MATLAB (MATrix LABoratory) is a numerical computing environment and a fourth-generation programming language. Use this tag with care.. see excerpt.

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Very high SNR BPSK modulation

I am using BPSK modulation to modulate signal in continuous time (making rectangular waveform, multiplying by a carrier) I should pass signal through band-limited channel, which has following ...
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27 views

how to find the distance of the root from the origin?

Good Day, I have 9 polynomial roots. i have plotted the roots. my problems are: 1)how to find the distance of the roots from origin? I want to find the distance of all the roots from the origin. 2) ...
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12 views

denoise image matlab/octave Gaussian noise

I want to remove a noise for an image using matlab, when the observed image is $$f=u+v$$ where $u$ is the restored image (is the image i want recovered) and $v$ is the gaussian noise. To restore $u$, ...
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1answer
15 views

How can I generate audio wave files of harmonic series/partials for a specific frequency in Matlab

this is the only code I know, but it is for one specific frequency and not for its harmonic series, I am trying to get all the partials as individual files, eg. If I want to generate 40hz sine ...
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11 views

period, amplitude and phase through FFT in matlab

I need to compute period, amplitude and phase of the signal from spectrum analyser. It looks like a sin wave. Since i am new to Matlab and also have limited idea about fourier transforms, I am looking ...
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6 views

EEGLAB: going from a .bdf file to a MATLAB matrix

I am looking for the assistance of someone familiar with EEGlab (for MATLAB). I'm using an online dataset from this site, just trial 1 for now. Essentially I have a bdf file and an elp file, and I ...
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1answer
25 views

Initialize a Room Impulse Response using reverberation time(T60)

I am doing Speech dereverberation using Non-negative matrix factorization. I need to initialize an impulse response($H$) such that its reverberation time ($t_{60}$) is $300$ ms. Let the length of $H$ ...
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1answer
29 views

How to plot the root of polynomial in Matlab?

I obtained this polynomial equations: $$A(z) = 1 - 0.7987 z^{-1} - 0.125 z^{-2} - 0.511 z^{-3} + 0.06889 z^{-4} + 0.3465 z^{-5} + 0.4809 z^{-6} + 0.04951 z^{-7} - 0.5298 z^{-8} + 0.1828 z^{-9}$$ How ...
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6 views

Singularity Detection from 2D Wavelet Modulus Plot

I was wondering if I could get some tips/resources on how to pick out the singularity from my 2D Continuous Wavelet Transform Coefficient Plot (scalogram) using the Gaussian Derivative as the ...
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1answer
20 views

Using pathloss in matlab

This is probably a very simple case but I am not sure where I am going wrong. In order to estimate the effect of path loss in Matlab, the function fspl(R,lambda) ...
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14 views

Advice for creating differential microphone array

For a school project I'm required to create a differential microphone array that can filter out background ambience, so a clear voice signal can be recorded in noisy environments. The plan was to use ...
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28 views

Matlab : Unable to implement and understand the expression $E[\mathbf{y_{t-1}y_{t-1}^T}]]$

An AR model of order $p$ is expressed as $y_t = \mathbf{h^Ty_{t-1}} + x_t$ where $x_t$ is a nonlinear signal acting as the driving process generated from the function $x_t = ...
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15 views

Effect of pathloss on signal power

Consider I have two transmitters $tx_1$ and $tx_2$ at say a distance of $d_1=5\text{ m}$ and $d_2 = 15\text{ m}$ respectively from a receiver. Now, if I consider the effect of path loss in such a ...
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11 views

Vienna Simulator Matlab [on hold]

Does anyone know the system level Vienna simulator for Matlab? I don't understand how the UE spectral efficiency is calculated, as well as the UE throughput: when I look the results file, and I look ...
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18 views

MATLAB poly2trellis for Extended Hamming (64,57)

Current understanding: Extended Hamming (64,57) is constructed using generator polynomial 1 + x + x^6 followed by a parity bit at the end of the codeword to get even parity. The Extended Hamming ...
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20 views

How to calculate the frequency shift of FMCW transmitted signal and received signal using Matlab?

