Questions tagged [soft-question]
questions that are soft in nature, generally not related to implementation
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Does generalized sidelobe canceller (GSC) differs for non-uniform array?
As I understand Linear Constraint minimum variance (LCMV) beamforming weights can be expressed as a solution of a convex optimization problem.In this case we have cost a function to optimize and there ...
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Why expected value is optimal?
The expected value is widely used and considered optimal. The question is why it is optimal. The Wikipedia page or other google search on the topic does not clearly state why and under what condition ...
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Comparison between convolution filter and spectral division filter?
Consider a signal $x=s+n$ where s is the desired signal and n is the noise we want to remove. If we know that noise is just low frequency we can remove noise by designing a low pass filter say $w$ and ...
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Fourier Transform of the conjugate of a complex function [closed]
Given that $x(t)$ Fourier Transforms to $X(f)$. What happens when you Fourier Transform $x^*(t)$, and your $x(t)$ and $x^*(t)$ are both complex functions??
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Illumination Normalization Paper: Help understand equation
I hope this is the right place to post this question.
Im reading a paper titled "Illumination Normalization Based on Weber’s Law With Application to Face Recognition"
Im only interested in ...
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What do you call the random Gaussian vectors in compressed sensing?
Let $(e_i)_{1\leq i\leq M}$ be vectors with zero-mean i.i.d. entries from a Gaussian distribution. In a compressed-sensing setup, I have observed the collection of scalar products $(\langle x\, |\, ...
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Radar type application for narrow band only?
Not sure if this is the proper forum to ask this question, but still I am trying my luck.
I am looking for an application (in any area, medical, defence, or any other area) if exist, such that we want ...
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What helped you in reading and implementing papers and coming up with original ideas in computer vision/graphics?
I'm trying to get into academic research at the intersection of vision and graphics, and was wondering how researchers in the field went about this:
Was it useful to do a lot of fundamental math ...
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Is there a term called "Fourier Beamforming"?
I understand delay and sum beamforming, where we want to add the signals obtained from different sensors. But adding different time samples from different element of the array depending on the angle ...
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Use Cases of FFT in Signal Processing [duplicate]
I am trying to learn about signal processing and fft's applications within it. My understanding is that a classical use case for fft is to remove "noise" (ex. high frequencies that are not supposed to ...
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Does 46 dB gain of a filter for a frequency imply 200 times more amplitude?
Consider we have a IIR filter or order 2 and it has gain of say 46.02 dB for frequency $f_0$. Now if we apply a time domain signal of frequency $f_0$ to the filter for a long time, can we expect to ...
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Given a impulse responce can we derive a state space model?
One can find may examples of how to find the impulse response given a state- space model (A,B,C,D). Is the inverse defined properly i.e given a impulse model can we derive the discrete-time state ...
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Matched Filters for attenuation detection?
I have been reading about matched filters and I'm interested in possible uses for them,
I have seen they are used very often in radar, in such a way that you send out a signal, and then you read the ...
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Is there a hypothetical situation where once can use Wiener filter prior Matched filter to get better result?
Is there a hypothetical situation where once can use Wiener filter prior Matched filter to get better result? Mostly I am looking for an example or a situation where both the filters are required as ...
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Is there a noise cancellation technique for over-lapping spectra?
I understand Wiener filter is used to reduce noise, Gaussian noise as well, once we give the noise characteristic. One may derive the filter coefficient in adaptive way as well But can it remove noise ...
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Can we band pass filter QPSK signal?
Consider we have QPSK signal with carrier frequency 10kHz. Generally, we demodulate or use matched filter on the the QPSK signal and recover the transmitted bit or the symbols. If the QPSk signal is ...
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Overview Noise Reduction Techniques
I am trying to learn signal processing and when I research about ways to reduce noise in different situations it's so easy to get lost in one solution or go down the wrong path
for example, is your ...
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Why do mobile phone calls produce a vibration when they are near a speaker?
I remember that years ago when I had a classic mobile phone (the small one without touchscreen) when I was about to receive a call from someone and my phone was near a speaker, the speaker would start ...
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System Response Terminology
If I have a system specified by
$$P(D)y(t)=Q(D)x(t)$$
and I specify initial conditions $y(0^-)=a, \ y'(0^-)=b,\ x(0^-)=c$ does the term $x(0^-)=c$ correspond to the zero state response or zero ...
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Is match filter a solution of some differential equation?
Matched filter is very common and termed as optimal filter for detection purpose. The question is : can we formulate a differential equation and show that the solution is matched filter.
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Good Continuing Education Course in the Basics of Frequency Analysis
All,
Are there any good continuing education courses of length 2-3 days to give an engineer a good background in Frequency Analysis. B&K used to teach one, but I don't think that they teach it ...
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From Mathematics to DSP [closed]
I'm currently working on multiple mini pet-projects in my spare time, grounding myself in the basics of audio signal processing, and trying to develop algorithms for polyphonic pitch detection. As I'm ...
