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0answers
25 views

What is spectral subtraction? [on hold]

I have to write some simple examples in Matlab which use spectral subtraction. These examples will be included in a paper to help a friend understand spectral subtraction. But I don't know where to ...
0
votes
1answer
17 views

Applying a mathematical function to a 16-bit Python array

I am using scipy.io.wavfile to read a WAV file and playing it with pyaudio. Before the numpy array is written to a string and output through pyaudio, I would like to be able to apply some sort of ...
-3
votes
1answer
37 views

How Fourier decomposition is performed?

The Fourier decomposition explains a time series entirely as a weighted sum of sinusoidal functions and with the Fourier series,it is possible to do it. But I have some doubts Suppose ,for any ...
0
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0answers
14 views

error using vertcat when finding cross-correlation [on hold]

I got an assignment in finding delay using cross-correlation between two audio signal that we recorded in MATLAB. This is the code : ...
0
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0answers
43 views

Getting the frequency of a 0.33Hz to 3Hz signal

I read a noisy signal from an accelerometer which is attached to the pedal of a stationary bike and need to find the frequency of the signal/ speed of the person cycling. I taught of the following ...
0
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0answers
61 views

MATLAB, recover a signal that has a cosinusoidal interference and that has been AM modulated

I have a signal which has been AM modulated but the channel also added a cosinusoidal interference A cos(2 * Pi * f0 * n * Tc + Phase), at the same ...
0
votes
0answers
7 views

How to offline classify EOG signal generated from eye movement?

I have the sample of EOG sample data in Matlab format in three column matrix (time,horizontal channel, vertical channel) and I want to extract the pattern of the eye movement from that sample which ...
0
votes
1answer
44 views

Minimum Energy Delay Property

I have 4 systems which are represented in z domain like this: Where I know the poles and zeros. Then I compute Partial Energy Sequence of impulse response of all these system using this formula: ...
0
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0answers
23 views

Half Sine Pulse Shaping design

The standard of 802.15.4 specfies the following 'The chip sequences representing each data symbol are modulated onto the carrier using O-QPSK with halfsine pulse shaping.' For pulse shaping the ...
0
votes
2answers
34 views

Upsampling by zero padding or duplicating sequence

I need to upsample a 2 MHz signal by a factor of 3000 to convert the OQPSK modulated baseband signal to passband. When I upsample by duplicating the elements in the sequence, I seem to get less error ...
0
votes
1answer
33 views

Frequency Spectrum of a sequence

The OQPSK modulator in Matlab produces an output sequence as follows: [0.707 0.707+0.707i -0.707-0.707i ...and so on ] This is the sequence and I am trying to view the frequency spectrum of this ...
0
votes
0answers
18 views

Theoretical BER - 802.15.4

The 802.15.4 standard gives a formula for the BER calculation but they have considered interference while computing this formula according to what I understood. I am trying to find out what the ...
2
votes
4answers
99 views

Why every musical instrument sounds different than any other while listening?

This is soft question.I am not expert in music. We know that English language has 26 letters (which are again grouped into vowels and consonants) , while language of music is same all over the world ...
0
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0answers
21 views

A question related to “quadrature carrier multiplexing” [migrated]

While studying 'Qaudrature carrier multiplexing', I came across these statements in my text material: "Precisely varying the phase of a high-frequency carrier sine wave in a hardware circuit ...
0
votes
0answers
21 views

time domain non stationary time series individual colored noise identification algorithm

One of the methods for identification of modulated colored (stationary) noises is that of lag 1 autocorrelation power law noise identification algorithm. This method can determine the dominant noise ...
0
votes
2answers
54 views

adding noise to a signal

I have an audio file. I took an extract of the file called variable "CALL", and I took another extract from the file which is just filled with background noise, called "BACKGROUND". Using matlab, I ...
0
votes
1answer
54 views

Matlab: if given nothing but an audio file, how do I modify it to produce incrementally lower signal to noise ratios?

