0
votes
1answer
16 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 ...
3
votes
1answer
36 views

Image Reconstruction:Phase vs. Magnitude

Figure 1.(c) shows the Test image reconstructed from MAGNITUDE spectrum only. We can say that the intensity values of LOW frequency pixels are comparatively more than HIGH frequency pixels. $$ ...
0
votes
1answer
37 views

Query regarding phase of analytic signal.

Using the following matlab commands, phase of analytic signal can be obtained. sig_a = hilbert ( sig ) ; ph = atan(angle(sig_a)) ; As for as my understanding is angle(sig_a) will give phase of ...
0
votes
0answers
29 views

understanding of discrete prolate spheroidal sequences

i would like to know some details about discrete prolate spheroidal sequences or Slepian sequences,because they have application in multitaper method used in DSP,as i undersood they are time varying ...
1
vote
0answers
25 views

analog BANDPASS filter difference equation

does anyone know what is the difference equation for band pass filters in terms of bandwidth,low frequency,high frequency.... I'm trying to design a band pass DISCRETE filter using Mat lab !
1
vote
0answers
13 views

recovering of time series in SSA

i am trying to reconstruct time series from SSA ,because according to this link http://en.wikipedia.org/wiki/Singular_spectrum_analysis there is procedure ...
0
votes
1answer
140 views

Autocorrelation and spectral density in MATLAB

This question is threefold. We have an LTI system that is a first degree Butterworth LP filter with the power TF where fu = 110Hz and ...
0
votes
0answers
30 views

Phase vocoder equation

I know I can adjust the frequency of a waveform using a modified version of the sine wave equation amplitude*cos(2*pi*frequency*time+phase) this will allow me to adjust the frequency of a signal. ...
0
votes
1answer
732 views

Getting wiener filter coefficients in Matlab

I need to find two coefficients (w1,w2) for a wiener predictor filter of the signal x(n)=0.65x(n-1)-0.7x(n-2)+v(n) where: ...
0
votes
1answer
61 views

Plot recursive signal in Matlab

I need to create and plot this signal in matlab with 2000 points: x(n) = 0.6530 x(n-1) - 0.7001 x(n-2) + v(n) Where $x(-1)=x(-2)=0$ and $v(n) =$ white noise I ...
1
vote
2answers
61 views

Reducing a two term signal to one term

I am trying to solve a phasor addition problem, reducing from its original form to $$X(t) = A \cos(\omega_0 * t + \phi)$$ The original equation is : $$X(t) = 2 \sin(\omega_0 * t + 45) + ...
1
vote
1answer
96 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 ...
3
votes
2answers
51 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?
1
vote
0answers
94 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 ...
0
votes
0answers
256 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 ...
1
vote
0answers
68 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 ...
1
vote
1answer
445 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 ...
1
vote
0answers
148 views

Convolution property in terms of fft (matlab)

I am working on some signal processing and I have the following data: ...
2
votes
1answer
192 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 ...
0
votes
1answer
87 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: $f_1(t)=A_1$ $f_2(t)=A_2\cos(0.05t)$ ...
1
vote
3answers
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 ...
1
vote
1answer
952 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 ...
1
vote
1answer
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. ...
1
vote
1answer
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 ...
0
votes
1answer
193 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 ...
1
vote
1answer
501 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 ...
1
vote
0answers
96 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, ...
1
vote
1answer
53 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 ...
2
votes
3answers
12k 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, ...
1
vote
1answer
593 views

How can I increase/decrease (frequency/pitch) and phase using fft/ifft

How can I increase/decrease (frequency/pitch) and phase using fft/ifft I think I have the basic code but I’m not sure what to do next PS: It's done in Octave/matlab code Example I have a signal that ...
0
votes
2answers
4k views

MATLAB interpretation of Xcorr2 - Cross Correlation function

I have two vectors of matching lengths. They are readings from two different sensors (one is from a smartphone and the other is from a wiimote) of the same hand movement. I am trying to find the time ...