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0answers
5 views

Multivariate Wavelet

I am new in Digital Signal Processing.I am working with wavelet but I do not have source code for multivariate wavelet decomposition for 1D data.plz any body help me on this.
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1answer
13 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
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0answers
26 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
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0answers
16 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 ...
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0answers
23 views

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

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
33 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 ...
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0answers
31 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
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1answer
13 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 ...
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1answer
47 views

How is functional analysis linked to digital signal processing

I have run into several documents that discuss the importance of functional analysis to digital signal processing especially in the domain of sampling and compressive sensing. Yet I have not seen ...
0
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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!!
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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 ...
4
votes
2answers
125 views

Physically what is phase term means for multidimensional signal?

I want to ask very basic question related to multidimensional signals like an image or a video signal. What is phase term means for multidimensional signal like an Image or video signal(like for ...
1
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1answer
78 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
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2answers
148 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
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0answers
11 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 ...
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4answers
368 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) \ ...
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0answers
16 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
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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 ...
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1answer
42 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 ...
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0answers
23 views

How to normalize pwelch output and calculate band power using it ? . In matlab

I am using , [pxx,f] = pwelch(x,window,noverlap,f,fs) , to compute power spectrum of a EEG signal . I have to calculate band power in 1Hz frequency bands in 4-30Hz , using Hamming window , with 50% ...
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0answers
16 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
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1answer
30 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, ...
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0answers
26 views

Classification SVM

I have a problem with Support Vector Machine classification. I have two classes of children (boys and girls). I use a MFCC function for training (for each class I have 24 coefficients, number of ...
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0answers
13 views

Frequency function $Y(\omega)$ and Spectrum $\Phi_{y}(\omega)$ difference

What is the difference between a frequency function of a signal $Y(\omega)$ and the spectrum of a signal $\Phi_{y}(\omega)$ ?
0
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1answer
30 views

How to prove: high-slope/more change is high freq part of signal

Generally, everyone knows that "the part of signal with high-slope is the high frequency part." What is the definition or theory behind it? How to prove this well-known thing? perhaps, I miss ...
0
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1answer
20 views

What is spatial correlation?

What does the spatial correlation of a signal say about it?How is it different from autocorrelation? `
0
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1answer
55 views

Calculating FIR filter coefficients with the windowing method and Convolution algorithm [closed]

Please advice how to calculate FIR filter coefficients with the windowing method using the Rectangular Window function and convolution method? What utility or FIR design application can perform this ...
0
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0answers
38 views

Calculating SNR for ECG signals

I'm reading through the literature for finding the best way to calculate SNR for a ECG signal. While there are many algorithms for improving SNR, I couldn't find any that details any standard ...
0
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0answers
11 views

What is the best way to detect audio drops (audio level drops irregularly) in a video?

While recording a video, due to some problem in microphone (like low battery ) audio level go down inconsistently (voice____Voice__), I am trying to figure out an solution for this, is there any way ...
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0answers
45 views

How to define cyclic frequency for cyclostationary signal in terms of signal parametrs?

I am trying to detect cyclostationary signal. For that it is required to know its cyclic frequency. But I am unable to figure out how it can be related to signal parameter. Is it possible to define ...
0
votes
1answer
79 views

aliasing to a 50 Hz sine wave sampled at 5000 Hz sampling rate?

I sampled a 50Hz sine wave (its not perfectly a sine wave, it's a data coming from current sensor using Arduino). Using real time graphing technique by sending the data from Arduino to the PC I ...
1
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1answer
44 views

Detect repetitive units within signals

I have several signals that consist of repetitive units. In the figure you'll clearly see the variability of the signals, that increases top down. The first signal is super repetitive and units are ...
1
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1answer
37 views

The two types of stability and “Why exponential”

When I was learning about LTI systems, I noticed that LTI system is said to be BIBO stable if and only if its square sum of impulse response is finite. This expression is found on many textbook of ...
0
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1answer
26 views

What type of sensors have complex Gaussian noise?

