| Search found 94 matches on edaboard.com: fft spectrum matlab fft spectrum matlab fft spectrum analyser frequency spectrum fft stft window transient spectrum matlab |
skin effect of transients versus skin effect of sine wave
how can i calculate the skin effect or rather the depth of the skin effect in a large conductor when the current is high voltage transients. i can find tables and formulas for skin effect of sine waves, but not for transients....
Electronic Elementary Questions :: 22 Nov 2009 15:47 :: Monolith :: Replies: 13 :: Views: 282
matlab, how to get frequency spectrum?
hi all,i am a matlab newbie :)how to get frequency spectrum of a vector data? (something like [3 4 2 10 ...])i heard fft is the time-frequency fransform. and i tried fft() function in matlab.but it return a complex number. is it stand for both freque...
Electronic Elementary Questions :: 15 Nov 2009 18:42 :: Aya2002 :: Replies: 27 :: Views: 19320
mc cdma algorithm
is there anyone here have a simple mc cdma matlab code.... with any specification.....i just want to have a brief idea.....thanks a lot...
Digital Signal Processing :: 14 Nov 2009 6:26 :: Communications_Engineer :: Replies: 7 :: Views: 2052
matlab program for sfdr!
hi all,i am trying to simulate adc for sfdr,snr,thd and sndr. the matlab code is attached as below. i am new in matlab and couldnt fully understand the program.to simulate, i input low frequency sinewave signal and the adc is running at 50ms/s. shoul...
Analog IC Design & Layout :: 04 Nov 2009 2:34 :: euniceliu :: Replies: 6 :: Views: 3315
cdma matlab simulation
hi there,i have some questions regarding a cdma matlab simulation result.figure1 here represents the fft convertion of a randomly generated baseband signal up to 1000 bits. on the other hand, the figure2 here is the fft conversion of the baseband sig...
Digital communication :: 31 Oct 2009 16:04 :: vadherasiddharth :: Replies: 8 :: Views: 5556
may be some one make use of this topic
sampling---------------------------converting an analog signal to a digital one is a necessary step for a computer toanalyze a signal: modern computers are digital machines, and can store only digital values.in the continuous function x(t), we replac...
Digital Signal Processing :: 28 Sep 2009 18:57 :: Aya2002 :: Replies: 12 :: Views: 2237
how to use aditional mean value in fft matlab????please help
help please!!!!i have sinwave with 0.1 v amplitude and 1khz frequency mixed with 5v white noise.i used fft in matlab to simulate. 1-(study the use of additional mean value calculation of every data set of fft spectrum and how it affects the visibilit...
Digital Signal Processing :: 27 Sep 2009 13:19 :: program2 :: Replies: 0 :: Views: 171
dft x(k) frequency spectrum is not what was expected
hi,can someone tells me how x(k) change f we doubled the sampling freuqency...
Digital Signal Processing :: 25 Sep 2009 13:47 :: awanis :: Replies: 14 :: Views: 462
need help to implement this matlab code to calculate sfdr..
does anyone have implemented the codes below?im thinking that i put a sine wave as input of my 8-bit adc and take directly the output of my adc..am i right?and lastly how the file test.load look like or how is the arrangement of the data inside? this...
Analog IC Design & Layout :: 21 Sep 2009 15:39 :: kickbeer :: Replies: 2 :: Views: 435
help on fft - where it is used, links to its uses
hi friends,sorry for a strange question, but can anyone tell me where fft is used?i think it would be useful for all the beginners in digital signal processing.please everybody, give, maybe, some links or say (in two words) where you implemented your...
Digital Signal Processing :: 11 Sep 2009 17:07 :: Communications_Engineer :: Replies: 4 :: Views: 554
how to determine sfdr, snr, sndr of adc with ltspice
hello,the standard sfdr is 48dbc. what does it mean, when sfdr is higher than 48dbc or lower than that value?thank you very muchregards,kickbeer...
Analog IC Design & Layout :: 10 Sep 2009 20:56 :: kickbeer :: Replies: 11 :: Views: 774
few clarification on snr/sndr calculation
hi all,i need some clarification on calculating snr/sndr.i did cadence simulation of a sample and hold circuit and then took the fft of the output. ( i did that keeping in mind the proper method of dealing sample data ffts)now i want to calculate the...
