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mtalab magnitude/frequency spectrum viewer
i am newbie to matlab.i have vector of digital samples ,i need to psd-plot the samples continiously playing like movie with given baseband frequency . i can plot samples using plot(abs(vector)) ...
Digital Signal Processing :: 07 Nov 2009 2:13 :: rohit2600 :: Replies: 0 :: Views: 33
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 sinew...
Analog IC Design & Layout :: 04 Nov 2009 2:34 :: euniceliu :: Replies: 6 :: Views: 3192
matlab code for rayleigh fading channel
can some one help me with matlab code for rayleigh fading channel .thank you...
Digital communication :: 27 Oct 2009 22:57 :: thewinner :: Replies: 4 :: Views: 2661
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 re...
Electronic Elementary Questions :: 26 Oct 2009 11:30 :: chanphat01001 :: Replies: 25 :: Views: 18192
how to change matlab command
hello everybody...can i ask something...how ca i change this command to display the magnitude spectrum??this command has show low pass filter.. case 1 if(wp>ws) handle=errordlg(wp ...
Digital Signal Processing :: 14 Oct 2009 1:17 :: awanis :: Replies: 0 :: Views: 99
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...
Digital Signal Processing :: 28 Sep 2009 18:57 :: Aya2002 :: Replies: 12 :: Views: 2039
how to use aditional mean value in fft matlab????please help
e!!!!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 s...
Digital Signal Processing :: 27 Sep 2009 13:19 :: program2 :: Replies: 0 :: Views: 129
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: 429
ofdm with qpsk (matlab simulation code required)
hi,can i get a matlab simulation code for ofdm implementing qpsk modulation..its urgent plz,,,,...
Digital communication :: 24 Sep 2009 9:51 :: puripong :: Replies: 6 :: Views: 1338
need help to implement this matlab code to calculate sfdr..
ert a .mat file into .dat file..thy in advanced%-------------------------------------------------%%%matlab code to calculate snr,sndr,thd sfdr%%date : 11 july 2005%%rev : 1%---------------------------...
Analog IC Design & Layout :: 21 Sep 2009 15:39 :: kickbeer :: Replies: 2 :: Views: 390
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 link...
Digital Signal Processing :: 11 Sep 2009 17:07 :: Communications_Engineer :: Replies: 4 :: Views: 527
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: 639
need matlab code or codes able to simulate ofdm
fdm and its applications for my work . to understand ofdm more and more, i want to simulate it with matlab. if it is possible, could you supply me a matlab code or codes which are able to simulate ofd...
Digital communication :: 16 Aug 2009 22:29 :: hozy :: Replies: 0 :: Views: 189
few clarification on snr/sndr calculation
he proper method of dealing sample data ffts)now i want to calculate the snr/sndr and i want to use matlab. i have following confusion.(i save the fft in .csv file)1.as my data output is from sample a...
Analog Circuit Design :: 11 Aug 2009 23:58 :: rmiguel :: Replies: 3 :: Views: 480
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 t...
Digital Signal Processing :: 06 Aug 2009 9:48 :: Petre Petrov :: Replies: 7 :: Views: 773
output spectrum components of a pulse width modulated signal
ince the output of a pwm will have inifinte frequency components, how do we measure its spectrum in matlab. what type of window must be used? any references will be very helpful....
Digital Signal Processing :: 29 Jul 2009 10:08 :: MiW :: Replies: 1 :: Views: 183
psoc in wireless sensor node
hi all, i am a new designer in psoc.i want to design a wireless node that contains analog input signal connected to psoc microcontroller which should connected by serial max 232 with a wi-fi modulator...
PLD, SPLD, GAL, CPLD, FPGA Design :: 28 Jul 2009 19:14 :: PSOCExpert :: Replies: 4 :: Views: 456
reading wav file into matlab with wavread;frequency spectrum
hi,i want to read a wav file into matlab using wavread. i then want to be able to output the frequency spectrum, i.e plot of db vs frequency. if i know the sensitivity of the mic i used to record the ...
