Computer Science Stack Exchange
Computer Science Stack Exchange

Questions tagged [signal-processing]

For questions about processing data from sensors (e.g., audio and video data), and not handling operating system signals. Note that there is also a dedicated Signal Processing Stack Exchange, which may be a more appropriate venue.

For questions about processing data from sensors (e.g., audio and video data), and not handling operating system signals. Note that there is also a dedicated Signal Processing Stack Exchange, which may be a more appropriate venue.

27 questions
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What are all the differences between the Gibbs phenomenon artefects and JPEG artefacts?

I thought the Gibbs phenomenom is the result of Fourier analysis estimation (but was it Fourier Series estimation or can it also be Fourier Transform estimation?) JPEG uses the Discrete cosines Transform. A DCT is similar to a Fourier transform in…
Higgins
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Which algorithms are usable for heatmaps and what are their pros and cons

This is a cross post from Stack Overflow, and DSP at Stackexchange since I cannot really decide which part of Stackexchange is most fitting. If this is the wrong place please tell me and I'll remove the question. I have a matrix with numerical data.…
Einar Sundgren
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4
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2 answers

Continuous Mutual Correction from Multiple Sensors

I'm stumped on what exactly to search for; so here is a non-scientists description of the topic. I've got multiple sensors of different types that are measuring the same physical value in different ways. The sensors are all subject to significant…
justinzane
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1 answer

What is the signal going from the computer to the screen?

Im sorry if it is a weird question, but I cant seem to find an answer for this. What does the signal going to the screen look like in more abstract sense? Does it code the values of each pixel in a huge matrix, is it a computational stream that…
Sevenius
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3
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Algorithms that are similar to Dynamic TIme Warping

Dynamic time warping (DTW) is an algorithm in time series analysis for measuring similarity between two temporal sequences which may vary in time or speed. Here are some explanations of DTW: Dynamic Time Warping by Wikipedia Dynamic Time Warping by…
askingtoomuch
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1 answer

How do I take the average of multiple Fast Fourier Transforms?

How do I take the average of multiple fast Fourier transforms (ffts)? I have multiple audios that I want to take the fft of and then average these results to smooth out the random noise that appears in each audio. The ffts of the audios are shown in…
MicroscopicPie
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generalized translation operator on graph

David IShuman in " vertix-frequency analysis on graph" claims that,"we generalize one of the most important signal processing tools – windowed Fourier analysis – to the graph setting and When we apply this transform to a signal with frequency…
niloofar jamshidi
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1 answer

Compare phase and magnitude spectrum results of 2 Images

I have read that from Fourier transform we obtain magnitude and phase spectrum. The magnitude spectrum tells you how strong are the harmonics in a image and the phase spectrum tells where this harmonic lies in space. I have used Matlab to compute…
pandu
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2
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Stream processor definition

I'm looking for an actual definition of a stream processing unit (SPU), preferably sourced. The context is not specifically graphics cards. I can find many, many articles explaining what they contain, or what they do in specific cases, but I need a…
user234461
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Generate higher dimensional pink noise

1D Pink noise, is easy enough to generate. See https://www.dsprelated.com/showarticle/908.php for example. What about higher-dimensional pink noise, such as 2D or 3D pink noise? Is there an algorithm to generate that? EDIT: One approach might be to…
Christopher King
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Help understanding an audio processing algorithm

I'm reading “Speech segmentation without speech recognition” by Dong Wang, Lie Lu and Hong-Jiang Zhang. The algorithm I'm looking at is a V/C/P (Vowel/Consonant/Pause) classification algorithm on a digital speech signal. It is described as…
YoungMoney
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Compute unknown matrices that minimize a sum

This problem is about working with smart-phone accelerometers. To calibrate accelerometer, I need to find three unknown matrices T, K and B that minimize this sum: $$\sum_{i=0}^N(|g|^2 - |TK(a_i + B)|^2)^2,$$ where $a_i$ is a known 3x1 vector and…
HsnVahedi
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Does the illumination color (red/blue/green) has any effect over the disparity map generated from a stereo image?

I have a working model that creates a disparity map using stereoscopic image processing using opencv. I am thinking of improving the disparity map by using illumination and stuck with different options in the light colors. I want to know if the…
Sai Bharadwaj Appakaya
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Understanding Dynamic Frequency Warping (not Dynamic Time Warping)

I am implementing a paper which need Dynamic Frequency Warping as a component. They have written very briefly about this algorithm and cite to this paper: Voice transformation using PSOLA technique (page 9/13 of the PDF, section 3.3). I have read…
enamoria
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0
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spike/peak removal/interpolation

I have some signals that look like following: I would like to remove the two peaks by doing linear interpolation, so I can get something like this: where the orange line segment should replace the two peaks after the interpolation. I understand…
Nick X Tsui
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