## Sampling Bandpass signals

Started by in Matlab DSP20 years ago 2 replies

Hi everybody, I have some question about sampling bandpass signals. There is sampling theorem for this kind of signals, the...

Hi everybody, I have some question about sampling bandpass signals. There is sampling theorem for this kind of signals, the sampling rate must be two times the frecuency of the max information component instead of the max frecuency afther modulation. If you play with the

## Normalised Sampling

Started by in Matlab DSP15 years ago 2 replies

Hi all, I know this is a Matlab discussion group, but I would like to ask regarding DSP in Excel? Can anyone please enlighten me, what does...

Hi all, I know this is a Matlab discussion group, but I would like to ask regarding DSP in Excel? Can anyone please enlighten me, what does it mean by Normalised Sampling? How many type of sampling are there? How to perform a non-normalised sampling in excel? I have been to many excel forum but majority of them are excel's expert, not DSP's expert. Thanks in advance:)

## Changing sampling frequency

Started by in Matlab DSP11 years ago 3 replies

I have a digital filter that is designed for 1kHz sampling frequency. Everything else remaining the same, I want that filter to work for 4...

I have a digital filter that is designed for 1kHz sampling frequency. Everything else remaining the same, I want that filter to work for 4 kHz sampling frequency. What do I need to do? I am not a filter guy and my background is power system. That is why I am asking you here this basic question. Kailash

## sampling freq for combined filter

Started by in Matlab DSP17 years ago 1 reply

Hi, Can anybody please tell me how to set up the sampling freq for a combined filters. The sampling freq for the input signal to...

Hi, Can anybody please tell me how to set up the sampling freq for a combined filters. The sampling freq for the input signal to the first filter h1 is 1.5Mhz, the output of the first filter is then downsampled to 96khz and feed into the second filter h2. h12 is the convolution

## frequency sampling filter design code

Started by in Matlab DSP18 years ago 1 reply

Hi, I am sreedhar. i am some problem with designing the frequency sampling fir filter, i need a frequency sampling...

Hi, I am sreedhar. i am some problem with designing the frequency sampling fir filter, i need a frequency sampling filter design matlab code, actually i want to do the design using the genetic algorityhm, but i am confused with the selection of length of th

## Changing sampling frequency

Started by in Matlab DSP11 years ago

A filter designed at 1kHz sampling rate, when used at 4kHz sampling rate, its frequency response will be stratched 4 times. For example the...

A filter designed at 1kHz sampling rate, when used at 4kHz sampling rate, its frequency response will be stratched 4 times. For example the new cut-off frequency will be 4 times the original. If you want to keep similar frequency responce as the original, you need to redesign the filter. Normally you have to use more cofficients in the new design in order to keep the same shape. Use the filt...

## Sampling

Started by in Matlab DSP18 years ago

Hi! ? am new for matlab and i want to learn how to do sampling with matlab.For example my problem; i take a wav file and read...

Hi! ? am new for matlab and i want to learn how to do sampling with matlab.For example my problem; i take a wav file and read it with u=wavread('b'); now i have to sample it with n=1000 samples.Can anybody help me? Thanks in advance. Sevin? Bayram

## help with down sampling

Started by in Matlab DSP17 years ago

Hi guys.. Can anyone help me how to spin and de spin the data in matlab and then pass it into a matched filter and down sample...

Hi guys.. Can anyone help me how to spin and de spin the data in matlab and then pass it into a matched filter and down sample it... Actually I got to the point until de-spinning it but don't know how to do the down sampling part... Hoping 2 c any response... Div

## help for ZOH block

Started by in Matlab DSP18 years ago 1 reply

Hi, Can any one help with simulik zero order hold (zoh) block. I want the sampling time in the zoh block as a varying input during...

Hi, Can any one help with simulik zero order hold (zoh) block. I want the sampling time in the zoh block as a varying input during simulation run. My sampling time of the zoh block is changing and i want to hold the input signal for that varying hold time (Sampling time paramet

## Plotting FRF magnitude vs frequency

Started by in Matlab DSP13 years ago

I am working on modal testing of structures using forced hammer excitation. Response time series has a sampling frequency of 250Hz and the...

I am working on modal testing of structures using forced hammer excitation. Response time series has a sampling frequency of 250Hz and the excitation time series has a sampling frequency of 500Hz. Should the plot of FRF magnitude versus frequency be as a function of the response or excitation frequency? Or which sampling frequency would govern the FRF plot? Secondly, for a single-point excitati...

## Nonuniform SAmpling FIR

Started by in Matlab DSP20 years ago

>Hi .... We are developing a nonuniform frequency sampling FIR digital filter (lowpass) with linear phase using Matlab5.3 and DSP...

