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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
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 should be from 0 to 4khz. plz tell me how to do a...
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 noticed extremely. to calculate dispersion diagrams by...
Electromagnetic Design and Simulation :: 23 Dec 2006 1:16 :: yaswanthr :: Replies: 4 :: Views: 1143
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: 321
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 frequencies at 0.325cycles/sample and 0.5cycles/sam...
Digital Signal Processing :: 01 Dec 2006 8:45 :: Robinenemy :: Replies: 3 :: Views: 270
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: 1860
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
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 =1e8;amp =1;nbpts =4e5;t =;sig =amp*sin(2*pi*fi*t);h...
Digital Signal Processing :: 20 Oct 2006 23:14 :: lassmat :: Replies: 1 :: Views: 2100
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 from the unquantized response. can i feed in a noi...
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: 504
sampling frequency offset in ofdm
hi everybidy,i have simulated a code in matlab for the demodulation of ofdm signal (dab). in the synchronisation process, i found the clock offset of 13.035 khz in the spectrum after downconversion. i used a nco to remove the frequency offset. now wh...
Digital Signal Processing :: 12 May 2006 8:45 :: shameem :: Replies: 0 :: Views: 261
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: 2592
sigma delta modulator: verilog code to matlab?
hi guys,i have a serious problem.i have verilog code for a third order delta sigma modulator but donot have its simulink model.how can i get the frequency domain characteristics of the modulator such as the stf,ntf and output spectrum? verilog has on...
Analog Circuit Design :: 10 Apr 2006 5:05 :: bob_lv :: Replies: 6 :: Views: 999
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
frequency spectrum in matlab
hi all,im still rather new to matlab and have certain questions to ask. is it possible to generate a signal at a specific frequency? and is it possible to control the power spectral density of the signal?...
Digital communication :: 13 Mar 2006 21:12 :: xischaune :: Replies: 3 :: Views: 441
square wave using simple harmonics
hello, i need some help on this problem. a square wave has an amplitude of 10 and a fundamental frequency of 50 hz. first, plot the frequency spectrum of this wave. use matlab or excel to construct the wave usind the cosines that form its basis. to s...
Mathematics & Physics :: 07 Mar 2006 23:11 :: Blimpy325 :: Replies: 0 :: Views: 210
inverse fft and impulse response with matlab
i have a measured truncated spectrum and i want to know the corresponding impulse response. how should i do?i padded the data with zeros and created the complex symmetric spectrum from these data to have a real signal when applying the ifft. but. res...
Digital Signal Processing :: 07 Feb 2006 12:31 :: MSGHP :: Replies: 3 :: Views: 426
fft scale
how do i scale the results of my fft to obtain a magnitude vs. frequency plot?...
PC Programming and Interfacing :: 16 Nov 2005 9:37 :: echo47 :: Replies: 13 :: Views: 4500
sigma-delta modulator issues
1) many sigma-delta modulators simulink models include some gain blocks, whose gain value may be 0.5/1.0/2.0. how to decide whether the gain block is needed and how to decide these gain values?p.s., the pic (sdm.jpg) is an example. the a1(a2,b1,b2,b3...
Analog Circuit Design :: 10 Nov 2005 3:24 :: sunking :: Replies: 3 :: Views: 489
sigma-delta modulator issues
1) many sigma-delta modulators simulink models include some gain blocks, whose gain value may be 0.5/1.0/2.0. how to decide whether the gain block is needed and how to decide these gain values? p.s., the pic (sdm.jpg) is an example. the a1(a2,b1,b2,b...
RF, Microwave, Antennas and Optics :: 09 Nov 2005 12:31 :: trashbox :: Replies: 0 :: Views: 99
how to using fft to study the power spectrum?
hello:i have struggled for days on this problem: i have a sequency of time points. assume they are correponding to the zero-cross time points of a sine-likewaveform. from this wave, i can approximately re-construct some sample points by assuming a si...
