131 Threads found on edaboard.com: Low Pass Filter In Matlab
i nned this,
Implement SSB AM signal from DSB signal without using low pass filter in matlab
can any one hep me...?
Digital Signal Processing :: 08.12.2010 12:08 :: myhumps007 :: Replies: 1 :: Views: 1059
Dear All I have this matlab code which convert the time to frequency domain but b4 this i want to add a low pass filter. can some one help me pls.
dt=1/fs;%% time interval
t=(1:length(x))*dt; %%time vector
df=1/(length(x)*dt); %% frequency interval
f=(1:length(X))*df;%% frequency (...)
Digital Signal Processing :: 24.05.2010 00:57 :: raaseth :: Replies: 6 :: Views: 16736
I have one problem.
I have a data vector. for example : data=rand(1,n) ; n=100;
I want to obtain discrete fourier transform of it by DCT command.
and then,by a low-pass filter,remove unwanted high frequencies of larger than f1.
f1 is determined.
and finally , again convert filtered data from discrete frequency domain to (...)
Mathematics and Physics :: 22.04.2013 12:01 :: ghasem_008 :: Replies: 0 :: Views: 627
I was asked to design a low pass filter that would attenuate the aliased frequencies by at least 60dB. I am using the fir1(n, wn) function. But no matter how I adjust the order n and corner/cutoff frequency wn, I can not make the attenuation less than 60dB, the highest point of the stop-band ripple is always around -52dB. The (...)
Digital Signal Processing :: 29.09.2005 14:45 :: triquent :: Replies: 4 :: Views: 3636
I have a signal vector and I wanted to low pass filter it. My knowledge of discrete filters is very limited so any help would be greatly appreciated.
My signal is basically a sampled instance of a sum of sinusoids of 100Hz and 1KHz. What I want to do is basically filter this sampled (...)
Digital Signal Processing :: 02.03.2010 14:28 :: aryajur :: Replies: 1 :: Views: 7792
I am triying to simulate fir low pass filter in vhdl test bench, I get square waves from matlab as txt document, and I use ip cores for filter which I produced in matlab in fdatool. I am using text-io in the testbech.
I have two questions
1-Square wave is 100Hz but in txt there (...)
PLD, SPLD, GAL, CPLD, FPGA Design :: 03.03.2013 10:14 :: vhdltestbench :: Replies: 0 :: Views: 442
I am designning a pal encoder now.I had learned that there should be a notch filter for luminance signal to aviod crosstalk with chrominance I designed a bandstop filter in matlab.But the attennulation of high frequency does not meet my porpose.Should I design a low pass (...)
Digital Signal Processing :: 24.11.2005 03:57 :: yesize :: Replies: 0 :: Views: 882
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/sample.
Then I inputted a discrete sine wave block(with (...)
Digital Signal Processing :: 29.11.2006 18:34 :: dav_mt :: Replies: 3 :: Views: 1598
hi, how to write matlab code for RC 1st order low pass filter??
i saw many matlab codes from internet , like butterworth, chebychev...
but don't have the one for RC low pass filter??
pls advice how to do it? i was stuck in RC filter (...)
Digital communication :: 24.12.2006 18:37 :: cmppolish2006 :: Replies: 0 :: Views: 3380
help me to simulate microstrip low pass filter using FDTD
with matlab program
Thanks for all
Electromagnetic Design and Simulation :: 28.08.2008 21:18 :: nafah :: Replies: 0 :: Views: 1013
I want to realize a simple analog low-pass first order filter in matl ab, but i waant also obtain time domain output if an input signal is present. So:
1)input time domain signal is realized with an array of values (i'm not using symbolic)
2)fft of input signal: i consider only frequencies equal and under fs/2 (with fs=sampling frequency) (...)
Digital Signal Processing :: 05.01.2009 09:27 :: lionelgreenstreet :: Replies: 0 :: Views: 1505
im the beginers in study of matlab...
can i know how can i use GUI to create the low pass filter..
with butterworth type and using bilinear method...
im stuck with this...
Digital Signal Processing :: 14.09.2009 21:43 :: awanis :: Replies: 5 :: Views: 1278
I need the program of a low pass filter for sinusoidal signal.
The signal is generated in matlab and a doppler(interference) is added to it now i need to remove the doppler using a low pass filter. This low pass filter (...)