I generate a FMCW chirp signal between 18k-20kHz using Matlab, then sound the signal through the speaker in laptop, then record the reflected signal through the Mic in the laptop. What I want to do is ...
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3answers
36 views

Delay signal according to normal distribution

I am trying to delay a signal by a certain number of samples. This certain number, I would like to generate using a random normal distribution in Matlab. I am using the following for generating the ...
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15 views

Transformation validation

I am am trying to see the validity of my geometric transformation, by imposing a point i got from a tracker in the original image and superimposing it on the image after the transformations. The ...
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33 views

Velocity from acceleration data

I have an acceleration data from accelerometers. I want to get velocity from the data by integrate it using matlab. Here my coding :- ...
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1answer
27 views

zero-phasing frequency components while keeping the same magnitude, in Matlab

How is it possible? I was thinking of taking just the real part of the DFT of my signal (isn't that zeroing out phases?) with real(fft(X)) but the magnitudes ...
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1answer
92 views

Why do we discard imaginary part of the phase spectrum?

Suppose I compute phase spectrum from the fftn function in MATLAB as ...
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1answer
24 views

could not constract original matrix with matlab svd's function

I need to read a .wav file, make a 2D matrix from it using stft, generate singular value decomposition of it using svd method and do some watermarkings... but I can't build the original matrix again ...
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1answer
44 views

BPSK modulation under bandlimited channel

I modulated signal using BPSK modulation and I have series of -1 and 1. Now I have to pass these signal from band limited channel that has frequency response of the form ...
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1answer
47 views

What is the estimator used in this paper for system identification?

Paper : System Identification using Symbolic Chaotic Sequence download link proposes EM-UKS estimator for system identification of a linear FIR channel when excited by non-linear input. In Fig 3 of ...
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13 views

Divide wav file to frames (windows) with specific number of samples and plot time waveform and frequency spectrum [closed]

I have wav file x with duration 10 seconds and sampling frequency 48kHz. How can I plot the time waveform showing only 1024 (or 2048) points? I guess I need to divide the file to frames, so after I ...
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23 views

What is pulse train filter?

I have recently seen some code written in modelling tool like Simulink, ASCET which uses PT1 filter? Why do we use a pulse train filter? What is the difference between FIR, IIR, Chebyschev, ...
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1answer
23 views

'xcorr' function in matlab not working for zero signal

I came across an interesting problem when using 'xcorr' in MATLAB. The expected signal and generated signal both are at zero DC. So, I expect correlation coefficient to be 1 or perfectly correlated. ...
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1answer
30 views

Gaussian in matlab

I have written a function that implements a gaussian filter. I use fft2 to transform my image and my filter to 2d fourier transform. Then I multiply them and then use ifft2. The resulting image is ...
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2answers
144 views

relation between luminance and eigen values of an image

There are some research papers in the literature which apply Singular Value Decomposition (SVD) on an image to decompose the image matrix into U, ...
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1answer
26 views

Shift a signal by a given number of samples

Is shifting a signal by a given number of samples, say $n$ samples, the same as the following in matlab: signal(n:end) instead of signal(1:end). That is, if the size of $signal$ is 200x1, does it ...
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15 views

how do we know that the AR model equation obtained in s-domain or z-domain?

i have obtained AR(9) model equation from time domain analysis. but how do i know the equation obtained whether in s-domain or z-domain? because the analysis for s-domain and z-domain is different. i ...
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1answer
30 views

Frequency filtering with a DFT and meaning of removing complex conjugates

I've seen many implementations to filter out frequency components of some time domain signal by performing a DFT, zeroing the unwanted frequency bins, and performing the IDFT to get the filtered ...
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30 views

