Hi all, I've got an analyic signal for which I'm designing an IIR filter with purely real valued coefficients. I'd like to look at the...

Hi all, I've got an analyic signal for which I'm designing an IIR filter with purely real valued coefficients. I'd like to look at the impulse response of this filter, but since the normal impulse is purely real and the coefficients are all real, the impulse response is also purely real. In order to get a complex impulse response, I need a complex impulse. Is this: .... 0 0 0...

Hello experties, I'm using Durbin-Levinson algorithm to calculate the inverse impulse response of a given impulse response h in the time...

Hello experties, I'm using Durbin-Levinson algorithm to calculate the inverse impulse response of a given impulse response h in the time domaine. The algorithm requires three input parameters: - Impulse response h - The delay time of the inverse impulse response of h - The length of the inverse impulse response Is there any methode to estimate The delay time and the length of the inverse i...

Sirs, In many of the textbooks, the impulse response of a filter is given as a SINC function. If we ignore the non-causal nature of the impulse...

Sirs, In many of the textbooks, the impulse response of a filter is given as a SINC function. If we ignore the non-causal nature of the impulse response, still the impulse response extends, in theory at least, for infinite duration. My question is, since the impulse response is infinite in duration, does that mean that this represents IIR type of structure? Thanks, manish

In his book, "A Course in Digital Signal Processing", Porat states that it is a common misconception is that every Linear Time-Invariant system...

In his book, "A Course in Digital Signal Processing", Porat states that it is a common misconception is that every Linear Time-Invariant system has an impulse response. He then quotes an example from Kailath's book, "Linear Systems". The crux of the argument is to define the class of inputs such that the impulse does not belong to it and then claim the system has no impulse response. This ...

Hello, Books describing LTI systems often make reference to "real valued impulse response". I am little confused here ... what type of...

Hello, Books describing LTI systems often make reference to "real valued impulse response". I am little confused here ... what type of practical systems would have "complex values impulse response" vis-a-vis "real valued impulse response" Thank you _____________________________ Posted through www.DSPRelated.com

Hi, I have measured the impulse response of a plant using an MLS sequence. I now have a nice 1.3ms (130k points!) long impulse response, for...

Hi, I have measured the impulse response of a plant using an MLS sequence. I now have a nice 1.3ms (130k points!) long impulse response, for which I can take the FFT and see the frequency response. The impulse response vanishes to almost zero after about 1024 samples. In fact, if I simply truncate it to 1024 samples, I get an identical frequency response. However, if I start truncating to les...

Hello forum, if a time-invariant (zero memory) nonlinear filter is fed with a delta impulse, it will output a certain output. That output...

Hello forum, if a time-invariant (zero memory) nonlinear filter is fed with a delta impulse, it will output a certain output. That output will be the same no matter when the impulse is applied due to time invariance.... Superposition (convolution) is not valid for nonlinear system. Is there however some generalized impulse response concept for nonlinear systems? After all, nonlinear...

hi there, i was going through a paper on using hilbert transform for edge detection in image processing.It said over there that the hilbert...

hi there, i was going through a paper on using hilbert transform for edge detection in image processing.It said over there that the hilbert transform works better than differentiation for edge detection as it has longer impulse response which helps reduce the effect of noise.I am new to the subject and dont understand what exactly does a longer impulse response mean.??.and how does the impulse res...

Hello all, I was wondering what is the benefit of a SYMMETRIC impulse response for a filter? Lets assume that we have an FIR filter. Does a...

Hello all, I was wondering what is the benefit of a SYMMETRIC impulse response for a filter? Lets assume that we have an FIR filter. Does a symmteric impulse response necessarily produce a linear phase response (and thus a constant group delay) over the frequency band of interest? Are there any other benefits from a filter with a symmetric impulse response? Thanks so much for your replies! ...

Hi, I wonder if there are methods to calculate the coefficients of a recursive iir filter, for a given time-domain impulse response. (Of...

Hi, I wonder if there are methods to calculate the coefficients of a recursive iir filter, for a given time-domain impulse response. (Of course I can not give an infinite impulse response, but if I want a filter which follows approximately the given impulse response of maybe 16 samples or so - it can have an additional 'tail' afterwards) I wonder if this might be usefull for the implem...

I have done an impulse response of an IIR filter. The impulse response of the filter does not return to zero but stops at a level close to zero...

I have done an impulse response of an IIR filter. The impulse response of the filter does not return to zero but stops at a level close to zero (I think it?s because limitations in fraction bits). The filter is implemented in fixed point arithmetic?s. And when I make an FFT of the impulse response de 0 Hz gain is not 0 dB as I would like it to be. But when I run a step response I...