Analog Circuit Design :: 11 Aug 2009 23:58 :: rmiguel :: Replies: 3 :: Views: 522
does upsampling or downsampling change the frequency content
hi ppl,does ups ampling or down sampling a signal change its frequency content.since up sampling increase the number of zero valued samples in the signal i think it should decrease the dc content of the signal. and again as up sampling increaseboth t...
Digital Signal Processing :: 06 Aug 2009 9:48 :: Petre Petrov :: Replies: 7 :: Views: 884
time<->frequency conversions and displaying in matlab
hii know that to convert to frequency domain i need to do the fft and ifft to convert to time domain.but how to display it right in matlab? suppose that i generate signal in time/frequency domain and need to convert to frequency/time domain.---------...
Digital Signal Processing :: 04 Aug 2009 11:39 :: kafentz :: Replies: 1 :: Views: 318
ifft and fft in matlab
hi i want to ask whether there is any difference between taking n-point ifft and then fft for ofdm vs taking ifft and then n-point fft in matlab.the difference i get is the signal with n-point ifft and then fft has a spectrum which do not have good r...
Digital Signal Processing :: 07 May 2009 8:01 :: shamma :: Replies: 0 :: Views: 582
matlab - power spectrum
hi,i am new to matlab. i would like to ask how can i plot the power spectrum like the one below (see file attached) from a wave file. i have tried something like below but it didnt turn out what i wanted.)any info/help is much appreciated.my apologie...
Digital Signal Processing :: 06 May 2009 8:43 :: asd09 :: Replies: 0 :: Views: 1365
real dft and complex dft in matlab
hi all,i have recently been reviewing dsp (i did dsp at university a number of years ago and am trying to refresh). i have recently just read a textbook i found (not from my university studies) that has been very helpful. in the book they distinguish...
Digital Signal Processing :: 28 Apr 2009 23:11 :: diaks :: Replies: 8 :: Views: 2952
audio spectrum - need help with the matlab code
file has two tracks in it, so i just used one of them. the sampling rate is indicated in the file properties as 44 khz.i wrote the matlab code as below:sound=wavread(081029_08.wav);a=sound(:,1);b=abs(fftshift(fft(a)));n=length(b);fs=44000;f=(fs/......
Electronic Elementary Questions :: 28 Mar 2009 21:19 :: FvM :: Replies: 3 :: Views: 345
explain zero padding in ofdm
wy implement the zero padding at the ends not in the centersee below, please helphttp://images.elektroda.net/82_1236162732_thumb.jpghttp://images.elektroda.net/56_1236162819_thumb.jpgthanks in advance...
Digital communication :: 27 Mar 2009 0:18 :: Aya2002 :: Replies: 28 :: Views: 1401
matlab truth
hi experts, i have a quistion here, please read the following paragragh as it is in a pdf document on the web:the fourier transform can be computed using the matlab codefk = fft(fn)/n; % the fft of the signal fnfn = ifft(fk)*n; % the inverse fftifft(...
Digital Signal Processing :: 14 Mar 2009 21:08 :: Aya2002 :: Replies: 5 :: Views: 1443
help needed about matlab's windowed fft precision!!
hi everybody,ive met a weird problem really makes me desperate.the problem is as below,as we know, hann windows spectrum is defined as on the use of windows for harmonic analysis with the discrete fourier transform, f. j. harris, proceedings of the i...
Digital Signal Processing :: 10 Mar 2009 8:14 :: rramya :: Replies: 12 :: Views: 912
spectrum analysis with the fft basics and matlab 4 begineers
hi every one,i would like to share some of the uses of fft for spectrum analysis.hope it will be useful for those who are novice to matlab programming.dft notes:dft produces a discrete frequency domain representation.also, dft is only defined in the ...
