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Discussion Groups > Z Transform


Comp.dsp is a worldwide Usenet news group that is used to discuss various aspects of digital signal processing.

We found 298 threads matching ""z transform" "z-transform""

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The most relevant threads are listed first

Re: uniform filter bank implementation.
0

Ema - 2003-07-02 18:11:00
Hi Craig "Craig" ha scritto nel messaggio news:82396605.0307021238.443bbac@posting.google.com... > I would take some prototype low pass, or band pass filter H, and > seperate it into odd and even rows, then for all the H_odd you would > multply those rows by > -1 (this is same thing...Re: uniform filter bank implementation.

Re: Time-Limited Functions Represented as Periodic
0

Fred Marshall - 2003-07-11 12:28:00
"Clay S. Turner" wrote in message news:srzPa.2$Y_1.1@fe04.atl2.webusenet.com... > > "Fred Marshall" wrote in message > news:JBjPa.2522$Jk5.1647120@feed2.centurytel.net... > > We had a long discussion about time-limited functions, spectral > > representation, etc. > > > > I...Re: Time-Limited Functions Represented as Periodic

Re: DFT VS DTFT
0

Stan Pawlukiewicz - 2003-07-22 13:23:00
Fred Marshall wrote: > "Tom" wrote in message > news:slrnbho1p5.aeh.T.Otermans_REMOVE_THIS@noritake.basement... > > > praveen wrote: > > > > > Hello, > > > > > > I wanted to know the difference between discrete fourier transform and > > > discrete time fourier transform. > > > ...Re: DFT VS DTFT

Looking for old TRW app note "Intro to the Z Transform".
0

Tom - 2003-08-02 15:56:00
Hi, Years ago I obtained a really good explanation ofhe Z Transform called "introduction to the Z transform and its derivation" by Karwoski. This was a TRW app note. I have since lost my copy and was amazed to find that I could not find it on the internet. That division of TRW that was respon...Looking for old TRW app note

Re: transfer function confusion and MATLAB
0

Parlous - 2003-08-14 14:41:00
I tried taking a signal of 1102 samples, 44.1kHz, 16bit, mono containing a fundamental = 83.2 Hz harmonic tone and applied the function as follows in matlab: s = wavread(...) hl = lagrange( 3, 0.2 ) nl = [zeros(530,1);1] yfd = filter( hl, 1, s ) ynd = filter( nl, 1, s ) y = 1 - ynd.*yfd ...Re: transfer function confusion and MATLAB

Confusion with magnitude plot of a freg response of a filter, plz help
-6

2005-11-04 15:00:00
Dear members: Plz tell me what is the point I am wrong. It is my exam. I have to plot the magnitude of the freq response a Low Pass filter: y[n]=1/3*(x[n]+x[n-1]+x[n-2]); I used Z transform and found Y(z)/X(z)=H(z)=1/3*(z^2+z+1)/z^2. So there are two zeros at z1=-1/2 +sqrt(3)/2 a...Confusion with magnitude plot of a freg response of a filter, plz help

windowing DFT vs FFT (newbie)
0

Thomas Magma - 2003-08-28 16:44:00
Hello, I wrote a program in Java that does a DFT on raw 8bit samples stored in memory from a RF ADC (Post processing). This allows me to easily adjust the span (zoom) when I'm viewing the spectrum. Works great, but slow as hell. So I'm now trying an FFT with a Chirp Z-Transform so I can zoom i...windowing DFT vs FFT (newbie)

Z-Transform - ROC
0

Murty - 2003-08-29 04:30:00
Hi friends! I got a basic doubt in the theoritical dsp. Hope some one can help me. My actual question is: Consider a sequence x(n) whose z-transform is X(z) and ROC is characterized by Rx. Consider another sequence y(n) with z-transform Y(z) and ROC Ry. Now suppose that Rx and Ry...Z-Transform - ROC

S-Parameters, Z-Transforms and Stability.
0

Lord Labakudas - 2003-09-25 17:35:00
Hello DSP folks, This question has been bothering me for a long time since I took my Microwave Engineering course: Suppose we have a linear system H(z) we can easily find its poles and zeros and perform stability analyis of the system. Does such a thing exist for general network analysis us...S-Parameters, Z-Transforms and Stability.