Digital Signal Processing :: 22 Jul 2009 11:39 :: macgabhr :: Replies: 0 :: Views: 192
need matlab help!!
can anybody help me in making bandpass filter which will pass frequencies between 925 to 970 mhz , and after that pass a square wave in this filter and then check the output frequencies(using fft) an...
Digital Signal Processing :: 30 Apr 2009 13:36 :: bt87 :: Replies: 13 :: Views: 891
real dft and complex dft in matlab
mber coming across this distinction while at university. i want to play around with a few things in matlab now, but as i understand it the fft() and ifft() functions in matlab implement the “complex d...
Digital Signal Processing :: 28 Apr 2009 23:11 :: diaks :: Replies: 8 :: Views: 2724
help plzz am running out of time
ion research,am having a real huge problems and i really need ur help,my first problem is am new to matlab,am using matlaab simulink n am trying to input a sine wave n see its frequency spectrum by us...
Digital Signal Processing :: 14 Apr 2009 21:12 :: battousai_47 :: Replies: 4 :: Views: 453
matlab simulink - sine wave frequency spectrum problem
n research, am having a real huge problems and i really need ur help, my first problem is am new to matlab, am using matlaab simulink n am trying to input a sine wave n see its frequency spectrum by u...
Embedded Systems and Real-Time OS :: 09 Apr 2009 10:23 :: sau_sol :: Replies: 2 :: Views: 318
matlab truth
ing 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(fft(fn))...
Digital Signal Processing :: 14 Mar 2009 21:08 :: Aya2002 :: Replies: 5 :: Views: 1383
help needed about matlab's windowed fft precision!!
h the discrete fourier transform, f. j. harris, proceedings of the ieee vol.66 no.1, jan. 1978 the matlab script i used (im using matlab r2006b):close all;nbpts=1024;w=hann(nbpts); % generates hann...
Digital Signal Processing :: 10 Mar 2009 8:14 :: rramya :: Replies: 12 :: Views: 819
spectrum analysis with the fft basics and matlab 4 begineers
re 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 on...
Digital Signal Processing :: 09 Mar 2009 21:25 :: ILv2Xlr8 :: Replies: 12 :: Views: 2382
help!!! precise spectrum analysis using matlab
i need to get the precise spectrum component of the signal i generated in matlab simulink. the code i use now is shown asfs = 2e6; % sampling frequencyt = 1/fs; ...
Digital Signal Processing :: 07 Mar 2009 7:58 :: rramya :: Replies: 1 :: Views: 471
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 atten...
Digital Signal Processing :: 02 Mar 2009 10:25 :: Communications_Engineer :: Replies: 61 :: Views: 12580
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: 534
sound card as analog-to-digital converter
nic circuit.did anyone know a good pc program for data acquisition using the sound card? (vb , c++, matlab etc....)thanks...
Digital Signal Processing :: 18 Jan 2009 1:58 :: eng_shady00 :: Replies: 2 :: Views: 402
experts of lecroy scope, fft, and matlab... pls assist!
on) 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 the scope. im quite sure the algorithm use...
Electronic Elementary Questions :: 06 Jan 2009 9:45 :: powersys :: Replies: 7 :: Views: 1083
how to obtain power spectrum from eeg raw data
to the number of channels used for the daq. sampling frequency is 256hz.can anyone share any simple matlab codes to obtain power spectrums just for the start? or maybe any links which i can refer to? ...
Digital Signal Processing :: 20 Sep 2008 9:55 :: manish12 :: Replies: 3 :: Views: 317
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??...
Software Problems, Hints and Reviews :: 05 Jul 2008 5:50 :: kender :: Replies: 7 :: Views: 564
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.tha...
