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# Lpf In Matlab

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52 Threads found on edaboard.com: Lpf In Matlab

## Need to design LPF in Matlab using Butter

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?? I need to filter: outfm = Ac * cos(wc.*t + 2 * pi * kf * cumsum(snd)); Fc

## how to design LPF in matlab

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. Plot the spectrum of the input and output signals, as we

## Help me with mixing the Tx and Rx signal then LPF in Matlab

Hi, Iam trying to do some analysis for a redar system that uses Linear Chirp modulation. I have a problem mixing the Tx and Rx signal then lpf. RX is a delayed version of the Tx. Normally after mixing (muliplying Tx and Rx) i dont get the low freq part!!! I tried matlab Help but i cannot get it! Any help Please?

## How to implement DDC in Matlab?

for example in a communications system the the signal band may only be narrow, KHz wide, but the signal band could be centered at RF frequencies, at many MHz. If the signal is sampled according to the Nyquist criterea, i.e. twice the highest frequency, then the data rate for the RF signal will be very high. Processing the data at this high rate is

## Please .. I need professionals in Matlab Filtering methods

I designed a circuit to detect the ecg signal. I applied it to pc through the mic. input, then i applied it to matlab using the wavrecord function. I can select my sampling rate and the number of samples to record. Now,first i want to plot the signal against time. Can this be acheived by just the plot command, or i need to create a time vector.

## How to implement High-Pass-Filter (HPF) in Matlab/Simulink?

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 Denominator: z-exp(-2*pi*fc*Tsc) fc: cut-off frequency Tsc: sampling period Could some

## low pass filter (matlab)

Hi the best way is to read matlab help. see the matlab entries for commands: "butter" that u can set it as a lpf . "filter". a glance will guide u through.

Hi. I agree with others. If you do the D/A conversion in matlab so you should not use lpf. But I just want to mention a few things: If fs is samplinf freq and fin is input frequency: fin = (N/M) * fs and GSD(M,N) = 1 in this case you don't have to use windowing and then get FFT. You just get FFT, halve it, find the main bin and the rest is noi

## Let's talk about the transceiver in WLAN

We will design a transceiver in WLAN we should simulate the system architecture in matlab or ADS at first to evaluate the parameters of the all blocks(LNA,MIXER,lpf,etc),such as gain,p-1db,IIP3,NF,etc.If we get the parameters,we can design circuits of the blocks in CADENCE.But I am confused now,how can i model the blocks in matlab or A

## low pass filter design using matlab.(program)

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.

## filter impelimentaion in mat lab

i wan to impliment the filter(lpf,HPF,etc) in matlab ihave tried but can't done any one who done it plz help me

## help to design a filter using Matlab?

Hi, I am trying to design a digital filter using the following parameters with use of matlab 1) sampling frequency 2)Order 3)Filter cutoff frequency Is it possible design a filter these three parameters. Please tell me how to design a filter with matlab.since i have two frequencies at the input of filter .I have to pass those two throug

## Matlab code for FIR filter design

Use FDATOOL in matlab. If you type >> fdatool in command window, Fda tool will be opened. There you can select FIR or IIR filter, order of filter and cutoff freq. of filter (either HPF, lpf or BPF). That code will automatically generate .m file for you.

## SNR measurement of SC filter in cadence

Hi All, How to measure the SNR of SC lpf in cadence and matlab...Can anybode tell me the procedure for measuring SNR of system in cadence..? thanks

## Filtering the data in matlab

helllo, 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 thia da

## How to design a FIR filter in fpga using Matlab?

I have used it, well certainly not to the most possible extreme, but to my knowledge, I have created a lpf, and had my resuts succesful, but had some issues with the cut-off frequency range. You first need to add FDA tool into your design. use the matlab tool to design your filter. After your design, just drag a n-tap FIR Filter block from DSP. Upo

## design LPF given i/p signal its sampling freq, req o/p

Hai everyone, 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 filter in matlab Thank you

## how to model noise contribution of LPF in PLL

The resistor is the only noise component in the lpf and it's noise in the loop is bandpass. It appears between two poles at the origin one in the forward path to the output and the other in the feedback path.

## need to add low pass filter in matlab code

Use the following code for creating a low pass filter : Determine the cut off frequency and change Fc appropriately Fc = 500 ; %cut off frequency w = Fc/(2*fs); % Normalized frequency %design a low pass fitler with above mentioned specifications =butter(5,w,'low'); %5th order butterworth lpf =freqz(b,a,1024); %Frequency response

## Filter's type - matlab function

Hey, i've line in matlab example code: lpf = lpf_b*lpf_prev + lpf_a*mixer_I + lpf_a*mixer_I_prev ; This is part of 'for' loop where is signal 'mixer_I' filtering. I see this is IIR but I dont know how could I write its transfer function. This is one of lpf in (...)