Re: Math versus signal processing; terminology differences?
0

Bernhard Holzmayer - 2003-10-23 08:49:00
Liz wrote: > As a signal-processing person, I am trying to wade through some > heavy-duty math papers and having a problem. > > Suppose that you have a signal-processing network that is > represented by a transfer function (either Laplace or Z, doesn't > matter right now). Suppose tha...Re: Math versus signal processing; terminology differences?

Re: Minimum Phase Impulse Response
0

Rune Allnor - 2003-10-31 10:33:00
"Matt Timmermans" wrote in message news: ... > Again, I have no rational polynomials. Actually, there may be a chance that you do. The Z transform of a FIR filter *is* a rational polynomial, though with only a numerator and no denominator. Rune ...Re: Minimum Phase Impulse Response

Re: Oppenheim & Schafer
0

Greg Berchin - 2003-11-12 17:19:00
On 12 Nov 2003 13:58:47 -0800, allnor@tele.ntnu.no (Rune Allnor) wrote: > > Does anyone know why the two different editions are available? > > And what differnces there may be betwen the two? According to one > > customer review at amazon there seems to be quite substantial > > differences ...Re: Oppenheim & Schafer

Re: using z transform for a discrete time filter
0

zyd - 2006-05-15 20:02:00
thanks for your responses. I like the pid controller thing, the "PID without a PhD" is quite straightforward and i think it could be of use for my cause ...Re: using z transform for a discrete time filter

Re: Vernier FFT
0

Steven G. Johnson - 2003-11-25 13:35:00
Rune Allnor wrote: > Does anyone know how to compute the DFT coefficients efficiently > in a narrow frequency band (few but more than one bins)? I guess > such an algorithm would be a cousin of the Goertzel algorithm? Tom Loredo wrote: > FractionalFFT: > > http://citeseer.nj.nec.c...Re: Vernier FFT

Question about the z-transform for ARMA modelling
0

Martin - 2003-11-26 04:44:00
Hello! I have some questions about the z-transform and what to use it for in for example ARMA-filters. I know it is used to find poles and zeros, but what else? Consider an ARMA filter: y(t)+a1*y(t-1)+a2*y(t-2)=x(t)+c1*x(t-1)+c2*x(t-2) After z-tranformation it can be written: Y(z)=H(z)...Question about the z-transform for ARMA modelling

Re: Why minimising in the mean-error sense.
-2

Rune Allnor - 2003-12-06 07:30:00
Bob Cain wrote in message news: ... > Wouldn't it be > correct to believe that if the result of the calculation is > a least mean square approximation to the component's actual > impulse response having a particular length and delay that > the phase information would be optimally prese...Re: Why minimising in the mean-error sense.

Re: numerical differentiation using FFT
0

Rune Allnor - 2003-12-10 19:17:00
MCTimes@21cn.com (Hakuna M. C.) wrote in message news: ... > Hi all, > I am using a frequency operator to act as a differentiator like > > i*w d/dt > here w is the frequency defined in fourier space. Almost. What you state is valid for continuous functions. With matlab (and a...Re: numerical differentiation using FFT

Total phase of a sum of complex numbers
0

Rune Allnor - 2003-12-17 23:18:00
Hi all. I am working with this problem that involves modelling the total phase of a signal, i.e the phase can take on any value and is not restricted to the interval [0, 2pi> . Part of the analysis involves a reflection sequence on the form Q r(n) = sum A_q*d(n-m_q) ...Total phase of a sum of complex numbers

Re: Anthropomorphisms and the inherent periodicity of the DFT
0

Eric Jacobsen - 2006-01-11 19:17:00
On Wed, 11 Jan 2006 16:44:48 -0500, Stan Pawlukiewicz wrote: > robert bristow-johnson wrote: > > (big snip) > > s" that the data > > passed to it is one period of a discrete, infinite, and periodic > > sequence of numbers that has period length of N. > > > > i fail to see this ...Re: Anthropomorphisms and the inherent periodicity of the DFT

Re: FFT for sequences of arbitrary lengths
0

Rick Lyons - 2006-03-10 11:29:00
On 10 Mar 2006 05:22:41 -0800, "Srini" wrote: > When I try to apply fft to sequence lengths which are not powers of 2 - > I decided to extend the data with zeros to the next higher power of 2 > and then apply fft. Problem is the transform has more coefficients than > the input. We cannot ju...Re: FFT for sequences of arbitrary lengths

