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1500 questions
8
votes
1 answer
Apply wavelet transform to analyse EEG signal
I would like to apply The Morlet wavelet transform to analyse my EEG signals. I have many short signals each is only 1 min long. and they all recorded in 30Hz.
I have Two questions:
In the Morlet wavelet, What is the best scale (alpha) to use in…
Dov
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8
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1 answer
Unit Problem in Designing a Filter for a Given Auto Correlation Function
Given a WSS process with the following Auto Correlation Function:
$$ r\left ( \tau \right ) = {\sigma}^{2} {e}^{-\alpha \left | \tau \right |} $$
The Laplace Transform would be:
$$ R \left ( s \right ) = \mathfrak{L} \left \{ r \left ( \tau \right )…
Royi
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8
votes
3 answers
Eigenvalues and Eigenvectors of a 3D Image Laplacian
I need to compute the eigenvalues and eigenvectors of a 3D image Laplacian. I'm trying to evaluate the heat kernel on the 3D uniform grid (the uniform structure generated by the voxelized image) at different time values, to implement a Volumetric…
Federico
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8
votes
1 answer
How one apply correctly FFT in image denoising
I'm writing program (Qt widgets/c++) for removing noise from images. As denoising method, i selected non local means method. This method has incredible quality of restored images (that's why it's the only denoising method in OpenCV), but has huge…
Shf
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8
votes
3 answers
Mathematically Inclined Signal and Systems / Signal Processing Book Recommendations
I'm an electronics engineering student with high inclination to analysis and pure mathematics. I was just wondering if there was any book ( or any resource ) that treats signal and systems and signal processing with a lot of mathematics rigour (…
nerdy
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8
votes
1 answer
Measuring time delay of audio signals
Before anyone yells at me I fully realize that this question has been asked numerous times. I assure you that I've read through the existing questions and answers but I am still confused about part of the problem.
I have a sound source that plays…
CaymanEss
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8
votes
1 answer
Coloring a waveform with spectral centroid or by other means
Update 8
Unhappy of having to upload tracks to the service and looking at the new release of RekordBox 3 I've decided to take another look for an offline approach and a finer resolution :D
Sounds promising though still in a very alpha state:
Johnick…
Eric Cartman
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8
votes
1 answer
What is the adjoint of a linear operator and why is it useful?
The concept of linear operators and their adjoints arises frequently in some corners of signal processing, but is not particularly well documented, at least from a signal processing perspective (you could probably find a decent amount of more…
Gillespie
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8
votes
2 answers
Recording and playback of sound, frequencies question
If I record a sound at a rate of 8000 samples per second I know that the highest frequency that can be reproduced from the sound is 4000 Hz. What I want to know is;
If the sound contains frequencies above 4000 Hz when I play the sound
back what…
Sami
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8
votes
5 answers
Solving Inverse Problem of Multiple Pulses Over Multiple Channels with Convolution Kernel and Cross Channel Mix
Before I start, let me note that I have 0 experience with signal processing, so please bear with me:
My System
My system can be represented as an $m \times n$ matrix $X$ (input) where each
column represents a "channel" and each row represents…
Daniel Duque
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8
votes
3 answers
“Subtracting” one audio stream from another audio stream
I am a long time software engineer but have practically zero experience with signal/audio processing. I am interested in learning about signal processing via a use-case we have for one of our audio components. NOTE: this is just a learning exercise…
CaymanEss
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8
votes
3 answers
Calculating similarity between two signal plots
I have two plots, each having frequency as x-axis and Gain as y-axis. By taking one data set as a reference I have to calculate similarity between them.
The graphs have same values on the x-axis and have same range on the x axis
Can 2D Correlation…
Animesh Pandey
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8
votes
1 answer
Impulse vs Step response
What is the difference between an impulse and a step response diagram?
20317
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8
votes
2 answers
Detection of lines in a point cloud
What are the best solutions to detect line in a point cloud? Comparison being made with and between Hough Transform, Radon Transform, RANSAC (see wikipedia) and Brute-Force Search (see wikipedia).
Which one is the most robust against the dispersion…
Developer
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8
votes
6 answers
Why color is coded with two numbers rather than one?
I was thinking why color spaces use two numbers to represent color: Lab, HSV, HSL? Is it possible to use one number and have the same or very similar properties when comparing colors as we have for two number color representation.
I read the…
ivan_onys
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