Digital Signal Processing :: 03.04.2011 14:56 :: re_289 :: Replies: 1 :: Views: 570
Hi can anyone help me choose the best function in matlab to implement fir low pass filter given the following specs.
1. sampling frequency, Fs= ( 1.08332e6)
2. number of samples, N = 21.
3. passband ripple, Apass= 0.01dB.
4. Stopband ripple, Astop= 40dB.
Digital Signal Processing :: 11.08.2011 09:20 :: bjmoloi :: Replies: 2 :: Views: 365
I Need a Little Help of Designing FIR low pass filter Using Z Parameters matlab
I've searched and look for any information that would help to start doing such assignment. I was asked to design DSP processor - low pass filter using some blocks and parameters. (...)
Digital Signal Processing :: 23.01.2012 06:25 :: snikfreak :: Replies: 1 :: Views: 405
You can follow your LPF with an all-pass filter (or some other phase-compensating network) to adjust the phase.
Electronic Elementary Questions :: 03.07.2012 09:10 :: barry :: Replies: 4 :: Views: 1111
phase is defined as -arctan(w/wc), where w is frequency and wc is cut-off frequency. Whatever we have instead of w/wc, phase should not have the value lower than -90 deg.
Would be true only for a first order low-pass.
Analog Circuit Design :: 25.09.2012 05:59 :: FvM :: Replies: 4 :: Views: 576
I need a matlab code to
promt the user to enter a sinusoid signal
ex: x= 3*sin(2*pi*50*t) + 3*sin(2*pi*100*t) + 3*sin(2*pi*200*t) + 3*sin(2*pi*400*t)
and if any other variables are needed from the user.
then display the signal in time domain and frequency domain.
and then apply a low pass filter,
Digital Signal Processing :: 18.04.2013 10:00 :: Prosenjit101 :: Replies: 7 :: Views: 815
How to use matlab write a low_pass filter .. I can use simulink for
simulation , but I want to know how to write a matlab code..
simulink file can novert to matlab code or not ??
a low pass filter = 1/ (s+1) = e^(-t) (...)
PCB Routing Schematic Layout software and Simulation :: 16.12.2003 05:39 :: andy2000a :: Replies: 8 :: Views: 2511
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 in advance.
Analog Circuit Design :: 03.09.2005 00:32 :: avinash :: Replies: 6 :: Views: 2031
I am trying to design a low pass filter using butter filter in matlab I am confussed how to od this. If my carrier Fc is 20000,( but can be changed if needed) and Fs is 44100 (MP3 file) what do I put in the matlab function below? Please help me I can not get htis please??
Digital Signal Processing :: 05.12.2005 21:53 :: locchamp :: Replies: 3 :: Views: 7343
hi all ,
i am supposed to implement an Am modulator and demodulator using matlab
i have finished the modulator already
but i have a problems in the demodulator
i make an envelope detector ( i make it manually )
but then i want to make low pass filter and i don't know how
i know fir1() and (...)
Digital Signal Processing :: 08.12.2005 08:19 :: sherifelian :: Replies: 9 :: Views: 32023
I have some problems in the design of the low-pass filter in the QPSK receiver. How can I choose the sample frequence of the digital low-pass filter after the phase detecter. Following Nyquist criteria, if the passband of the (...)
Digital Signal Processing :: 16.05.2006 23:01 :: jerryjarod :: Replies: 1 :: Views: 665
how to design -a LPF(fir) by window method sampling freq=100hz and cut off=20khz..without using FFT builtin function.
plz can u give me a code(program) to implement this using matlab softwear.please.
Digital Signal Processing :: 01.02.2007 23:38 :: bharathchandra :: Replies: 2 :: Views: 4576
I am using fdatool, but the parameters are from 0.1 to 0.9 or something like that,
how do I translate a 4khz low pass filter into these coordinates.
Digital Signal Processing :: 20.02.2007 00:49 :: mehboob_iiui :: Replies: 7 :: Views: 1127
can anyone provide me with the code or implementation ideas for low pass filter of particular cut-off frequency and notch filter without using inbuilt functions on matlab ...
thanks in advance ...
Digital communication :: 26.03.2007 05:20 :: rmreddy :: Replies: 2 :: Views: 1905
could you guys please give me an explanation why if I low pass filter an upsampled (zero stuffed) ramp signal I get some oscillation which increases in amplitude with time?