## how to find coefficints for loop filter of a costas loop

I am need of designing a loop filter for costas loop. I was said that loop filter is nothing but iir filter of order 2. For example costas loop to track 25khz carrier frequency with .02% crystal oscillator deviation. In this example a 6 bit nco is used. After lpf section on both arms and phase detection we get a vector 16 bits NCO uses a acc

## Simple first order lpf?

I'm not famliar with digital filters. I want to implement a simple one to learn. Here is an example: In that, there is a coefficient α, which is obvious, an output, a previous value of the output and an input. I wonder, if i want to apply this how would i decide somethings like; 1-What

## How to design 3rd order RC filter

I want 4kHz lpf, I design R=780K, C=10pF, and 3 same RC in series, the -3dB is about 4KHz, is the design right? if right but the size is too big to integrate in IC, can anyone give me some instruction to design a low cost lpf, thanks!

## Efficient digital filter for QPSk

I want to design a efficient filter for QPSk in matlab's simulink DSP block set. I know that i need upsampler+lpf+Interpolation filter but i am looking for such a filter which can do all thses together. Is it possible? If yes or not, please suggest me and give me some IEEE paper where i can get the design. Thanks in advance.

## how to calculate the natural frequency for PLL?

Hi, guys, If we already have the parameters for passive third-order lpf, how to calculate the natural frequency and damping factor? we can find the equations to get these for second-order lpf. but I do not know how to get those for third-order passive lpf. thanks.

## Help me find error in PLL simulation using Simulink

Hi, I am trying to simulate the behaviour of a type 1 PLL using simulink, the loop parameters are: Wlpf=2pi*(1 MHz); Kvco=100M Kpd=1 So the loop T.F. is T(s)=(Kvco*Kpd*Wlpf)/(S^2+Wlpf*S+Kvco*Kpd*Wlpf); I am using three blocks: 1. input block which is a step source to simulate the input phase. 2. "Transfer function" (...)

## Sigma Delta - Two stage decimation filter

I am designing a two stage filter to do decimation at the output of a Sigma Delta modulator. Here is the spec - Sampling frequency - Fs - 1.4MHz Decimation factor - D - 100 Output resolution - 13 bits. The filter, and the modulator is reset every 100 clock cycles. To accomplish this, I used a 5 stage CIC filter to decimate by 20 fo

## Can't use 'tf' in new version matlab for pll m-file

Dear all: I have wrote a pll matlab file to simulation PM, BW..., the m-file is ok when I use matlab r13. But our company update the matlab to new version r14, I can't us 'tf' to create the transfer function, could you help me? the following is the example for my m-file: Rp = 4.82e3; Cp = 118.1e-12; Cs = 11.3e-12; (...)

## Need help for applying low pass filterand down sampling

I am having a wave file. I have to implement this operation on it. the picture is attached I have read the wave file in matlab. Now i want to down sample it.kindly help me to implement second part of picture. the lpf should have 6 KHz

## BPSK Demodulation code

Hi. I have the same problem. I am trying to demodulate BPSK signal and here is my way: BPSK signal .* carrier => integral => compare with 0 (if >0 is 1 and <0 is -1)=> recover original signal. Use can follow this link: but if we use lpf, the BER is really high. My teacher said "use inte

## Markov process, command input

a First order markov process: essentially the present state does not depend on the past is the highlight given the present state value. For the markov model you can model a simple Binary channel with probability P. i.e. if there is noise the 0->0 as 1-P and 0->1 with prob P. Similarly, for "1". if your using matlab

## FDAtool matlab, filter design

hello, i have designed a lpf using fdatool, now i wanna use this filter to filter an input signal x , so i use filter(Hd,x) ,in the generating m file with the designed filter but it turns error, what should i do, use export instead or what? how to use the filter designed to filter my data within my m file code ? thnx

## Question about cutting bits in fixed point FIR

Hi ALL in now days i design FIXED POINT FIR that wil be implemented on FPGA the filtering unit using cic decimation followed by 2 fir lpf. the input to the unit is 32 bits - 30 fractions and 2 for real number. the end of the unit in 57 bits and i take just the fractions -51 downto 22. when i analyze the FILTER FREQUENCY RESPONSE ( for t

## Re: Find the R-R interval in ECG Matlab Code

x1 = load('ecg3.dat'); x2=x1; fs = 1000; % Sampling rate N = length (x2); % Silength t = /fs; % tiidx figure(1) subplot(2,1,1) plot(t,x1) xlabel('second');ylabel('Volts');title('Input ECG Signal') % Cancellation DC drift and normalization x1 = x1 - mean (x1 ); % cancel DC conponents x1 = x1/ max( abs(x1 )); % no