Digital Signal Processing :: 04 Nov 2005 13:29 :: neoflash :: Replies: 8 :: Views: 693
matlab embeded psd function
= 0:1/fs:.296;x = cos(2*pi*t*200); h = spectrum.welch; % instantiate a welch object. psd(h,x,fs,fs); % plot the one-sided psd.folks:i am curious about above example in matlab. i run this example and found that the psd ...
Mathematics & Physics :: 16 Oct 2005 14:49 :: echo47 :: Replies: 4 :: Views: 7104
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matlab demo running error, help debug please
there is a matlab demo in help file on psd.fs = 1000; % sampling frequencyt = (0:fs)/fs; % one second worth of samplesxn = sin(2*pi*50*t);hs = spectrum.periodogram(hamming);psd(hs,xn,fs,fs,nfft,1024,spectrumtype,twoside)however, durin...
Digital Signal Processing :: 16 Oct 2005 11:52 :: mro83 :: Replies: 3 :: Views: 273
help check what's wrong?
input signal x consists of 3 cosine waves with f1=8hz, f2=32hz f3=128hz, x=cos(2 pi f1 t)+cos(2 pi f2 t)+cos(2 pi f3 t), sampling rate fs=2048samples/sec. the input signal need to pass a multi-rate system that works as a decimator. the decimator redu...
Digital Signal Processing :: 07 Oct 2005 3:00 :: triquent :: Replies: 2 :: Views: 174
how to plot the signal in frequency domain by matlab?
for signal y=cos(2*pi*f1*t)+cos(2*pi*f2*t)+cos(2*pi*f3*t), f1=8hz, f2=32hz, f3=128hz, how to plot the signal in frequency domain using matlab? i know how to plot it in time domain? but for frequency domain, should i just plot the 6 one samples at the...
Digital Signal Processing :: 29 Sep 2005 9:34 :: Circuit_seller :: Replies: 10 :: Views: 2355
snr of sigma delta modulator
i have the simulated bitstream output of 16-bit sigma delta modulator.nor i want to check the snr of the same by passing the bitstreams through a ideal low pass filter in matlab.can anyone tell me the commands of the matlab toi measure the snr.thanks...
Analog Circuit Design :: 06 Sep 2005 6:16 :: avinash :: Replies: 6 :: Views: 543
generating random noise in matlab
hi to all i have an acoustic project an i shoud generate a noise-like signal in mtlab based on astm e1050 standard. the noise specification is :it is recommended that the test signalconsist of broadband random noise; however, other testsignals such a...
Digital Signal Processing :: 03 Aug 2005 9:14 :: mro83 :: Replies: 7 :: Views: 4386
image processing + matlab + wavelet transforms..good combi ?
hi pals ...i m trying to compress the bmp image to jpeg standards using wavelet transforms .. can anyone suggest me how to proceed ??i also wanted to find in which portion of the image i have the maximum information .. thanks in advance...
Digital Signal Processing :: 01 Aug 2005 11:44 :: swahlah :: Replies: 4 :: Views: 471
matlab coding for graph
here is my problemlet say i want to plot function y=sinx. (this is just for example, of course the real case is much more complicated)so in matlab i write plot y.and now i want to have the period of the graph. (we know in this case the period is 2 pi...
PC Programming and Interfacing :: 27 Jul 2005 6:13 :: checkmate :: Replies: 4 :: Views: 330
question about network analyzer-pc interfacing using gpib
hi everyone, i would like to develope a program to download the frequency response of a filter (passband: 890-915mhz and 935-960mhz) from a hp8753d/e network analyzer to a pc via gpib, and then generate the time domain response in the pc using ifft....
RF, Microwave, Antennas and Optics :: 22 Jul 2005 20:53 :: sergio mariotti :: Replies: 1 :: Views: 357
about sndr in pipelined adc
the adc is 10bit 80ms/s,how can i use fft to get the sndr ?should i have to do the fft in d0 d1 d2 ~~d9??the input is a full-scale sinewave....