I have an audio file with a high sampling rate of 250khz. It contains animal noises. I've built a program which counts all the animal noises. However, I want to find out how robust the program is and ...
0
votes
0answers
11 views

Dolph-Chebychev window and Beam Steering

We have made a Doppler sonar which is comprised of a braodband transmitter and an 8-element receiver arranged linearly. We collected some data at 500 kHz. I would like to steer the beams and apply a ...
0
votes
0answers
49 views

Correlation between two graphs in Matlab

I am trying to make a system that detects footsteps. First I filter and decimate the original signal, then I make a convolution between the filtered signal and a single footstep, then I extract the ...
0
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0answers
26 views

What is the physical meaning of the s-space?

In my audio processing lecture, the term s-space came up. My instructor basically told us that it's a space where we perform calculations that couldn't be ...
0
votes
1answer
25 views

Sketching Phase Spectra Using Group Delay and Magnitude Spectra Informations

I have only magnitude spectra and group delay information and I need to sketch phase spectra from this information. For example, group delay is given like this: $\tau_{g}(\omega) = c$ where c is a ...
-1
votes
1answer
45 views

Properties of Stochastic Processes [closed]

I have a basic question about stochastic processes: When some informations such as wss, uncorraleted sampled, white about random signal (say x[n]) are given, what do we exactly have? For example ...
0
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0answers
22 views

Matlab and principal component analysis, I don't quite understand

The way I understand PCA is that you means adjust the data. create a covariance matrix, get the eigen values and vectors from the matrix. then order them (the ordered vectors are your principal ...
-1
votes
2answers
103 views

What the terms Basis functions and Orthogonal denote in case of signals?

I am a beginer. I have read that any given signal whether it is simple or complex one,can be represented as summation of orthogonal basis functions. Here, what the terms Orthogonal and Basis ...
2
votes
1answer
103 views

How to find phase values on precise pixel locations of a given Image? [closed]

I have computed magnitude and phase spectrum of cameraman Gray scale image using fft function. Here, we get magnitude and phase spectrum of the whole image. .Please see the reconstruction of image ...
0
votes
1answer
32 views

comparison of speech signal processing and financial data

I have read that in speech signal processing analysis when voice is segmented in brief temporary segments the series segments transitions from being non stationary to stationary. My question is if ...
-1
votes
0answers
19 views

Large scale consecutive matrix multiplication applications

I am running some experiments with matrix multiplication and I am looking for applications (preferably signal processing applications) where multiple input matrices A(i), [i=0,1.....] are multiplied ...
0
votes
2answers
130 views

Signal decompositon

I am not a good in writing algorithm but please follow below steps 1.There are 4 1D sinusoidal periodic signals.3 of them are given by \begin{cases} x(t)=4\sin(10\pi t) \\ y(t)=8\cos(20\pi t) \\ ...
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votes
0answers
7 views

use of recurrence quantification analysis for deterministic signal identification and classification

The recurrence quantification analysis (RQA) is a method of nonlinear data analysis which quantifies the number and duration of recurrences of a dynamical system presented by its state space ...
2
votes
0answers
79 views

Analyzing accelerometer data: appropriate use of rotation matrices?

I'm working on a project in which a rod is attached at one end to a rotating shaft. So, as the shaft rotates from 0 to ~100 degrees back-and-forth (in the xy plane), so does the rod. I mounted a ...
0
votes
0answers
35 views

extrapolate turning points for a sine weighted moving average?

On a stationary signal a sine-weighted moving average is calculated (SWMA: the coefficient vector looks like the first (>0) part of a sinusoid). The SWMA looks like this: very smooth: The future is ...
0
votes
2answers
41 views

Simulation of a pressure field developed by a song

Greetings! What I am doing: In short, I want to write a program that is fed a song as a wav file, and spits out an animated contour plot indicating the relative pressure/loudness/quantity indicating ...
0
votes
2answers
65 views

short time energy matlab code for audio feature extraction

Is there code in matlab for short time energy feature extraction in matlab?? I want to extract audio feature (Short time energy) using matlab code
0
votes
0answers
36 views

Kalman filter - mathematical model for signal strength based tracking

I'm currently trying to wrap my head around Kalman filters. I've read some tutorials/introductions on this subject and am trying to apply it to a problem to get a better understanding of the mechanics ...
2
votes
0answers
27 views

Signal conjugation detected on RF recording samples, why?