The time frame that I am looking is very big in comparison to the response length of the filter, in other words, I am NOT seeing just the (...)
Digital Signal Processing :: 20.11.2007 11:50 :: Arturi :: Replies: 0 :: Views: 880
Hello sir. this is vijay form India,I am working with FDTD lumerical software. i have some errors in this design of filters. so, i need a soft copy of all filter(Bandpass , low pass, High pass, Band stop) designs. As the frequency range of 10 GHZ . so kindly help me as soon as possible. (...)
Digital Signal Processing :: 19.09.2010 10:29 :: VIJAY916 :: Replies: 2 :: Views: 1819
i am doing the final year project about class D amplfier , use some algorithm to produce PWM , then pass to the power amplifier and low pass filter to generate sound.
Since i finish to build the class D amplifier in fypga and also able to see the Power spectral of the generated PWM to measure the THD of the board. The (...)
Electronic Elementary Questions :: 15.03.2008 01:00 :: clarken :: Replies: 3 :: Views: 2274
i am receiving data from a 2-D digital accelerometer..i am provided with a software that reads the accelerometer signal form parallel port and samples it at the chosen sampling rate .....and writes the tab separated text file .....file contains three columns: time,x,y....
after taking this file,i want to apply low pass filter on (...)
Digital Signal Processing :: 12.04.2008 03:05 :: roop123 :: Replies: 3 :: Views: 901
in one symbol period,if there is no zero-crossing point,what should I do?according to the gardner algorithm,in one symbol period,we should haver two zero-crossing I right?
Nothing. PLL low-pass filter will do if you once have no zero-crossing.
Positive and negative zero-crossings will be accumulated by low-pa
Digital Signal Processing :: 25.05.2008 03:27 :: fontp :: Replies: 6 :: Views: 4286
I want to generate a slowly changing signal (1 second duruation).
For this, I must filter white noise with a filter which is characterized by an alpha function as below
alpha(t)= t*exp(-t/tau) ( I think function is low-pass filter response)
where tau=3 (...)
Digital Signal Processing :: 06.07.2008 15:40 :: sarahpaninsky :: Replies: 0 :: Views: 1408
I have to do a SSB modulation in matlab ...
the probem is I don't know how to use matlab ..!!!!
I found a SSB modulation but i wanna edit it to satcify my assignment rquirments...
1) read the wave file.
2) choose proper sampling rate for the high-frequency simulation.
3) generate ni and nq with their proper sampling rate.
Digital Signal Processing :: 03.02.2009 16:02 :: gsa_alsaher :: Replies: 4 :: Views: 4299
I have an i/p signal x = 1 +0.5* sin(pi*t) where t = , basically a signal sampled at 100 Hz. I need to filter out the d.c. component i.e. get 1 as a constant output so for which I have to design a low pass filter.
can any one tel me how to design low pass (...)
Digital Signal Processing :: 16.02.2009 03:07 :: rramya :: Replies: 2 :: Views: 672
required matlab code for low pass filtering of a digital sequence
i want how to found the value of this every elemnt in it after passing through low pass filter i requesting matlab code for it
Digital Signal Processing :: 24.03.2009 15:22 :: sayurabh :: Replies: 1 :: Views: 2462
I wish to implement a discrete High-pass-filter (HPF) in matlab/Simulink. I found a discrete low-pass-filter (LPF) in one of the Simulink examples as z
fc: cut-off frequency
Tsc: sampling period
Electronic Elementary Questions :: 09.05.2009 13:15 :: powersys :: Replies: 2 :: Views: 7362
Hello, I'm a beginner to DSP and matlab. I have to design a filter in matlab. Please refer to the question below. Can anyone please help me with the design codes? Thanks.
Design a 50th order FIR low pass, high pass, band pass and band stop (...)
Digital Signal Processing :: 06.10.2009 00:46 :: AnshuDalvi :: Replies: 0 :: Views: 1492
I have written a code which emulates a qpsk tx n rx system. it works perfectly and i'm getting the BER curve exactly.
As my next task i have been asked to design an fir low pass filter through which i am to pass the qpsk signal. i'm not getting much assistance from the guide and i'm pretty much on my own. I would (...)