Determining The Sparsity or Density of a Chroma Vector

I have a range of songs where I have took an 'unfolded' chromagram computed from a series of short-term windows. Specifically, for one song, I have one vector which contains the amplitudes of the ...
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14 views

Matlab Filter object for zero insertion interpolation

With Matlab we can model filter chains using filter objects. One type of filter object is the mfilt.holdinterp which performs sample and hold interpolation. Is there a way to create a zero insertion ...
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53 views

how to determine the order from Auto-Regressive model in Matlab?

i am now having time series vibration signal recorder for 10 second. from the vibration signal, i segmented it into numbers of frame. i need to use an Auto-regressive model for this signal. Ar model ...
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1answer
51 views

Fourier Transform of a Pulse Train (Frequency Comb Simulation)

I am trying to take a Fourier transform of a femtosecond pulse train and plot the frequency spectrum. I followed this question and am able to create a pulse train and plot both the time and frequency ...
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1answer
22 views

Fourier Transform for speech signal [closed]

I need some clue on how to apply the Fourier transform to a wideband discrete signal like speech in Matlab. What I want to do is to apply the MUSIC algorithm to the speech recorded by a set of ...
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1answer
13 views

In which area the image dithering technique is used? [closed]

I know its an old technique but can someone tell me in which areas the image dithering technique is used and why?
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3answers
126 views

Signal processing - why compute imaginary part?

I'm new to signal processing. Could somebody explain to me what are the benefits and reasons for decomposing a signal into real and especially imaginary parts? I'm looking at the hilbert transform ...
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3answers
70 views

Pre-processing EEG signals

Good Afternoon Everybody. I am developing filters for EEG signals in these days. During the Develop I find some problems: The filter is FIR (band-pass using a convolution of low-pass filter and ...
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2answers
42 views

implementation of Fourier denoising with hard threshold

I just tried the Fourier denoising method with a hard threshold and my code is as follow: ...
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1answer
26 views

Implementation of a cascaded IIR filter

I am attempting to implement a cascaded IIR filter in MATLAB. I used fdatool to design the filter and exported it as an object, Hd. In my script, I import a log file of data I captured and store my ...
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21 views

How can I improve the performance of this filterbank script?

I implemented a paper on harmonic tracking based on filterbanks in Matlab. The center frequency of each bandpass filter is updated at every time step in order to capture an harmonic component: ...
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34 views

ECG noise filtering using FIR Bandpass Filter

I am new to signal processing and examine ECG data corrupted with noise. The clean data has a frequency spectrum like this. And the corrupted one looks like this (sorry for the different scale) ...
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2answers
37 views

Any basic paper on biomedical signal processing to practise with?

I am quite interested in biomedical signal processing and I am looking for some biomedical signal processing papers in order to reproduce the results that they obtained. The idea is to redo what they ...
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1answer
36 views

How do I perform Specral Analysis (FFT, Windowing, Detrending) on Sonic Anemometer Data?

I am having trouble with all of the forums that I have looked at thus far. I have one day's worth of Sonic Anemometer data. I want to see the specral analysis of this data. When the anemometer data ...
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2answers
54 views

Difference between MATLAB hough and my implementation

I am trying to recreate MATLAB's hough function with mine. My code follows ...
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0answers
44 views

Cannot see effect of modifying eigen values in Python (SciPy, NumPy)

I am doing some experiment for increasing the intensity of low exposure image by changing (increasing) the eigen values. In Matlab I apply Singular Value Decomposition on the image matrix to get ...
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3answers
67 views

Zero-frequency response of an IIR transfer function

I have a question about the zero-frequency (DC) response of a IIR filter. The coefficients of the 3rd order IIR filter are as follows, ...
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1answer
59 views

How to add white gaussian noise to an image in Matlab?

I want to add white gaussian noise to an image of 10 dB in Matlab. I tried to use Matlab function imnoise but I couldn't figure out what values for mean and variance should I choose to add noise of ...