>Hi .... We are developing a nonuniform frequency sampling FIR digital filter (lowpass) with linear phase using Matlab5.3 and DSP toolbox (I dont remember the version of the DSP), however, We have arrived to a stuck point in the code becouse i am not very pro in Matlab. We have de

## random row sampling

Started by in Matlab DSP12 years ago 2 replies

Hi all, Suppose I have a matrix X as follows, 2 3 4 1 8 7 6 2 1 2 5 7 4 7 2 ...

Hi all, Suppose I have a matrix X as follows, 2 3 4 1 8 7 6 2 1 2 5 7 4 7 2 3 Then how should I write a code to sample two row ramdomly (called Y) from that matrix. At last, I must have two matrix; X matrix must become 2x4 (with remaining row after sampling) and Y matrix (2x4). Please help me as soon as possible. Thanks i...

## help needed , plotting a signal

Started by in Matlab DSP15 years ago 7 replies

Hi everyone, Just one little question. I want to plot a signal y (where y is a column of a matrix). The sampling rate was 500Hz Is...

Hi everyone, Just one little question. I want to plot a signal y (where y is a column of a matrix). The sampling rate was 500Hz Is there a way when using the plot command (i.e. plot(y) ) to view the time (x ax) in seconds and not in sampling points? Thank you in advance Christos Katsis

## bandpass sampling

Started by in Matlab DSP19 years ago

hi, i need to plot the bandpass signal sampling waveforms. (something like fig 2.9 ,pg 37 in understanding digital signal...

hi, i need to plot the bandpass signal sampling waveforms. (something like fig 2.9 ,pg 37 in understanding digital signal processing by richard g.lyons) i dunno how to do it.. can anyone help me...

## Incorporating different sampling rates.....

Started by in Matlab DSP17 years ago 1 reply

Hello, I have a couple of questions regarding control system simulation: -- How could I incorporate different sampling rates...

Hello, I have a couple of questions regarding control system simulation: -- How could I incorporate different sampling rates in a single feedback system using Simulink ? Can simply having different 'sample time' values (relatively prime) in different blocks solves the p

## Sub-Nyquist Sampling

Started by in Matlab DSP17 years ago 4 replies

I am having some difficulty understanding the sub-nyquist sampling theory. For example: if you have an ADC that can only...

I am having some difficulty understanding the sub-nyquist sampling theory. For example: if you have an ADC that can only operate at 250MHz, then the max bandwidth is 125MHz. However, if I wanted 1000MHz and I want to use the same ADC, the bandwidth would "fold"

## sampling rate ????

Started by in Matlab DSP18 years ago 6 replies

hello, i am a new student of dsp. we know for a bandlimited signal,in order to avoid aliasing the samplig rate should be >= 2*...

hello, i am a new student of dsp. we know for a bandlimited signal,in order to avoid aliasing the samplig rate should be >= 2* maxfrequency..... but what should be the sampling rate for a signal whose spectrum is from (10-25)hz (say)... i.e. for a non-baseband signal..

## Simple butter filtering question!

Started by in Matlab DSP12 years ago 1 reply

Hello everyone, I was wondering if anyone could give me their insight to this problem. I am trying to understand how to use a bandpass filter...

Hello everyone, I was wondering if anyone could give me their insight to this problem. I am trying to understand how to use a bandpass filter in butter to pass only a certain band of frequency. This works for a simple cosine with one frequency, but with a summation of cosines.. dt=.001; %sampling rate Fs=1/dt; %sampling freq HalfFs=Fs/2; t=-10:dt:10; m=cos(2*pi*49*t)+cos(2*pi*50*t); ...

## Fsk code

Started by in Matlab DSP13 years ago

Hi,I would like to ask about my Fsk code.Why when i change my ts value to 0.05 or 0.005,i'm not able to get the correct Fsk signal?Anybody can...

Hi,I would like to ask about my Fsk code.Why when i change my ts value to 0.05 or 0.005,i'm not able to get the correct Fsk signal?Anybody can help me?Below is what my code looks like.. echo on t0=0.6; %signal duration ts=0.0005; %sampling interval fc=200; %carrier frequency kf=50; %modulation index fs=1/ts; %sampling frequency t=(0:ts:t0); %tim...

## ?? sample rates more than 100kHz

Started by in Matlab DSP17 years ago 2 replies

hi everybody, i am not able to obtain a sampling rate more than 110 kHz using MATLAB or BORLAND C++ 5. If I use more than 1 MHz...

hi everybody, i am not able to obtain a sampling rate more than 110 kHz using MATLAB or BORLAND C++ 5. If I use more than 1 MHz sampling rate, then more and more samples has the same value; getting a random step waveform. If any body knows how to obtain higer sample rates of th