Analog Circuit Design :: 11 Jul 2005 6:43 :: avinash :: Replies: 8 :: Views: 1098
fft question
i have a matlab question.my input is a 1mhz sine wave and my clk is 80mhz.when i do fft about sfdr,my peak value is not in 1mhz in fft picture.can you tell me detail if you know.thank you.my input is out1.txt001010101000101010101010101000101010100...
Analog Circuit Design :: 18 Jun 2005 22:45 :: jacobliu :: Replies: 5 :: Views: 1380
solve this matlab problem **help me**
osed of four numbers. each number is equivalent to the its corresponding major examination. make sure that all the plots have labels on each axis and a title. use xlabe, ylabel and title. place your matlab commands on the answer sheet .1. (prelim (1...
Digital Signal Processing :: 12 Mar 2005 3:08 :: glenjoy :: Replies: 0 :: Views: 462
frequency vs magnitude spectrum from fft theoritically
hai,i have a full-wave rectified dc signal at 0.5hz. as per nyquest theoram i sampled at 2*0.5=1hz. i took 4 samples x(1)=0,x(2)=5,x(3)=0,x(4)=5 sampled at 1sec. theoritically, if i calulate the fft x(ωk)=x(ω),x(2ω),x(3ω),x(4`...
Electronic Elementary Questions :: 08 Mar 2005 16:19 :: cedance :: Replies: 5 :: Views: 1827
nyquist theorem
assalam o alekum !plz give detailed answeris nyquist theorem i.e.sampling frequency shud be greater than max component of freqalso true for fiber optics or only for copper wire.thankx...
Electronic Elementary Questions :: 01 Dec 2004 17:57 :: Cluricaun :: Replies: 16 :: Views: 2424
multipath fading matlab code required
if any body have multipath fading matlab codeand there category specification (a,b,c) for wireless channelplease send it urgently or suggest any link...
Digital Signal Processing :: 18 Oct 2004 14:55 :: ssiva :: Replies: 3 :: Views: 690
array waveguide grating
currently i am doing research in awg(array waveguide grating) and i am facing a problem on the transfer function of the awg as i got a pulse shape act like a multiple filter, and i dont know whether is it correct or not.secondly is i am facing proble...
RF, Microwave, Antennas and Optics :: 18 Oct 2004 8:12 :: RO :: Replies: 0 :: Views: 282
matlab algorithm and power spectrum
hello. i have some problem here and either my knowledge is not enough or something i cant figure out is wrong. its pretty simple i suppose.i enter in matlab the signal x=sin(2*pi*1000*t)+0.05*sin(2*pi*1e5*t)where t=1:1e-8:0.002; and try to estimate t...
Digital Signal Processing :: 13 Aug 2004 12:51 :: zorro :: Replies: 8 :: Views: 843
a question about aic23.
hii have a tms320c6416dsk which has a aic23 codec on it. i want to know can i apply a 12khz signal to it?i have read the data sheet, in the data sheet specified that a digital filter will filter digital sampling data ( as shown in below). i want to k...
Digital Signal Processing :: 30 Jun 2004 8:39 :: dora :: Replies: 5 :: Views: 972
how can i use matlab to aid to do a fpga simulation?
i want to use matlab to general the test bench code or some complex signal wave file, the simulator, for example, alteras quartusii or xilinxs ise(in fact modelsim) then use the wave file to simulate. the simulation result can be send to matlab to ...
PLD, SPLD, GAL, CPLD, FPGA Design :: 07 May 2004 16:14 :: ddt694 :: Replies: 8 :: Views: 645
rf microwave tools - part 5 ( phase-locked loop designer)
phase-locked loop designerhttp://rf.rfglobalnet.com/downloads/pll.zip...
RF, Microwave, Antennas and Optics :: 08 Dec 2001 1:56 :: BigBoss :: Replies: 3 :: Views: 7992
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