I collected spread spectrum signals at 400 MHz at low elevation angles using Software Defined Radio complex sampling over the seasons. I noticed that over watery, icy surfaces, the RF samples are ...
0
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0answers
24 views

Is it possible to calculate the variance of signal in real time implementation? [duplicate]

In communication system, when we received some signal which contain our message of known variance sigma_s which is corrupted in noise of unknown variance. If I need the variance of the signal in ...
0
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0answers
34 views

Is there a principled way to distinguish between these signals?

Consider these two signals: They both describe a biological process going on in the same subject. The blue one is obtained at rest and the red one after the subject is perturbed. Is there a ...
0
votes
0answers
34 views

“Quantifying” rotational acceleration from an accelerometer

I hope this post isn't too long, but I'm desperate for help and want to be pretty detailed/specific. I have recently built a system where a rod is attached at one end to a rotating shaft. So, as the ...
0
votes
1answer
17 views

position of null carriers in N=256 subcarier OFDM

can anyone tell me the position of null subcarrier in $N=256$ subcarrier OFDM. since edges re assigned null to prevent interference from an adjacent symbol, i assuming that the subcarrier $-127$ to ...
0
votes
1answer
36 views

What is an image in DSP context?

I frequently see the term "image" thrown around in various DSP discussions. What exactly does image mean in this context? Thanks!!
0
votes
0answers
14 views

A Suitable DSO Replacement

Currently I have a Pipeline leakage detection system the concept is that we are using a striker to strike the pipe at the generator side and receive the sound waves at the receiver side both separated ...
1
vote
1answer
87 views

What is the physical interpretation of the dB scale on a bode plot and what is a negative dB?

I have no physical interpretation of the Bode plot. What does it mean for a bode plot to have negative dB over its entire duration on the log-scale frequency?
3
votes
2answers
182 views

Whether phase congruency and phase coherence terms are same or different?

I am beginner in Image processing.I am studying the importance of phase in signal.Can anybody explain what is phase congruency ? Also,I am confused between terms i.e. phase congruency and phase ...
0
votes
0answers
14 views

Quantitatively assess downsampled data vs original data

I have a dataset that is prohibitively large to work with in its raw state. I want to try different methods of downsampling to accelerate analysis, but need to be able to compare that reduced result ...
1
vote
4answers
476 views

What's the exponential term in Fourier Transform mean?

We know that Fourier Transform $F(\omega)$ of function $f(t)$ is summation from $-\infty$ to $+\infty$ product of $f(t)$ and $e^{-j \omega t}$: $$ F(\omega) = \int\limits_{-\infty}^{+\infty} f(t) \ ...
0
votes
0answers
32 views

Time frequency representation of DWT coefficients in Matlab

I am using discrete wavelet transform to analyze an audio file. I can calculate the dwt coefficients and the inverse dwt works fine. What I want to do now is to visualize how different coefficients ...
0
votes
0answers
13 views

Beam profiler for detecting phase shift?

I'm new to signal processing and currently looking to detect a phase shift in a 633nm 10mW HeNe laser that is being run through a Michelson interferometer. Is a CCD beam profiler capable of detecting ...
-1
votes
1answer
45 views

Exact formula for alias of Discrete Fourier transform for periodic sigals

Suppose that $f(t): \mathbb{R} \to \mathbb{C}$ is a $T$-periodic signal, with highest frequency $f_h$. Now suppose that our sampling rate frequency is lower than $f_h$, and is not any multiples of ...
0
votes
1answer
18 views

How to detect an event of interest within a given signal?

I have EMG signal(bio-medical data, recording of limb movements) and i want to detect an event of movement in it. What are the methods available to identify?
0
votes
1answer
40 views

Derivative Notation as a factor

In the figure below, from the book "Principles of Linear Systems and Signals - Lathi", the author uses the notation D to replace the Leibniz's notation $d/dt$, and after that he rewrites the equation, ...