## Frecuency response and Scilab

Started by in comp.dsp12 years ago

I updated the web: Problems and examples of frequency response (Bode diagram, Nyquist diagram, phase margin, gain margin, lead compensator,...

I updated the web: Problems and examples of frequency response (Bode diagram, Nyquist diagram, phase margin, gain margin, lead compensator, lag compensator, lag-lead, Nichols chart, static velocity constant error, resonant peak magnitude, resonant peak frequency, bandwidth) by Scilab (bode, syslin, logspace, nyquist, g_margin, p_margin, show_margins,repfreq, dbphi, tf2ss, chart, black, m_circle, ...

Started by in comp.dsp12 years ago

Hello again I want to thanks both of you, Rune and Mark for your answers. Now I understand why I couldn't get anywhere with this "unusual...

Hello again I want to thanks both of you, Rune and Mark for your answers. Now I understand why I couldn't get anywhere with this "unusual comparison". Thanks again! Victor

Started by in comp.dsp14 years ago 9 replies

Hi all, I'm looking for a good textbook that serves as an introduction to anti- aliasing filters, Nyquist frequency, sampling rates, SNR, low...

Hi all, I'm looking for a good textbook that serves as an introduction to anti- aliasing filters, Nyquist frequency, sampling rates, SNR, low pass filter design, etc. Can someone please suggest a reference? Thanks in advance, -weg

## data rate (please i need a help)

Started by in comp.dsp12 years ago

we have a band limited channel with W =4kHZ if S/N=10db i have used SHANNON law to find the capacity of chaneel =14b/sec the question ...

we have a band limited channel with W =4kHZ if S/N=10db i have used SHANNON law to find the capacity of chaneel =14b/sec the question is please can we send 2 bit/symbole through the chanel at NYquist sampling rate or not????

## alias in OFDM

Started by in comp.dsp10 years ago

Hi everyone, Got Stuck with fresh doubt. I saw a very old post...

Hi everyone, Got Stuck with fresh doubt. I saw a very old post in comp.dsp http://www.dsprelated.com/showmessage/58605/1.php ------------------------------------------------------------------------------------------------ ------- in that post, phil says "This isn't quite right. Keep in mind that frequencies that appear to be beyond the Nyquist frequency will end up wrap

## polyphase channelizer

Started by in comp.dsp15 years ago

hi all, I'm trying to build a polyphase channelizer in matlab using a prototype filter(sqrt nyquist) as my school project. Can anyone please...

hi all, I'm trying to build a polyphase channelizer in matlab using a prototype filter(sqrt nyquist) as my school project. Can anyone please explain this concept more precisely to me and what are the important things I should consider when implementing. Thank You. Riddhi

## Filter comparison

Started by in comp.dsp12 years ago

Hello everybody I need to know what are the parameters I have to look for in order to compare between a Nyquist L-th band digital filter...

Hello everybody I need to know what are the parameters I have to look for in order to compare between a Nyquist L-th band digital filter and a Raised Cosine digital filter. Thanks to verybody! Victor

## Best resampling approach for different types of data?

Started by in comp.dsp12 years ago 20 replies

Hi, I need to downsample a bunch of signals, all of which have very different properties (the Nyquist criteria will not be fulfilled after...

Hi, I need to downsample a bunch of signals, all of which have very different properties (the Nyquist criteria will not be fulfilled after the downsampling). My question is how to proceed in the best possible way. All processing is off-line but has to be fairly fast. Case 1: An analogue signal (continuous amplitude and time) has been sampled and needs to be downsampled. I have no problems here...

Started by in comp.dsp18 years ago 16 replies

Hi all, What is quadrature sampling?It says that sampling frequency be greater than signal BW.Does it not violate Nyquist criterion?What are...

Hi all, What is quadrature sampling?It says that sampling frequency be greater than signal BW.Does it not violate Nyquist criterion?What are its applications? Regards. Raghavendra

Started by in comp.dsp15 years ago 15 replies

Hi, I posted about "wavelet" sampling here http://tinyurl.com/efnh6 in a thread: "Nyquist didn't say that". Nothing of what I said does not...

Hi, I posted about "wavelet" sampling here http://tinyurl.com/efnh6 in a thread: "Nyquist didn't say that". Nothing of what I said does not have to be tied to wavelet terminology, thus I try not to use it in the following (to keep it general and perhaps more easily accessible). This is bit lengthy so if you're in a hurry then skip to the end of this post. Let there be a real function phi...

## Got it to work :-)

Started by in comp.dsp15 years ago

Hello all. I'm very happy to say my filter is working perfectly. What it looked like before was that I was aliasing input frequencies above...