OK, I'm going to really stick my naive neck out on this one... Why isn't the impulse response of a perfect LPF a flat line (i.e.,...

OK, I'm going to really stick my naive neck out on this one... Why isn't the impulse response of a perfect LPF a flat line (i.e., zero)? For example, an infinitely large mass (the filter) hit by an infinitely small particle (the impulse) would not move at all because of its inertia (acceleration goes to zero as masses go to +/-infinity). So why is the impulse response of an infinitely l...

I am designing low pass IIR filter using Impulse Invariance method. I've got transfer function H(z) which depends on impulse sample period...

I am designing low pass IIR filter using Impulse Invariance method. I've got transfer function H(z) which depends on impulse sample period T. I was asked to choose an appropriate impulse sample period T for H(z) such that the input signal x(t) = 5 cos(2pi(8000)t ? pi/3) ? 4 cos(2pi(40000)t + pi/2) sampled at a rate of Fs = 100 kHz has only the 8000 Hz sinusoid in the passband. I do...

Hi! I want to get FRF of IIR Filter from Impulse Response. So, I got FRF using two method. One is FREQZ, another is FFT of impulse response....

Hi! I want to get FRF of IIR Filter from Impulse Response. So, I got FRF using two method. One is FREQZ, another is FFT of impulse response. But two results are different. Why? My source code are below : clear all close all clc fs=2048; % Sampling Frequency N=65536; % Buffer Size t=[0:N-1]'./fs; % Time f = [0:N/2]'*fs/N; % Frequency x = zeros(N,1); % Impulse Input...

> Subject: Re: Complex version of an impulse > From: Jerry Avins jya@ieee.org > Date: 4/16/2004 11:46 AM Eastern Daylight Time > Message-id: ...

> Subject: Re: Complex version of an impulse > From: Jerry Avins jya@ieee.org > Date: 4/16/2004 11:46 AM Eastern Daylight Time > Message-id: > > robert bristow-johnson wrote: > > > In article da4d20d8.0404152109.7ed6b813@posting.google.com, Impulse at > > impulse@e.coolworks.com wrote on 04/16/2004 01:09: > > > > > > > Hi all, > > > > > > I've got an analyic

I am reading about CIC filters used for an Sigma Delta converter. In that the author mentions that - For a 2nd order filter, decimating by N,...

I am reading about CIC filters used for an Sigma Delta converter. In that the author mentions that - For a 2nd order filter, decimating by N, the length of the impulse response is 2N+1 - For a 3rd order filter, decimating by N, the length of the impulse response is 3N. - For a 4th order filter, decimating by N, the length of the impulse response is 4N. The filter has to operate for a ...

I am reading about CIC filters used for an Sigma Delta converter. In that the author mentions that - For a 2nd order filter, decimating by N,...

I am reading about CIC filters used for an Sigma Delta converter. In that the author mentions that - For a 2nd order filter, decimating by N, the length of the impulse response is 2N+1 - For a 3rd order filter, decimating by N, the length of the impulse response is 3N. - For a 4th order filter, decimating by N, the length of the impulse response is 4N. The filter has to operate for a ...

Hi, i hav just studied the impulse invariance method & bilinear transform. In Impulse Invariance there is "many to one mapping" and hence...

Hi, i hav just studied the impulse invariance method & bilinear transform. In Impulse Invariance there is "many to one mapping" and hence aliasing takes place. while in Bilinear Transform there is "one to one mapping" and hence no aliasing. Actually what is the "one to one mapping" & "many to one mapping"? how it is related to aliasing?

Hello all, I'm reviewing some DSP fundamentals and can't seem to intuitively understand the Poisson Summation Formula. The results of this...

Hello all, I'm reviewing some DSP fundamentals and can't seem to intuitively understand the Poisson Summation Formula. The results of this formula assist in deriving the Shannon Sampling Theorem. Put simply, the fourier transform of an 'impulse train' in time equals a 'impulse train' in frequency. Where I struggle is I try to simply an impulse (or pulse) 'train' down to say one sample. ...

Chris Bore wrote: > But the frequency spectrum exists over all time, not just during the > impulse. > > So I don't think this can be used...

Chris Bore wrote: > But the frequency spectrum exists over all time, not just during the > impulse. > > So I don't think this can be used to explain why the lightning > disrupts radio for a short time. Chris, The lightning isn't really an impulse. Some have durations of milliseconds, few less than tens of microseconds. That's more than enough to localize the interference in time.