phenomena. So the filter is a sort of lowpass filter decaying with an inverse fou...