Hello all. I'm very happy to say my filter is working perfectly. What it looked like before was that I was aliasing input frequencies above Fs/4 the decimating Nyquist. After much trial and error I think my problem was that 1. I didn't account for the filter gain - after filtering - the skirts then were heavily amplified. 2. I may have not added in correctly the previous MAC. (time for vers...

Started by in comp.dsp11 years ago 40 replies

I'm starting a new thread (from "Sampling: What Nyquist Didn't Say, and What to Do About It"), because the old one rapidly filled up with all...

I'm starting a new thread (from "Sampling: What Nyquist Didn't Say, and What to Do About It"), because the old one rapidly filled up with all sorts of interesting stuff that I didn't want to detract from. I've posted a new version. It uses Bitstream fonts for Roman -- used because it was mentioned, and because it was there. It's still a serif font which isn't optimum for monitor viewi...

## Re: Sampling: What Nyquist Didn't Say, and What to Do About It

Started by in comp.dsp11 years ago

I think that the mandatory upgrade is overrated. I am still using Acrobat 6.0 and often get a warning that the document I am opening is not...

I think that the mandatory upgrade is overrated. I am still using Acrobat 6.0 and often get a warning that the document I am opening is not compatible with the version of Acrobat I am using. But it is very seldom that I actually find a problem viewing a document. The only one that comes to mind are the data sheets from Silicon Blue. Some of those actually can not be viewed using

## System Identification

Started by in comp.dsp13 years ago 6 replies

When doing the AR analysis, sometimes the result has the negative stable real poles in Z domain. If we try to map those poles into S domain,...

When doing the AR analysis, sometimes the result has the negative stable real poles in Z domain. If we try to map those poles into S domain, they correspond to the complex conjugate pairs with the imm part of +/- Pi, i.e. above Nyquist. What should be the interpretation of this result? VLV

## Max/Min of continuous signal

Started by in comp.dsp7 years ago 14 replies

Group, I sample a bandlimited signal satisfying Nyquist. How can I get the maximum/minimum of the continious time signal from the samples, ...

Group, I sample a bandlimited signal satisfying Nyquist. How can I get the maximum/minimum of the continious time signal from the samples, i.e. upper/lower bounds or the dedicated value. Any pointers welcome. THX Cheers Detlef _____________________________ Posted through www.DSPRelated.com

## Sawtooth generation

Started by in comp.dsp16 years ago 1 reply

Hi, I want to set a few things clear in my head and was hoping you could help. Sawtooths have an infinite number of harmonics, so am I right in...

Hi, I want to set a few things clear in my head and was hoping you could help. Sawtooths have an infinite number of harmonics, so am I right in saying that a DAC can only represent harmonics with frequencies equal to or below the Nyquist limit? In other words, if I have a sampling rate of 1000Hz, and I wish to output a sawtooth with a fundamental frequency of 200Hz, then the best I could ho...

## Oversampling and the FFT

Started by in comp.dsp15 years ago 5 replies

Hello, I was recently working with a DSP engineer who was making an argument to me that if I didn't oversample (above Nyquist) that I would be...

Hello, I was recently working with a DSP engineer who was making an argument to me that if I didn't oversample (above Nyquist) that I would be "losing information," and I still fail to understand exactly what information I would be losing. The context of our particular application, is that we are dwelling on a signal for a fixed period of time (a design constraint), but we can sample at whatever ...

## Multiple random sampling

Started by in comp.dsp9 years ago 5 replies

Hi all, I've a question about sampling and reconstruction. There is a system, composed by "n" A/D converters, which have a very fast...

Hi all, I've a question about sampling and reconstruction. There is a system, composed by "n" A/D converters, which have a very fast sample-and-hold, but the conversion rate might be below Nyquist The converters run each on their own clock, that is they are completely asynchronous with each other, even more, their sampling frequency is, in principle, unknown. The input (analog) si...

Started by in comp.dsp12 years ago 112 replies

Hi all, Can non-uniform sampled signal be used to perfectly reconstruct the original continuous time signal? What is the Nyquist sampling...

Hi all, Can non-uniform sampled signal be used to perfectly reconstruct the original continuous time signal? What is the Nyquist sampling rate in the non-uniform case? Thanks a lot! -L

## fundamental question

Started by in comp.dsp15 years ago 10 replies

A very basic question: Take two properly sampled signals (more than nyquist). Now I mulitply the two sample streams. From a continous time...

A very basic question: Take two properly sampled signals (more than nyquist). Now I mulitply the two sample streams. From a continous time view point it is easy to see that the product could have frequencies for which the initial sampling rate wouldnt be enough. So in any DSP system is one not supposed to multiply two signals? Has this something to do with whether multiplication with a v...