Re: Anthropomorphisms and the inherent periodicity of the DFT
0

Fred Marshall - 2006-01-11 18:04:00
"Stan Pawlukiewicz" wrote in message news:dq3u8h$nan$1@newslocal.mitre.org... > robert bristow-johnson wrote: > > (big snip) > > s" that the data > > passed to it is one period of a discrete, infinite, and periodic > > sequence of numbers that has period length of N. > > > > ...Re: Anthropomorphisms and the inherent periodicity of the DFT

Re: J.17 s -> z conversion
0

Robin Clark - 2004-01-16 19:42:00
On Fri, 16 Jan 2004 02:33:36 +0000, Anand wrote: > I am trying to implement J.17 de-emphasis cure in a 32 bit processor. > I have converted J.17 S-domain transfer function using Bilinear of > MATLAB. The maltlab plot of manitude responce matches with the table > biven in the std. But when ...Re: J.17 s -> z  conversion

Re: Gain of an IIR Filter
0

robert bristow-johnson - 2007-09-03 15:54:00
On Sep 3, 11:21 am, Andor wrote: > Randy Yates wrote: > > Randy Yates writes: > > > In general, the frequency response of a digital filter (IIR or FIR) > > > is determined by evaluating H(z) at z = e^{j*2*pi*f*Ts}, where Ts is > > > the sample period and f is the frequency at whi...Re: Gain of an IIR Filter

Re: Audio application problem
0

Jon Harris - 2004-01-19 13:48:00
"Jerry Avins" wrote in message news:40096010$0$6092$61fed72c@news.rcn.com... > PROVENTEK MINDCRAFT AB wrote: > > > Hi folks, > > > > I'm working with an dsp audio application and I desperately > > need an algorithm for tone control. > > > > The filter is described in my spe...Re: Audio application problem

Re: Yet another article claiming Goertzel k must be integer
0

Rick Lyons - 2004-01-21 06:55:00
On Tue, 20 Jan 2004 08:51:40 -0600, "Shawn Steenhagen" wrote: > Guys, Hi Shawn, > I didn't see the article in question, but I believe if they are talking > about a "sliding Goertzel", then k must be an integer, otherwise you don't > get a good zero/pole cancellation and the filter des...Re: Yet another article claiming Goertzel k must be integer

Re: Fast response filter?
0

Fred Marshall - 2004-01-23 14:11:00
"Luiz Carlos" wrote in message news:3fd8f66b.0401230509.38272b12@posting.google.com... > Martin, > > Somebody here said: sin(x)/x. (Now obvious!) > So, I'll ask for something a little bit different: > I want an example for a causal signal that has bandlimited spectrum. Luiz Carlos...Re: Fast response filter?

Re: Need help with lowpass filter
0

Fred Marshall - 2004-01-29 18:20:00
"Lee Southern" wrote in message news:457ffbd.0401291253.4501b82@posting.google.com... > I am a complete newbie to DSP... > > I have a requirement to implement (in software) a "first-order lowpass > filter with a cut-off frequency of 1.6Hz and a gain of 0dB". No > mention is made of ...Re: Need help with lowpass filter

Re: Complexity of not 2^n FFT
0

Matt Timmermans - 2004-02-03 09:22:00
"Ray Andraka" wrote in message news:401FA657.2575343D@andraka.com... > > what is the complexity of FFT computed on block lenght other then power > > of 2 ? > > Is it still NlogN ? > > roughly, but it depends on the radix Even if you had a prime-length FFT, you could do it in O(...Re: Complexity of not 2^n FFT

ESP article Chirp Z transform questions/problems
0

bo - 2004-02-12 08:34:00
I read the article and downloaded the code (below). Problem is every compiler I have tried (CodeComposer, gnu, VisualC++) has problems with the notations: double[][] xxxx (I indicate occurrences in the code below with ' 256) && ((N+M) 128) && ((N+M) 64 ) && ((N+M) 32 ) && ((N+M) 1...ESP article Chirp Z transform questions/problems

Re: equivalence between Z-transform and Laplace-Transform
0

Tim Wescott - 2004-11-04 10:07:00
AG wrote: > Hi Tim, -- snip -- > > > The term "damping ratio" is much more slippery when you're talking > > about discrete-time systems. Assuming that I'm not messing up the > > math, if you find the pole locations of your transfer function, z_0 = > > e^{jw + q) then the "damping...Re: equivalence between Z-transform and Laplace-Transform

