sampling theorem

Started by ravirevolt in comp.dsp14 years ago 2 replies

i've done my sampling like this is it correct ? i'm sampling a 3GHz signal; design for 8 bit sample double array[256]; //8 bit so double...

i've done my sampling like this is it correct ? i'm sampling a 3GHz signal; design for 8 bit sample double array[256]; //8 bit so double amplitude=100; double frequency=3000000000; for(int i=0;i


How to do non-uniform (sampling) DFT?

Started by walala in comp.dsp15 years ago 10 replies

Hi all, Can anybody point me to some helps/tutorials/references/stories on how to do non-uniform (sampling) DFT? Thank you very much for...

Hi all, Can anybody point me to some helps/tutorials/references/stories on how to do non-uniform (sampling) DFT? Thank you very much for your help, -Walala


Filter Design

Started by Chandra in comp.dsp13 years ago 4 replies

Hi Guys, I want to have a band pass filter with cutoffs 0.15Hz and 2Hz and also a low pass filter with a cutoff of 10Hz. I want to choose...

Hi Guys, I want to have a band pass filter with cutoffs 0.15Hz and 2Hz and also a low pass filter with a cutoff of 10Hz. I want to choose either one at a time. I have to give the sampling frequency to both filters and so if I give the same sampling frequency, is it not going to be a problem? How do we decide which sampling frequency works well for both filters? Please give me some info ove...


Synchronization in OFDM systems

Started by DerekDSP in comp.dsp10 years ago 5 replies

Hi, I'm new to OFDM. I read in several textbooks and papers that timing synchronization can be separated into symbol synchronization and...

Hi, I'm new to OFDM. I read in several textbooks and papers that timing synchronization can be separated into symbol synchronization and sampling clock synchronization. The latter can be further broken down into sampling phase offset and sampling frequency offset. There is also carrier frequency synchronization (i.e., carrier frequency recovery technique), which is utilized to eliminate the...


Nyquist rate for sampling complex-valued data?

Started by kiki in comp.dsp15 years ago 14 replies

I (vaguely) heard that sampling complex-valued data does not abide by the Nyquist rate criteria, i.e., the sampling rate fs can go lower than...

I (vaguely) heard that sampling complex-valued data does not abide by the Nyquist rate criteria, i.e., the sampling rate fs can go lower than Nyquist rate and it still can avoid aliasing and reconstruct perfectly... Is that true? Any theory behind it? Thanks a lot


question on FIR channel

Started by philgo in comp.dsp14 years ago 13 replies

hi, suppose I have the FIR channel with 10 taps. My target sampling rate is, for example, 50MHz, i.e., the sampling period is 20ns. But my...

hi, suppose I have the FIR channel with 10 taps. My target sampling rate is, for example, 50MHz, i.e., the sampling period is 20ns. But my channel taps do not fall on integer units of the sampling period, say they fall on 33, 44, 55, 66, 77, 88, 99, 111, 122, 133 ns respectively. What shall I do to create a FIR channel with taps falling exactly on integer number of samplings? thank you in a...


A Scale-Invariant "Shannon" Sampling Theorem for the Wigner Distribution!

Started by Mark in comp.dsp8 years ago 1 reply

This is something I noticed a short while back which I've not seen explicitly mentioned as such. The Wigner distribution, when applied to the...

This is something I noticed a short while back which I've not seen explicitly mentioned as such. The Wigner distribution, when applied to the analytic signal associated with a real signal, has a 1/2-continuous 1/2-discrete sampling grid built into it that is scale invariant and hyperbolic, much like the sampling grid for the discrete wavelet transform; and it can be reproduced by its sampl...


Demo, CTFT to DTFT, sampling

Started by Nasser M. Abbasi in comp.dsp10 years ago 1 reply

Hello; I wrote this basic demo to help me learn about DSP for a class (digital filtering) at my school that I am taking now, which...

Hello; I wrote this basic demo to help me learn about DSP for a class (digital filtering) at my school that I am taking now, which illustrates sampling a signal, then it generates the CTFT (cont. time Fourier transform) and then the DTFT (discrete time Fourier transform) from the samples. Both the magnitude and the phase are plotted. One can adjust the sampling frequency, signal dura...


Over-sampling with TMS320LF2407A

Started by Ajay in comp.dsp15 years ago 11 replies

The Systems and Peripherals guide for the above processor states the following for the ADC: ------------------------------------ It is also...

The Systems and Peripherals guide for the above processor states the following for the ADC: ------------------------------------ It is also possible to sample the same channel multiple times, allowing the user to perform "over-sampling", which gives increased resolution over traditional single sampled conversion results. ------------------------------------ How do I achieve this?


FIR filter sampling frequency

Started by Zeph80 in comp.dsp14 years ago 10 replies

I have some questions regarding the sampling frequency of a digital filter? This is the rate at which the internal stages are clocked, why does...