Digital Signal Processing :: 07 May 2008 5:40 :: akrcal :: Replies: 5 :: Views: 897
plotting frequncy plot reading values from excel file
elpful for reading from excel file and selecting perticular column also.time = xlsread(d:\installed\matlab\work\tone.xls,-1);%num;inp = xlsread(d:\installed\matlab\work\tone.xls,-1);%inp;outp= xlsread...
Software Problems, Hints and Reviews :: 24 Feb 2008 14:34 :: dspman :: Replies: 1 :: Views: 296
matlab quries ?
the voice security .for that i use spectrum inversion .i want to know that , is there any mixer in matlab toolbox for getting the frequency inversion ,for ex :- mic -> mixer > 4 bands > select the de...
PC Programming and Interfacing :: 06 Feb 2008 14:33 :: manish12 :: Replies: 0 :: Views: 133
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: 428
job openings for mems design engineers at sws
ition and electro-mechanical design. • familiar with mems cad tools (eg. memspro, coventor, ansys & matlab)• hands-on experience in micromachining fabrication process technology is a plus.• measuremen...
EDA Jobs, Promotions, Advertising :: 27 Jan 2008 8:05 :: mosmed :: Replies: 0 :: Views: 741
spread spectrum clock generation
hello,im currently working with an electronic product that utilizes sscg (spread spectrum clock generation).can someone explain the concept of this technology. i have a shallow understanding with thi...
Analog Circuit Design :: 26 Jan 2008 3:12 :: CaPsLoCkE :: Replies: 6 :: Views: 335
cyclic spectral estimator (matlab)
se two values?? i have searched a lot of forums, boards and mailing lists and i am unable to find a matlab code to estimate the cyclic cross autocorrelation nor the cyclic cross spectrum of noisy sign...
Digital communication :: 08 Jan 2008 16:05 :: AARTHIREDDY :: Replies: 2 :: Views: 573
help me to analyse spectrum of discrete signal in matlab
f(sample) =40hz.and my problem is how i can analyse spectrum of those 200 pieces discrete signal in matlab.plz help me some code matlab or tell me which macro in matlab can do it.thank you very much...
Electronic Elementary Questions :: 18 Dec 2007 6:41 :: cesare :: Replies: 4 :: Views: 235
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 signa...
Digital Signal Processing :: 01 Dec 2007 18:41 :: ednan :: Replies: 6 :: Views: 264
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-efficien...
Software Problems, Hints and Reviews :: 09 Nov 2007 16:58 :: pokyeah85 :: Replies: 0 :: Views: 123
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...
Analog Circuit Design :: 01 Oct 2007 12:04 :: sankudey :: Replies: 10 :: Views: 759
projects on dsp applications
i need some topics that are related to projects on dsp applications...
Digital Signal Processing :: 03 Sep 2007 10:58 :: t.m.keerthi :: Replies: 13 :: Views: 1566
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 f...
Digital Signal Processing :: 29 Aug 2007 3:01 :: brmadhukar :: Replies: 2 :: Views: 162
heterodyne signal processing
um and get a faster readout. i would also need to vary some other parameters for the experiment.any matlab code for this?really thanks for ya help!...
Electronic Elementary Questions :: 23 Aug 2007 14:37 :: watertreader :: Replies: 0 :: Views: 159
help me in matlab code ...
t 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 plane) 3) why we need absolute of the...
Digital Signal Processing :: 07 Aug 2007 7:58 :: vjfaisal :: Replies: 5 :: Views: 210
modulation recognition algorithm
hi, can anyone proivide me with any algorithm that can detect modulation scheme of a signal in matlab...
Digital Signal Processing :: 01 Aug 2007 15:22 :: bulx :: Replies: 3 :: Views: 324
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...
Digital Signal Processing :: 28 Jul 2007 21:28 :: Dmitrij :: Replies: 3 :: Views: 402
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 th...
Analog Circuit Design :: 18 Jul 2007 16:00 :: hmsheng :: Replies: 0 :: Views: 267
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 ...
