Halfband FIR design with alternating zeros

Started by I. R. Khan in comp.dsp14 years ago 13 replies

I tried matlab 'remez.m' and several online applets to design equiripple halfband lowpass FIR filters. All of them give the filter...

I tried matlab 'remez.m' and several online applets to design equiripple halfband lowpass FIR filters. All of them give the filter coeffiecients, which are all non-zero. I was expecting that every third coefficient in halfband designs should be zero. Is this correct? If yes, then is there some online free software that gives such results for equiripple filters. I have found such designs ...


Convert absorption coefficients into magnitude or frequency response

Started by Zif in comp.dsp13 years ago 2 replies

I'm trying to design an fir filter based on absorption coefficients given at various frequencies. Aspects like the angle of reflection don't need...

I'm trying to design an fir filter based on absorption coefficients given at various frequencies. Aspects like the angle of reflection don't need to be taken into account and I've been looking at using matlab functions like yulewalk, remez, and invfreqz for the task. Each of these functions however require input types like the complex frequency response or the magnitude response. How do I convert ...


21061 ez-kit bandpass demo coefficients ???

Started by Bergen in comp.dsp12 years ago

Hello again. For few weeks I'm trying to create my own FIR coefficients for 21061 Ez-Kit Lite bandpass demo, using Matlab ( fir1, remez,...

Hello again. For few weeks I'm trying to create my own FIR coefficients for 21061 Ez-Kit Lite bandpass demo, using Matlab ( fir1, remez, sptool), without any results. I written for help on many net forums. Nobody knows why my coeffs doesn't work. I guess nobody even tried to made FIR for this EZ-Kite. It's using for its bandpass demo strange coefficients and it works: http://wi...


how to apply 2D FIR filter to an image using MATLAB?

Started by fulltime in comp.dsp12 years ago 2 replies

Hi all, I have used remez function to design a 1D FIR filter and converted it to a 2D FIR filter using ftrans2. However, wat commands in matlab...

Hi all, I have used remez function to design a 1D FIR filter and converted it to a 2D FIR filter using ftrans2. However, wat commands in matlab can i use to apply this 2D FIR filter to my image? thks..


FIR filter canonic structure

Started by faz in comp.dsp11 years ago 12 replies

Hai all, I am searching for a tool other than FDA matlab to give me FIR low pass filter coefficients for canonic structure with any one...

Hai all, I am searching for a tool other than FDA matlab to give me FIR low pass filter coefficients for canonic structure with any one method like window,remez algo etc...I already tried scopeFIR,WinDFplus,FIR tool..pls suggest the dsp tool where i can get the filter coefficients??pls specify links if any.. regards, faz


sample rate change of a narrow band signal

Started by fahim in comp.dsp12 years ago 2 replies

I want to change sampling rate of a narrow band signal by a fractional factor of 15/13. The original signal is -60dB or lower after f=0.08...

I want to change sampling rate of a narrow band signal by a fractional factor of 15/13. The original signal is -60dB or lower after f=0.08 (1 corresponds to half the sampling rate). I use matlab upfirdn function and design the anti-imaging/anti-aliasing filter using remez. The problem is that i get small droop in the passband no matter how sharp a filter i have got. I know this sounds a bit vague ...


how to design window based half band fir filters

Started by bharat pathak in comp.dsp11 years ago 4 replies

Hello, So far i have been designing half band filters using remez function. Is it possible to design half band fir filter using window (like...

Hello, So far i have been designing half band filters using remez function. Is it possible to design half band fir filter using window (like hamming, hanning, kaiser, blackmanharris etc) based design method? Regards Bharat Pathak Arithos Designs www.arithos.com


Hilbert transform & analytic signals

Started by Rick Lyons in comp.dsp16 years ago 15 replies

Hi Guys, I've been modeling (with MATLAB) the Hilbert transform for use in generating the analytic signal (a complex signal)...

Hi Guys, I've been modeling (with MATLAB) the Hilbert transform for use in generating the analytic signal (a complex signal) corresponding to a real signal x(n). That is, I'm computing a complex signal whose real part is x(n) and whose imaginary part is the Hilbert transform of x(n). I can use MATLAB's remez() command specifying 'Hilbert' to get an FIR Hilbert filter that will g...


FIR filter design (false advertizing?)

Started by Paul Mennen in comp.dsp15 years ago 18 replies

Trying to design an FIR Low pass filter. As a simple example, consider: > > edge = [0 .3 .7 1]; > > weight = [100 1]; > > ...

Trying to design an FIR Low pass filter. As a simple example, consider: > > edge = [0 .3 .7 1]; > > weight = [100 1]; > > 1000*remez(7,edge,[1 1 0 0],weight) ans= 32.2690 -109.2208 81.9170 495.0689 495.0689 81.9170 -109.2208 32.2690 The resulting filter has a pass band ripple of +/- .013dB and a stop band of -16.84dB. (The pass band is from DC to .3 and the stop band is from .7 to 1 where