Re : Ripple and Filter

Started by Vipperla Ravi Chander N Rao in Matlab DSP16 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


NEED TO DESIGN A LOW P ASS FILTER

Started by itsmedevi_86 in Matlab DSP12 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...


Fillter design

Started by nazia in Matlab DSP17 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


IIR filter to 2d filter

Started by sadaf in Matlab DSP11 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


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

Started by taisahmad in Matlab DSP13 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 DSP16 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 DSP16 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


Kalman filter

Started by gatzos_barca in Matlab DSP12 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 DSP12 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.


gain scaling of comb filter

Started by egan_nc in Matlab DSP17 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 DSP14 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:


filter applicaion

Started by Harsh Pradhan in Matlab DSP14 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


Adaptive Filter for ECG for Motion Artifact reduction

Started by Harry in Matlab DSP8 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


question encountered during frequency response masking fir design

Started by fu_mengyao in Matlab DSP11 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


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

Started by in Matlab DSP11 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...


about cic filter problem

Started by liux...@yahoo.cn in Matlab DSP11 years ago 4 replies

Hello all, In the book of "understanding of digital signal processing", it is said that cic filter has a inherent problem which is cic filter...

Hello all, In the book of "understanding of digital signal processing", it is said that cic filter has a inherent problem which is cic filter can not remove the outband imgage clearly and the image will be folded into the real signal when decimation especially when stage of cic filter is very small. But there is an integrater ahead of decimation. Is the integrater a good low pass filter enoug...


FIR or IIR?

Started by "kian.zarrin" in Matlab DSP12 years ago 1 reply

Hallow, please help me about choosing FIR or IIR filters I have a DSP/FPGA system to process signal and I want to design a filter to filter my...

Hallow, please help me about choosing FIR or IIR filters I have a DSP/FPGA system to process signal and I want to design a filter to filter my input signal. I need to know which one is better for me, FIR filter or IIR filter. For my application I need to meet all the requirements below: 1) Low ripple 2) Linear Phase response 4) Sharpness: to block noise 5) Complexity (inherent group pha...


Re: NEED TO DESIGN A LOW P ASS FILTER

Started by wuqi...@yahoo.cn in Matlab DSP11 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


Re: gain scaling of comb filter

Started by wuqi...@yahoo.cn in Matlab DSP11 years ago

Hi, have you get your answer? I am a beginner of this field. I am in a project that have to use the CIC filter. The gain of the filter also puzzle...

Hi, have you get your answer? I am a beginner of this field. I am in a project that have to use the CIC filter. The gain of the filter also puzzle me a lot. In matlab, I could just divide by 1/gain(CIC) before or after the CIC to scale the gain of this filter to 0 dB. But I don't know how to implement it in verilog or in the hardware. Also I don't know whether is it necessary. > > > > H


strange result for filter design

Started by Moshe Malkin in Matlab DSP17 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