RF, Microwave, Antennas and Optics :: 15 Jul 2007 2:14 :: echo47 :: Replies: 5 :: Views: 306
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 ...
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: 7953
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...
Digital Signal Processing :: 02 Jul 2007 6:05 :: echo47 :: Replies: 16 :: Views: 441
help with calculation of ifft in matlab
hii,im generating a text file in labview which contains the real and imaginary parts of intensity of a signal and i wish to calculate its ifft and come in time domain.i have 201 points in the frequenc...
Digital Signal Processing :: 26 Jun 2007 5:36 :: echo47 :: Replies: 1 :: Views: 579
find the frequency spectrum before and after sampling
frequency spectrum. help me find the frequency spectrum before and after sampling. how to do it in matlab? i am interested in frequencies from 0~integer*sampling frequency. i want to see how differen...
Digital Signal Processing :: 18 Jun 2007 3:10 :: Sal :: Replies: 1 :: Views: 180
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...
Analog Circuit Design :: 01 Jun 2007 9:42 :: geethki :: Replies: 4 :: Views: 750
dsp problem - help
t3.) extend the filter routine to allow for recursive filters.4.) compute filter coefficients using matlab filter tool fdatool. design two filters of order 10: a) fir linear phase using a hamming ...
Digital Signal Processing :: 17 May 2007 10:46 :: snoopfan :: Replies: 0 :: Views: 258
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...
Digital Signal Processing :: 27 Feb 2007 16:18 :: ricksidd :: Replies: 3 :: Views: 258
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 sig...
Digital Signal Processing :: 19 Feb 2007 14:48 :: Sal :: Replies: 1 :: Views: 120
quantization
aoa to all!i want to read a sound file in matlab, and set the sampling frequency to 8k. and represent each sample in 8-bits. play the result and also plot the frequency spectrum. i expect the spectrum...
Digital Signal Processing :: 25 Jan 2007 12:52 :: rsrinivas :: Replies: 2 :: Views: 195
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 noti...
Electromagnetic Design and Simulation :: 23 Dec 2006 1:16 :: yaswanthr :: Replies: 4 :: Views: 1125
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 con...
Digital Signal Processing :: 08 Dec 2006 10:44 :: Drago :: Replies: 15 :: Views: 402
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 d...
Digital communication :: 04 Dec 2006 16:20 :: magnetra :: Replies: 4 :: Views: 303
fir filter in matlab
i just designed an fir filter in matlab, and saw the impulse response. i obtained a low pass filter. up to now there were no problems. i read the cut-off frequency(0.144cycles/sample) and had 2 null f...
Digital Signal Processing :: 01 Dec 2006 8:45 :: Robinenemy :: Replies: 3 :: Views: 261
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: 1797
dsp sampling theorem matlab questions
of samples(through simulation time) has such a drastic effect? to transform into frequency domain, matlabs fft function is used. ive tried to check out doc fft to see wheter the number of samples hav...
Digital Signal Processing :: 08 Nov 2006 5:49 :: bcl :: Replies: 4 :: Views: 930
psd calculation using matlab{help needed}
im writing a matlab m-file to calculate psd of sinusoid signal.however the output puzzle me a lot.below is the m-file: ------------------------------------------------------------------fs =1e10;fi =1...
Digital Signal Processing :: 20 Oct 2006 23:14 :: lassmat :: Replies: 1 :: Views: 2028
finding the frequency response of a quantized filter!!!!!!!
hi folks i have designed a bandpass filter and quantized it.(16bit input,16 bit coefficients and 16 bit output data-cd quality). now i need to verify the filter response on how much it is deviating ...
Digital Signal Processing :: 13 Oct 2006 9:12 :: wwfhm2002 :: Replies: 1 :: Views: 138
snr
hello,now, i am designing a delta-sigma dac. but dont know how to simulate the performance of the delta-sigma modulator like snr....
Digital Signal Processing :: 01 Jun 2006 9:04 :: feel_on_on :: Replies: 5 :: Views: 495
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