## Suggestion regarding Demodulation

Hi, I am new to Digital Communications and matlab. I am learning to implement modulations and demodulations in matlab. I have an amplitude modulated signal at the receiver input. I am trying to recover the message bits after the demodulation. Following are the parameters of the modulated signal: Carrier frequency = 22000 Hz (can be

Hello Everyone I am working on Delta Sigma ADCs in matlab, to equalize the amplitude of input and output I have to multiply the output by a scaling factor, anyone who has experience of ADC (using or working on ADCs) share the reason for this scaling ? and Secondly the SNR after Delta Sigma Modulator ~66 dB and after Decimation it drops to ~50dB

Hello Everyone I have got the output of Delta Sigma ADC after Decimation (FIR lpf and Downsampling), How to convert Delta Sigma ADC's output to its voltage equivalent ? Any suggestions/relevant material will be helpful. Thanks in Advance.

## vox, harris algorithm

Hi, Can anyone please tell how delay and multiply affects a speech signal. I was trying to implement Harris algorithm for Vox in matlab. It was a simple one in first look with a delay and multiply and an lpf after that. But i could not get the expected output. I am newbie to DSP. Thanks, RTV

## Matlab+ FIR filter that compensates for the ?sinx/x? effect

It is not clear for me if the signal has a sinx/x shape in the time domain or in the frequency domain. If you wish attenuate the side lobules with a low pass filter use y is you signal in the time domain fl=100; % lpf length fbe=; damps=; % design of lpf parameters, analyze

## How to verify a design of digital filter?

Thanks for your help first. Then, I jsut used C for a reference model. Here I try to design a lpf. I mixed 1.5M and 10M as input. The lpf pass band is set to 1.5M. I can see the freq. of the output is less than that of the input, but not equal to 1.5M low-freq input. Is this result right? How to verify the detail performance requirement?

## Help with question on Wavelet Decomposition

Hi all, I am newbie in wavelets.. Just read the matlab wavelet tutorial as I found it the simplest amongst others to understand.. I want to ask that during the DECOMPOSITION phase in the DWT, when a signal is convolved with HPF and lpf to yield details and approximation.. Q: How are the co-efficients chosen for the HPF and lpf so (...)

## Interpolation (upsampling)

There are two methods 1. between each samples add 7zeros and take lpf. 2. If u want to take interpolation for 50 samples first take fft of 64 samples by padding zeros. Consider only 33 values. add 224 zeros to it (224+257) Take ifft of 512 samples. These two methods explained in Scientist and Eng. guide to DSP. Bye Sanbaba

## digital PLL and analog PLL

digtal PLL: digital PFD+charge pump+lpf+VCO, most porpular now; all digtal PLL: digital PFD+digital low pass filter+DCO, it have high phase noise, for example, MT4409 from Zarlink; analog PLL: analog PFD+lpf+VCO.

## Signal processing of a sampled signal

By the look of it, it looks like a low frequency signal ADDED to a high frequncy signal. If this the low frequency one available elsewhere or known in advance, you can just subtract it from the signal. You can laso try subtracting away your lpf output from the signal. But these methods assume that there is no change in the peak amplitude of the

## Help me build FM Radio Station using Simulink - 50 pts

If you just want to use a black box and don't want to build the whole transmitter and receiver, you can use the FM modulator/demodulator passband present at the communication blockset=>Modulation=>Analog passband modulation. If you would like to build the transmitter and the receiver, you can use the Voltage-controlled oscillator present at comm

## Low pass filtering an upsampled Ramp signal

Hello, 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 normal transient response

## Coaxial resonator bandpass filter

Hello Radiohead, Here is the attached PDF on lpf filter design using coaxial resonators, using AWR Microwave Office (MWO) & matlab... ---manju---

## Looking for Analog/Mixed-Signal/RF IC Design Job

Hi, I'm a licenciate student in Finland. I am looking for Analog/Mixed-Signal/RF IC Design Job in Europe or US. I have about five years IC design experiences. I designed DAC, lpf, PA, Opamp. I'm familiar with most popular EDA tools like composer, virtuoso, hspice, hsim, spectra, spiceexplorer, calibre, xcalibre, protel, matlab/simulink etc. I ha

## my 1st sigma delta modulator simulation

Hi, all..i'm new in Sigma Delta Modulator. I try to built SDM for my final project. I simulate for 1st order SDM which can see in attachment. I simulate it using Circuit Maker. I need suggestion about it. And i have question about how to design high order (> 1) SDM. I read some paper, and for high order SDM you can replace integrator (which

## How to compensate the phase error introduced by a low pass filter?

The first figure below shows the matlab/Simulink model of a low-pass filter (lpf). The cut-off frequency of the lpf is fc=10Hz. The sinewave frequency is fe=2Hz. As shown in the 2nd figure below, the lpf introduces a phase error at fe=2Hz, resulting in a filtered sinewave with phase error (see 3rd figure below). Is there (...)