What type of sensors have complex Gaussian noise? Do strain gauges also exhibit such noise?
1
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0answers
40 views

How to process the .wav file to get meaningful information like the number of inhales/exhales

The plot of the data from the wav file. Link to the sound file - https://drive.google.com/open?id=0BxAPlY66uX7qWWtDZUw3WkpjSGs&authuser=0 Also the FFT plot is like this I am new to the field ...
0
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0answers
10 views

Transposing pitch profile of one audio on another

I have one audio file with rap music and one audio with sound record of my friend's reading some text. I want to transpose pitch profile of rap music on sound recording, is that possible? I can ...
2
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5answers
131 views

How to design a narrow band pass filter without DSP toolbox

I've two signals X and Y. These are proximity sensors reading measuring vibrations of a rotating shaft. Now I want to plot orbit plots for these signals. I can plot unfiltered orbits with just X and ...
0
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0answers
10 views

Calculating Dynamic Time Warping

I am trying to implement a DTW algorithm but I keep getting infinity as the result. I implemented three functions - DTW which is the actual algorithm, ...
0
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0answers
9 views

Wavelet packet transform (WPT) features dimensionality

Just a question that could be trivial for someone but I'm doubtful. Let's say that I have a signal, e.g. electromyography signal, of length $300$. If I apply a WPT, how can I define the dimensionality ...
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0answers
37 views

Interpretation Of 4th-Order Cumulants For Complex Signals

For complex signal $y(n)$, we have the following three 4th-order cumulants: $$ \begin{align} C_{40} & = \operatorname{cum} \left( y(n), y(n), y(n), y(n) \right) \\ C_{41} & = ...
1
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1answer
51 views

Sinc Interpolation implementation in Matlab for reconstructing or interpolating?

I am working on my project and I need to have a Sinc Interpolation function for a real world image. But, it seems that I have not caught the concept of Sinc interpolation. Could some one help me with ...
0
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2answers
22 views

Does $ Ev(\cos(4\pi t)u(t)) $ signal has period?

According to Oppenheim's signal and systems solution book and other solutions like this $$ Ev(\cos(4\pi t)u(t)) = 1/2 \times ( \cos(4\pi t)u(t) + \cos(4\pi t)u(-t)) = 1/2(\cos(4\pi t)) $$ $$ ...
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0answers
11 views

DIrectional data in image

What is mean by directional content as perceived in Contourlet transform of image/signal processing? Wavelet transform cannot capture directional information.
1
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1answer
20 views

Must OFDM signal be time-division in a multiple-transmitter and SFN system when the signal is free of spread-spectrum?

The OFDM baseband signal can be demodulated since each subcarrier is orthogonal to another. But In SFN system, i.e., Single Frequency Network, all OFDM signals from several transmitters are in the ...
0
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0answers
45 views

To what extent is it possible to to determine whether a phone call is local or long distance by analyzing the audio?

We have a recording of a phone call which contains some echo. We would like to determine the distance between the 2 people who spoke. The issue is explained here: ...
0
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1answer
60 views

Why are MFCCs of two equivalent signals completely different?

I have an audio file, of which I calculate 16 (actually 15 because I omit the first one) MFCCs in R. When I stream this file via VLC-Player and Icecast2-Server, receive it in Java (with the Player of ...
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votes
1answer
41 views

Feature extraction for sound recognition and classification

I am building an application that would "listen" to the microphone input, analyse it, and compare the analysis to a pre-analysed and pre-classified sound bank (small - maximum 20 sounds). It will then ...
4
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3answers
166 views

Processing Accelerometer Vibration Data With FFT

For a project I am attempting to use an accelerometer to measure vibration in an RC aircraft and determine frequency from the result. To do this I am using an MPU-6000 accelerometer sampling @ 1000Hz. ...
0
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1answer
45 views

Kiss fft does not work after giving it more than 32 samples

I am trying to take data from an accelerometer and apply Kiss FFT to the samples. I'm using a Freescale Kinetis FRDM-K22F board. I want to use 64 samples, but when I run the program I get an error ...
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1answer
35 views

Compute Similarity between Fourier Transforms

I'm looking to compare the Fourier Transforms generated by accelerators and gyroscopes that collected data of people walking. I've looked to see if there is a standard form of comparison, but I have ...