# Tagged Questions

9 views

### Analyzing Cyclic Behavior of the Temperature in an Office Building

let us consider following code ...
14 views

### choose correct variant of signal/noise ratio calculation

let us consider following sinusoidal model ...
38 views

### Fourier transform of a continuous non-periodic function in matlab

I would like to use matlab to find an Fourier transfom of a function which is known only on a grid. As an example I take the function f(x) = exp (-x^2), which Fourier transform is known and is equal ...
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### How do I get around finding a digital filter which is a narrow bandpass with a small group delay?

I need to find a digital filter that meets the following criterion: Is a narrow bandpass (1/40 of normalized frequency width) As small as possible group delay (preferably less than 300 samples) ...
26 views

### Top and bottom power spectral density of a height profile

Imagine I have a simple 1D height profile which is NOT symmetric. Now, what is truly important for me is to know what are the frequency content of the top profile (i.e. a cut profile above the ...
68 views

103 views

### calculating an incoherence property

With respect to Matrix Completion and Compressive Sampling (CS) I'm trying to understand how to calculate an incoherence property μ between two bases Φ and Ψ. Getting this incoherence is important ...
56 views

### Generating points from a standard Gaussian

I'm new to Gaussian distributions and I'm trying to generate say, $N$ points from a $M$ dimensional standard gaussian. What does this mean? How would I do this in matlab?
102 views

### Whitening matrix for Fast ICA

I have a matrix $X$ with dimension say $m \times n$ with $m> n$. I am trying to whiten this matrix in matlab by first taking the $C= \operatorname{covariance}(X)$ followed by eigenvalue ...
272 views

### How to measure power spectral density in matlab?

I am trying to measure the PSD of a stochastic process in matlab, but I am not sure how to do it. If this is not the right place to ask, please point me in the right direction. The stochastic process ...
71 views

### Output of wavelet transforms

I am working on a time sensitive computer science and fluid dynamics project that requires me to find applications of wavelet analysis. I know that at its core, a wavelet transform simply takes a ...
631 views

### Discrete Convolution

Does someone know the equation for the discrete convolution? I found here that the formula is: $$\{x*h\}[k]=\sum_{t=-\infty}^{+\infty}{x[t]\cdot h[k-t]}$$ But when using in Matlab/Octave the command ...
155 views

### Convolution property in terms of fft (matlab)

I am working on some signal processing and I have the following data: ...
208 views

### Using FFT in matlab

I am not completely sure if this is where a MatLab question belongs, so if not, please direct me where I should ask. But onto my question. I am working on trying to deconvolution a signal with ...
88 views

### Signal approximation using linear combination of functions

How I can approximate the signal $x(t)=0.001\,t^3 \exp(-0.1t)$ in the interval $[0,100]$ using a linear combination of the following functions: $f_1(t)=A_1$ $f_2(t)=A_2\cos(0.05t)$ ...
8k views

### square wave matlab code

I'm having some trouble generating a square wave in matlab via my equation. Just wondering if anyone has some insight on what I am missing here in my code? I was thinking I could easily generate a ...
972 views

### Visualize a difference equation with Matlab [closed]

I have a difference equation for a Single Pole Infinite Impulse Response Filter, defined on a discrete time-series: $y[n]-(1-\alpha)*y[n-1]=\alpha*x_n$ While the []s brackets refer to a position n ...
1k views

### time derivative of discrete data in simulink

I'm implementing a program in Java that was delivered in Simulink. My expertise is limited, and I'm stuck on converting a derivative block. The simulink code applies a du/dt block to the input data. ...
1k views

### constructing Feature Vector from given values

I am fairly new to signal analysis, so pardon any noobish questions, but I couldn't find a clear answer by googling. I am using PyLab to calculate certain values from a given data. My data is a 3D ...
211 views

### How to apply the solution of $y(n) = (0.85)y(n-1) + x(n)$ to data

I learned how to solve difference equation $y(n) = (0.85)y(n-1) + x(n)$ using z Transform, and inverse z Transform, I get $h(n) = 0.85^n u(n)$ where $u(n)$ is unit step sequence. Now my ...
532 views

### Finding the poles of a system from a difference equation in MATLAB

I have a system tha is described by the following difference equation: $y(n) + 0.3y(n-1) - 0.3y(n-2) = 0.5x(n) - x(n-1)$ How can i compute, using MATLAB (e.g. with ...
97 views

### Solving multiple phase angles for multiple equations

I have several equations and each have their own individual frequencies and amplitudes. I would like to sum the equations together and adjust the individual phases, ...
54 views

### Calculating Basis Functions for DFTs (64 Samples)

I am attempting to graph some 64 sample'd basis functions in MatLab, and getting inconsistent results -- which is to say, I'm getting results that are still sinusoidal, but don't have the frequency ...
13k views

### Matlab Speech Recognition - Mel-Frequency Cepstrum Coefficient (MFCC)

I'm following this Matlab Speech recognition tutorial. I'm stuck on page 5 on the term/concept of MFCC feature vectors. I'm unable to grasp the concept of what an MFCC is.. a matlab function, ...