Digital Signal Processing :: 09 Mar 2009 21:25 :: ILv2Xlr8 :: Replies: 12 :: Views: 2622
matlab fft
hi all,i am trying to do the fft on the digital output of sd modulator in matlab.can anyone tell me how to use the window function in matlab(hamming window) and how to plot the spectrum after this.i am new to matlab programing.thanks a lot...
Analog Circuit Design :: 07 Mar 2009 17:51 :: Aya2002 :: Replies: 2 :: Views: 948
help!!! precise spectrum analysis using matlab
de i use now is shown asfs = 2e6; % sampling frequencyt = 1/fs; % sample timel = 2000000; % length of signaly = output(2001:(l+2001),2);nfft = 2^nextpow2(l); % next power of 2 f...
Digital Signal Processing :: 07 Mar 2009 7:58 :: rramya :: Replies: 1 :: Views: 522
interview questions on dsp - open thread - please contribute
hi,most of you mustve already passed that interview stage and some others could be the interviewers themselves. so, i thought this thread should be helpful to everyone and anyone who is not just attending an interview but wants to know more about dsp...
Digital Signal Processing :: 02 Mar 2009 10:25 :: Communications_Engineer :: Replies: 61 :: Views: 12895
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matlab problem
hi everyone,is there anyone who knows how to prove the modulation property in discrete time fourier transform?...
Electronic Elementary Questions :: 08 Feb 2009 2:17 :: eng_shady00 :: Replies: 10 :: Views: 540
experts of lecroy scope, fft, and matlab... pls assist!
hello,weve a lecroy waverunner 204xi. recently, i performed the fft (using scope fft function) of a measured signal. however, i found out, when i calculated the fft of the measured signal in matlab, the results are different from that obtained from t...
Electronic Elementary Questions :: 06 Jan 2009 9:45 :: powersys :: Replies: 7 :: Views: 1098
cro + matlab = spectrum analyzer ?
hii took the picture attached from cro and i want to analyze it using matlab to know the harmonic components in iti dont have a spectrum analyzer so i want to use matlab to do this function.any help??regards...
Software Problems, Hints and Reviews :: 05 Jul 2008 5:50 :: kender :: Replies: 7 :: Views: 570
voice record by matlab
hi,please help me to record voice by matlab in real time.regards...
Digital Signal Processing :: 19 Jun 2008 12:52 :: xulfee :: Replies: 2 :: Views: 1089
spectrum of digital levels.
hi!please somebody resolve my problem of finding the spectrum of logic levels obtained form adc output.i am actually testing a rf chip where i gave input as sine wave and obtained the output form adc placed at the end of receiver chain.but to confir...
Digital communication :: 26 May 2008 9:12 :: echo47 :: Replies: 7 :: Views: 306
usb1 access using matlab
can someone please tell me how to access the usb port using matlab? is there some similar mechanism available like the serial class?i am able to access it using java, but i am facing some problems.thanks a whole lot in advance....
Digital Signal Processing :: 07 May 2008 5:40 :: akrcal :: Replies: 5 :: Views: 900
matlab script for adc snr post-processing
hi, i have some question regarding the script i got. part of it is as follows:...% create the minimum, 4-term blackman-harris window for fftpwr_win=0;for i=1:nt %where nt is the no. of fft bins window(1,i)=0.35875-0...
Analog Circuit Design :: 18 Mar 2008 2:19 :: pseudockb :: Replies: 0 :: Views: 255
plotting frequncy plot reading values from excel file
sub:plotting frequncy plot reading values from excel filei want to plot time and frequency plots reading from excel file.the following lines are helpful for reading from excel file and selecting perticular column also.time = xlsread(d:\installed\matl...
Software Problems, Hints and Reviews :: 24 Feb 2008 14:34 :: dspman :: Replies: 1 :: Views: 314
help on card sound
hi, i would like to know the relationship between the sounding intensity in db and the output voltage of the sound cardthankk you...
Software Problems, Hints and Reviews :: 06 Feb 2008 14:18 :: Foufou :: Replies: 14 :: Views: 440
help me to analyse spectrum of discrete signal in matlab
i have a analog signal through the lowpass filter(fc=40hz) then i sample it which fsample =40hz, and i recieve 200 pieces of that signal into my computer by sampling which f(sample) =40hz.and my problem is how i can analyse spectrum of those 200 piec...