Re: 1D Discrete wavelet transform(DWT)
-6

Jani Huhtanen - 2005-11-22 10:25:00
Umutesi Faith wrote: > > More info: http://www.math.hmc.edu/faculty/ward/wavelets/pdfs/m185l2.pdf > > I have been at this link, well i guess the calculations of these > coefficients are not as easy as i thought. It shows quite simple way of > getting the scaling and wavelet coefficients in...Re: 1D Discrete wavelet transform(DWT)

what is the z-transform of sinc function?
0

Joenyim Kim - 2004-02-28 14:35:00
Can anybody tell me what is the z-transform of "sinc" function and what is its region of convergence? Thanks a lot, -Joenyim ...what is the z-transform of sinc function?

[Q] How can the chirp-z transform be used in resampling?
0

One Usenet Poster - 2004-03-11 22:23:00
DSP Gurus: I'm familiar with the classic interpolate-filter-decimate approach to multirate DSP. I've heard that the chirp-z transform can be used to resample a signal also. Can anyone provide additional information or references (other than Google search results)? Thanks, OUP ...[Q] How can the chirp-z transform be used in resampling?

Minimum phase filter design using cepstrum methods?
0

Ronald H. Nicholson Jr. - 2004-03-17 16:53:00
I've run across a few web pages describing how to convert an arbitrary FIR filter to a minimum phase variant by the use of cepstral methods: e.g. > wn = [ones(1,m); 2*ones((n+odd)/2-1,m) ; ones(1-rem(n,2),m); > zeros((n+od d)/2-1,m)]; > y = real(ifft(exp(fft(wn.*real(ifft(log(abs(fft(x...Minimum phase filter design using cepstrum methods?

Re: pole-zero plot with zeros |a|
0

Randy Yates - 2004-03-31 17:39:00
"Philip Newman" writes: > [...] > The pole zero plot of the FIR equaliser shows that there are 7 poles at the > centre, and 7 zeros, each at magnitude of |a| where a = b1/b0. > > Why is this? It depends on what "this" is. Do you mean "Why are there 7 poles at the centre"? If so,...Re: pole-zero plot with zeros |a|

Re: wavelets - vanishing moments - what are they?
0

Jani Huhtanen - 2005-11-20 08:25:00
Ben wrote: > In article , Ben wrote: > > > Hello, > > > > Can anyone give a _very_ simple explanation / definition of what > > vanishing moments are in the field of wavelets please? I'm reading > > Hubbard's the World According to Wavelets and the book keeps using the > > ph...Re: wavelets - vanishing moments - what are they?

Re: phase reconstruction from bispectrum
0

Rune Allnor - 2007-10-25 01:35:00
On 23 Okt, 17:08, Todd wrote: > This seems straight forward enough, but I'm stuck. Who's done work > with the bispectrum? I have not, but I did look into the complex cepstrum a few years back and got into serious trouble with phase. When dealing with spectra and phase, you end up wi...Re: phase reconstruction from bispectrum

Simple z-transform question
0

?ine Canby - 2005-02-07 12:29:00
Hi, The transfer function for a lossy integrater is H(z) = z/(z-c) the magnitude spectrum is given by M(f) = |z|/|z-c| so lets say I have a c value of 0.8, how do I plot M(f)? I simply tried plugging in values for z ni the range of 0 to 1, but this does not give me what I would ex...Simple z-transform question

Re: FFT of a known periodic signal of arbitrary length with a radix-2 algorithm
0

lord trousers - 2005-11-04 17:54:00
Gordon Sande wrote: > On 2005-11-03 01:49:18 -0400, "lord trousers" said: > > > I've browsed a bit, so hopefully I've got all my information in order. > > I haven't been able to find an answer for this specific problem. > > > > It's for image processing. I'm simplifying 2D regions...Re: FFT of a known periodic signal of arbitrary length with a radix-2 algorithm

Re: How to judge if a filter "filters" anything against a sequence
0

Tim Wescott - 2005-12-07 12:31:00
merlin.jiang1978@gmail.com wrote: > Hello, > > I am thinking about a question about how to figure out whether a linear > filter really filters out anything against a particular sequence (or > any sequence). Here I don't want to compute w/ convolution, but I don't > know if it is possi...Re: How to judge if a filter
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