Digital Signal Processing :: 29.01.2010 06:00 :: shubhs9 :: Replies: 5 :: Views: 4749
What exactly is wrong? As far as I can tell, you don't have a "canonical" two pole low-pass filter because your transfer function has a pole at zero, another pole and a zero.
Digital Signal Processing :: 18.02.2010 14:32 :: Emanuel_hr :: Replies: 1 :: Views: 1752
You can do it in two ways.
Way1: Just pass the signal through a highpass filter. (This will remve the DC),
Use fadtool to design very constrained filter.
Way2: (Normally high pass filter is not advisable)
Step1: You need to implement a low (...)
Digital Signal Processing :: 28.06.2010 14:52 :: alaparthi :: Replies: 3 :: Views: 1508
Not really digital but since it'a a Simulink question I thought it fitted best in here...
I have a very basic frequency modulation system in Simulink, consting of a sine wave input, FM modulator passband block, FM demodulator passband block and a scope. When executing the simulation you can see that the modulating and demodulated signal don't ex
Digital communication :: 17.11.2010 14:12 :: rvdp :: Replies: 0 :: Views: 846
alz help me in doing this problem..............
"Make an m-file to low pass filter a signal x(t) consisting of two
cosines at 5 and 20 rad/s using an RC LPF. Choose suitable values of R
and C to allow the cosine at 5 rad/s to pass through and suppress
(filter out) the cosine at 20 rad/s. (...)
Miscellaneous Engineering :: 06.03.2011 08:52 :: umair_ae :: Replies: 0 :: Views: 1319
Use the followings for your wave audio file:
>>=wavread('your_file_name.wav'); /* read file into memory */
>>sound(wave,fs); /* see what it sounds like */
>>t=0:1/fs:(length(wave)-1)/fs; /* and get sampling frequenc
Digital Signal Processing :: 08.03.2011 06:59 :: Antonio10 :: Replies: 6 :: Views: 15116
Hi guys , i need some advice/tips/guidance. Pls share.
So , i am supose to design a low pass filter with a certain cutoff frequency
and i'm suppose to filter those high frequency component of the sound in time domain(convolution) and freq domain(multiplication).
So , i am not sure how to do it..i took a snippet from (...)
Digital Signal Processing :: 12.03.2011 06:46 :: microelectronics :: Replies: 0 :: Views: 490
I am currently working on a wireless pulse-oximeter as my final year project. we are having some trouble in the digital signal processing part particularly in the implementation of different filters in C. we are using TI's MSP430 for the project. We have implemented DC tracking filter in matlab but dont know how to translate it in C. (...)
Software Problems, Hints and Reviews :: 26.04.2011 08:13 :: Zara Ahmad :: Replies: 0 :: Views: 1777
i design 10th order analog low pass chebyshev filter & i want to plot its group delay versus frequency. i've already plotted using bode command , the phase & mag. response & i know that the group delay is the negative of the derivative of the phase of transfer function but how can i plot the group delay on matlab ?? (...)
Analog Circuit Design :: 01.06.2011 13:30 :: Heidi.Eissa :: Replies: 0 :: Views: 1109
i need matlab program coding to design low pass filters.
Power Electronics :: 04.09.2012 08:50 :: ruchiagarwal :: Replies: 0 :: Views: 183
I'm pretty sure I'm screwing this up pretty badly due to my limited understanding of matlab but I am trying my best. A passive low pass filter was assembled and measured the output via an o-scope. At each frequency from the signal generator we wrote down the input/ouput Vpp. Using that data I am trying to (...)
RF, Microwave, Antennas and Optics :: 20.09.2012 21:48 :: chart2006 :: Replies: 2 :: Views: 2697
I m working on analysis of EEG signal. For that purpose i need low pass filtering of EEG using butterwoth filter in matlab. filtering frequency range is 0-64 Hz. i cant understand which command is needed to use and how to use . please help if anybody knows.
Digital Signal Processing :: 21.02.2013 01:15 :: Riheen :: Replies: 0 :: Views: 253
so what should be the cut off frequency of anti-aliasing low pass
Do you use matlab
If yes, just type "fdatool" in command line.
Then in the opened window of FDATool set the parameters:
Fs = 2500
and Fstop you may choose any value between 1000 and Fs/2. But Fpass
Digital Signal Processing :: 15.04.2013 02:58 :: Mityan :: Replies: 4 :: Views: 366