Electronic Elementary Questions :: 18 Dec 2007 6:41 :: cesare :: Replies: 4 :: Views: 238
kindly help me in sampling this bandpass signal...
simply i have taken a four channel amplitude modulated signal for my test purpose. the broadcast range of am is from 535khz-1700khz..(for now i have just chosen four random carriers at which the signal is being modulated). infact i m going to sample ...
Digital Signal Processing :: 01 Dec 2007 18:41 :: ednan :: Replies: 6 :: Views: 282
getting coefficiency of fft spectrum use matlab
hello.. i am noob in using matlab.. and i try to find many source and coding d. but still donno how to get the fft co-efficiency using cheby2.i record my voice in .wav and i try to get the co-efficiency of the fft frequency spectrum. below is some of...
Software Problems, Hints and Reviews :: 09 Nov 2007 16:58 :: pokyeah85 :: Replies: 0 :: Views: 123
regd matlab code for calculation of power spectrum in sd-adc
am a bit new to using matlab for simulation of sigma delta adcs...have a few doubts:1)while calculating output power spectrum we take the fft and plot only single sided spectrum...this is because the spectrum is symmetrical...but isnt the spectrum fr...
Analog IC Design & Layout :: 13 Oct 2007 3:54 :: vrs007 :: Replies: 0 :: Views: 255
how to perform fft analysis
hello, everyone,can anyone tell me how to perform fft (fast fourier transform) analysis with hspice integrated in cadence analog artist development environment. is there any special option within this tool ? i only find four analysis options : dc ,ac...
Analog Circuit Design :: 01 Oct 2007 12:04 :: sankudey :: Replies: 10 :: Views: 774
how do i analyzing frequency using matlab
i want to analyze frequency which is recorded in matlab using wavrecord command ,what is the highest frequency (for select best sampling rate next time recording)reduced noiseunderstand behavior of frequencyplz anybody knows those thing post it for ...
Digital Signal Processing :: 29 Aug 2007 3:01 :: brmadhukar :: Replies: 2 :: Views: 183
heterodyne signal processing
hi,i am trying to capture a signal from an experiment with a detector. this signal has a particular frequency, about 5khz, the spectral width should not be more than 0.2khz. i am trying to capture and record the amplitude of this signal. i have a dig...
Electronic Elementary Questions :: 23 Aug 2007 14:37 :: watertreader :: Replies: 0 :: Views: 162
help me in matlab code ...
leared.... i m posting some of my results(pics) of the above code , plz try download it and try to explain me from these ........ 1) first the original signal in text form ,i read it in matlab 2) the fft of the origial signal ( this gives a complex p...
Digital Signal Processing :: 07 Aug 2007 7:58 :: vjfaisal :: Replies: 5 :: Views: 216
separation of signal from noise in sigma delta adc
hi, i am working on sigma delta modulator based adc.i have output bitstream from the modulator and would like to measure snr and sndr using fft. how could i possibly separate the signal and noise from the output of modulator?also, is there anyway to ...
Digital Signal Processing :: 28 Jul 2007 21:28 :: Dmitrij :: Replies: 3 :: Views: 408
spread spectrum: matlab debug
hi, friends, i write a matlab program to simulate the spread spectrum result. fft is used to view the spectrum of the modulated signal. the spectrum should be same with differenct sample points. in the matlab program, tstep and tstop will dicide the ...
Analog Circuit Design :: 18 Jul 2007 16:00 :: hmsheng :: Replies: 0 :: Views: 282
divider
hi everybody,i have a question regarding the divider: say i have a divider working at 2ghz, for some reason, there is another signal is added to this 2ghz, (say 2.1ghz), i am wondering whether or not this divider will divide this 2.1ghz? or can i see...
RF, Microwave, Antennas and Optics :: 15 Jul 2007 2:14 :: echo47 :: Replies: 5 :: Views: 306
help me in fft normalization!!
hiplease help me , if anyone knows q1: how to normalize the fft plot.q2: how to convert fft normalize frequency in hertz along x-axisplease help me in these questions....best regards...