I have some questions regarding the sampling frequency of a digital filter? This is the rate at which the internal stages are clocked, why does this have to be twice the incoming data rate. I don't understand where Nyquist comes in the filter design.Our incmoing data was generated by sampling a analog at twice frequency, and now my filter must run at twice the data rate.Why?


Sampling rate and baud rate

Started by Richard_K in comp.dsp12 years ago 4 replies

For OFDM system with the sampling frequency of 50MHz and BPSK modulation scheme,what will be the data rate at physical layer? Will it...

For OFDM system with the sampling frequency of 50MHz and BPSK modulation scheme,what will be the data rate at physical layer? Will it be 50Mbits/second as well? Please help. Thanks.


Changing the sampling rate of an audio signal.

Started by ma in comp.dsp15 years ago 22 replies

Hello, I want to change the sample rate of an audio signal. Where can I find some information about it? Some mathematical model and some...

Hello, I want to change the sample rate of an audio signal. Where can I find some information about it? Some mathematical model and some source code would be perfect. What I want to do is: I have a device that can play audio signal with the sampling rate of 8KSPS. If I want to play a signal that is samples at say 44KSPS I need to change the sampling rate. How can I d...


changing sampling rate of filter coeficients

Started by turboii in comp.dsp11 years ago 8 replies

I need to implement a particular filter that has 240 taps and it works/designed for a sampling rate of 125kHz. I want to change the sampling...

I need to implement a particular filter that has 240 taps and it works/designed for a sampling rate of 125kHz. I want to change the sampling rate of the filter from 125kS/s to 250kS/s to match the the hardware I am using, which operates at 250kS/s if i run the filter as is (at 250kS/s), the spectrum of the filter is stretched by 2. Is there an easy way to modify the filter taps to change ...


About sampling

Started by Jani Huhtanen in comp.dsp14 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...


IF sampling- basics

Started by Kris Gurumoorthy in comp.dsp8 years ago 9 replies

Hi I am interested in learning about IF sampling and its basics. any useful literature that you can point me to would be useful thank you

Hi I am interested in learning about IF sampling and its basics. any useful literature that you can point me to would be useful thank you


effects of variable sampling rate on spectrum of a signal

Started by Mitja Nemec in comp.dsp9 years ago 39 replies

Hi guys I have a repetitive action controller which is generating/controlling signal with 1024 sampling points/intervals in one period...

Hi guys I have a repetitive action controller which is generating/controlling signal with 1024 sampling points/intervals in one period of fundamental harmonic. The frequency of fundamental harmonic is somewhere between 40 Hz and 70 Hz. No mater what the frequency of fundamental signal is I always have 1024 sampling points/intervals in order to get good results from FFT/DFT (no spectral lea...


Re: The inherent periodicity of the Discrete Fourier Transform

Started by Jerry Avins in comp.dsp9 years ago

On Tuesday, February 8, 2011 5:52:36 PM UTC-5, glen herrmannsfeldt wrote: ... > I see no-one followed up on my attempt to get away from...

On Tuesday, February 8, 2011 5:52:36 PM UTC-5, glen herrmannsfeldt wrote: ... > I see no-one followed up on my attempt to get away from the DFT, and > toward sampling theory. The same math that covers the periodicity > of the DFT also comes out in sampling with a finite number of > samples. ... See my post of 1 Feb. Jerry


Some 21161 EZ Kit questions

Started by Lord DSP in comp.dsp13 years ago 2 replies

Hello, Two things I want to do with my EZ Kit. Firstly I want to goose the sampling frequency up to 96KHz. Secondly I would like to use...

Hello, Two things I want to do with my EZ Kit. Firstly I want to goose the sampling frequency up to 96KHz. Secondly I would like to use the EZ Kit as a USB soundcard. Regarding goosing the sample frequency; I thought this was going to be easy since there's a sampling frequency setting jumper on the board. Doh!, That is, until I discovered that it's only for the auxilliary DAC. ...


What is the advantage on high-sampling rate ?

Started by Arthur in comp.dsp16 years ago 66 replies

Hello all, Recently, there is a tendency to use high sampling rate 96 KHz, 192 KHz in the audio application. To my knowledge, about ~ 20 KHz,...

Hello all, Recently, there is a tendency to use high sampling rate 96 KHz, 192 KHz in the audio application. To my knowledge, about ~ 20 KHz, everything will be cut off from the loudspeaker, amplifier, etc.. So, why 96 KHz, 192 KHz instead of 48 KHz.. Regards Arthur


sampling a wav file

Started by sharatechno in comp.dsp13 years ago 15 replies

hi I am new to this forum and processing wav files. I want take a wav file as input and give an array which contains values of samples of the...

hi I am new to this forum and processing wav files. I want take a wav file as input and give an array which contains values of samples of the audio signal as output according to the sampling frequency. I am in a position where I cannot decipher any open-source softwares, a simple program in c/c++ or python will help me. Thanks in anticiaption