Digital Signal Processing :: 09 Jul 2007 14:43 :: vibcon :: Replies: 4 :: Views: 873
eliminate the noise
hi friendi use fft function of matlab to a non-stationary signal and get the below figure and i want now to elimnate the noise i think it is a white noise i test the butterworth filter function but i can to eliminate this noisehttp://www.warst.com/im...
Digital Signal Processing :: 08 Jul 2007 4:21 :: echo47 :: Replies: 8 :: Views: 315
spectrum analysis code in matlab(urgently required)
i m new in matlab so i want code of spectrum analysis in matalb i need it urgently ...
Digital Signal Processing :: 03 Jul 2007 13:49 :: echo47 :: Replies: 49 :: Views: 8250
need help in matlab ( how to convert in microvolt)
hi i have got a problem in converting my y-axis in microvolts.as i have use, the normaized frquency (along x-axis ) and measure voltage along (y-axis), i have normalized my both axis, now i wnt to be my y-axis normalizes range be in micro volts.so p...
Digital Signal Processing :: 02 Jul 2007 6:05 :: echo47 :: Replies: 16 :: Views: 453
simulating phase noise...
how can i do....how can i simulate phase noise in hspice??...
Electronic Elementary Questions :: 30 Jun 2007 13:25 :: jasmin_123 :: Replies: 6 :: Views: 783
window and filter an audio signal
tlab.i need to filter a signal saved in a .wav file. im reading it using the function wavread and then i create several frames of it through hamming window with an overlap of 50%. at this point i use fft to compute the spectrum of each frame and i ma...
Digital Signal Processing :: 19 Jun 2007 11:06 :: kastantin :: Replies: 1 :: Views: 225
how to measure the dynamic specifications like sinad of adc?
hi all..i am trying to measure the dynamic specs of 8 bit pipeline adc in spectre ..to perform the measurement i give a sinusoidal input of 1.245mhz and my clock frequency is 15.360 mhz...i ve derived these values with the relation fin/fsample=nwindo...
Analog Circuit Design :: 01 Jun 2007 9:42 :: geethki :: Replies: 4 :: Views: 762
dsp problem - help
can anyone please give me a solution of the following problem?thanks!implementation of a filter in c-------------------------------------------1.) realize a transversal filter routine such that for every input an output is created. the length of the...
Digital Signal Processing :: 17 May 2007 10:46 :: snoopfan :: Replies: 0 :: Views: 258
limitations in fft in matlab?
i have a question regarding using fft i matlabwhen i make an fft of a small number of periods of a signal the frequencys are moved up to a larger value, for example a signal with the frequency 3hz are shown in the fft plot as 3.5hz and so on. if i in...
Digital Signal Processing :: 05 May 2007 11:43 :: wpchan05 :: Replies: 3 :: Views: 249
need help in this matlab question!!!!!!!!!!!
hiplease help in these concepts , as it is not cleared from the help of matlab.what is the difference b/w freqz and fft commands in matlab.and kkindly tell me, which command is used at which moment.....best regards...
Digital Signal Processing :: 03 May 2007 22:19 :: vjfaisal :: Replies: 4 :: Views: 960
vco spectra
hihow can i display the spectrum or side-bands of a vco on matlabcan anyone helps?...
Analog Circuit Design :: 30 Mar 2007 11:09 :: crossbow_123 :: Replies: 6 :: Views: 504
matlab lpc command (linear prediction)
hi,i was wondering how do you get the spectrum of the lpc (linear prediction). i did the following:a = lpc(x,10);a = fft(a);plot(abs(a));is this right?also i choose the model order as 10 just as a starting point, my final model order will be when the...
Electronic Elementary Questions :: 03 Mar 2007 22:33 :: dspman :: Replies: 3 :: Views: 699
how to display time domain signal in frequency domain?
hi friends, i am trying to display time domain signal in frequency domain using matlab.i took frequency of signal as 100hz and sampling frequency as 1000sampels/seci have tried using fft function but not getting.anyone of you give me the solution ...
Digital Signal Processing :: 27 Feb 2007 16:18 :: ricksidd :: Replies: 3 :: Views: 276
generating and testing awgn???
hi all, i want to generate white noise phisically to test my filters.i used the matlab commands (wgn(),sound()) to generate the noise using the sound card .but when i tested the fft of the output signal the spectrum is not flat which it should be.is...
Digital Signal Processing :: 19 Feb 2007 14:48 :: Sal :: Replies: 1 :: Views: 123
help : calculation of dispersion diagram
dear friends, my research interest is photonic crystals and periodic dispersive structures. as you know, dispersion diagram is one of the most important properties of periodic structures which is noticed extremely. to calculate dispersion diagrams by...
Electromagnetic Design and Simulation :: 23 Dec 2006 1:16 :: yaswanthr :: Replies: 4 :: Views: 1143
osilloscope program ?
what kind of prog is there to show the spectrum of music file in a player window.detail is required for me ....
Digital Signal Processing :: 15 Dec 2006 12:21 :: kronos2k3 :: Replies: 3 :: Views: 192
audio signal analysis for comparing two signal
i want to do audio signal analysis for comparing two signal.i think radix-2 fft decimation-in-frequency algorithm is good enough.please correct me if i am incorrect.i want to do this on 8bit micro controller with internal 10bit adc.please give info l...
Digital Signal Processing :: 08 Dec 2006 10:44 :: Drago :: Replies: 15 :: Views: 417
digital modulation spectrum in matlab
the communication blockset of matlab provides digital modulation functions like pskmod, qam, fskmod. however, matlab uses baseband representation (lowpass equivalenta) of modulated signal. i need to display the frequency domain representation of the ...
Digital communication :: 04 Dec 2006 16:20 :: magnetra :: Replies: 4 :: Views: 324
fft matlab problem
can anyone guide me how to using the matlab command fft to convert voice time domian to frequency domain?please teach me...:cry:...
Digital Signal Processing :: 13 Nov 2006 16:33 :: intelnside :: Replies: 24 :: Views: 1863
dsp sampling theorem matlab questions
hello ppl, i m questioning myself why is this happening.ive implemented the following system using simulink. basically i am feeding a 1khz pure sinewave and multiplying it by a pulse having a period of 10 samples and pulse width is 1sample(10us). so ...
Digital Signal Processing :: 08 Nov 2006 5:49 :: bcl :: Replies: 4 :: Views: 1008
how i can start dsp
hi all how i can start dsp :( s 8o kratplease fix your keyboard!!your caps-lock is broken/davorin...
Digital Signal Processing :: 25 Aug 2006 13:26 :: shaikhsarfraz :: Replies: 33 :: Views: 3099
matlab program for sfdr
hi all,i am trying to simulate adc for sfdr,snr,thd and sndr. the matlab code is attached as below. i am new in matlab and couldnt fully understand the program. to simulate, i input low frequency sinewave signal and the adc is running at 50ms/s. shou...
Analog IC Design & Layout :: 12 Apr 2006 3:46 :: lovseed :: Replies: 8 :: Views: 2598
a little problem about this matlab code
dear all,this is a part of sigma-delta modulator code in matlab. tr = 1024*4; % points for transient pt = 1024*32; % fft points tt = tr+pt; % total points osr = 64; % osr=64 fc = 20000; %...
Analog Circuit Design :: 09 Apr 2006 17:02 :: bob_lv :: Replies: 2 :: Views: 174
need help with adc
i am doing a pipeline adc modeling using simulink/matlab. i am getting the adc output plot. now i have written a code for inl/dnl (in a m-file). i want to pass on the output plot(basically the values) from simulink as input to the m-file. how can i d...
Analog Circuit Design :: 07 Apr 2006 5:54 :: suhas_shiv :: Replies: 4 :: Views: 360
matlab simulation question.
i want to make fourier trasnform to a continous signal and then plot the spectrum of this signal. does anyone know how can i do it.???? i tried to use the fft command for a simple function (sinx) but it gives wrong results. any help will be apprecia...
Digital communication :: 01 Apr 2006 2:42 :: davyzhu :: Replies: 8 :: Views: 513
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