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How does the assumption that symbols are equi-probable hold
If I draw a number uniformly between zero and one, what is the probability that they are equal? Mathematically, it should be zero but I don't recall why? Can somebody please help in explaining why the ...
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Origin of brightness artifacts in intensity resolution compressed images
when compressing this image
(It corresponds to Fig2.20 from the book Digital Image Processing by Gonzalez and Woods and the original .tif document can be downloaded through this
link
By reducing ...
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Does receiver always know about the noise level in real world application?
In many research articles, the effect of measurement noise on estimation performance is often reported. But it is not clear to me what is the proper way of using the signal to noise ratio (SNR). For ...
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What is the difference between entropy and entropy rate and which one is important in information theory? [duplicate]
By entropy I understand the uncertainty or randomness. But if the uncertainty is high then what is its implication and advantage in transmitting information or as an information source or is high ...
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How broad is one DSP engineer's knowledge scope?
How broad is one DSP engineer's knowledge scope?
What I'm trying to understand. How many engineers are needed to develop for example some musical DSP application? For example a digital effects unit.
...
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Does a simple photograph contain more information than a complex painting?
I hope this question is appropriate for this site.
I came across this passage in The Three Body Problem, a novel by Liu Cixin:
The professor had put up two pictures: One was the famous Song ...
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Signal processing research idea [closed]
I am a graduate student in applied math, specializing mostly in harmonic analysis. My undergraduate studies were mostly in pure math but I realized I prefer the applied/computational side. I was ...
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Synthetic sounds to describe motion in 3d or 100d
Watch a butterfly flitting about, or an optimizer chugging along in 3d or 100d --
a sequence of points $X_1 \ X_2 \ X_3\ \ldots$
How could one generate synthetic sounds that convey
moving fast or ...
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Seeking compressive sensing imaging demo in MATLAB
I am looking to experiment in MATLAB with image restoration/reconstruction using compressed sensing. I am relatively new to compressive sensing, and was inspired by the following Wired article to ...
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What are your tips for DSP self-study?
Perhaps a meta-question, but I'll post it here because some of you are bound to possess gold nuggets about continuing education. It might be closed for being subjective but I don't care because this ...
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What tools do you use to create signal processing plots?
I am in process of creating some notes in Latex on signal processing.
such as
Does anybody know if there are softwares or tools that are useful for quickly generating these diagrams?
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Is DSP a branch of Computational Science? [closed]
The way I understand it, computational science covers a wide range of fields, all of which use computers and mathematical models to solve a problem involving one of the sciences (physical, life etc.). ...
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Reliable peak picking algorithm?
I've written an application that estimates pitch based on autocorrelation function. I did peak picking by comparing vector values to determine whether the central one is a peak or not, but this method ...
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What are the minimum knowledge required to begin the study of Digital Signal Processing?
I am a student of computer science (not the university but technical school).
I am interested in the world of DSP, and I saw that it is closely connected with mathematics. I noticed for example that a ...
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So is there such a thing as a DSP engineer nowadays? [closed]
I just read the article linked to below:
http://www.eetimes.com/document.asp?doc_id=1275520
Now, I'm planning on doing a Masters in Signal Processing. I'd like to know what the career prospects are ...
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Relation between Kalman filter and Sequential linear MMSE estimation
Are the results of applying Kalman filter and recursive linear MMSE estimation process the same ?
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Getting stuck into an open source image processing/computer vision project
I have a degree in Electrical Engineering (focusing on VLSI). However, I am more mathematically minded, and only recently discovered that image processing seems to contain lots of interesting maths. I ...
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Representation of frame image pixels
In paper Human identification using gaits Section 3.2, the authors explain how to represent a 3D image (x,y,t) into 2D image with (x,t) ; (y,t) denoted 1D signals. I have a conceptual doubt which is ...
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Career in computer vision
I apologize if this is not the appropriate site or the appropriate type of question, but I didn't know where else to ask. If it is, please inform me to delete the question.
I took a year in college ...
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Are there characteristics of photographic film that would make it an analog medium?
There was an article a few years ago entitled "Analog is Not the Opposite of Digital".
Film is not analog, period. I used to shoot film on a Canon AE-1 from the ’70s. Now I have a digital ...
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I and Q Channels
My understanding of I and Q channels is as follows (please correct me if I am wrong):
I = In-phase, or real component
Q = ...
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Test data vs. training data
I am reading bishop book on pattern recognition and machine learning. Going through the introduction section, I am not sure if I get the differences between the two widely used term "test data" and "...
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A (Clear) Line Between Computer Vision and Image Processing
I have been working in and learning about both Computer vision and Image processing for a few years now, and I believe that I am not a complete beginner any more.
Still, after all these years, it is ...
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How to remove color cast from HSV information
I have hue, saturation and value of a color (HSV color-space). The color has to be set on a device that displays them incorrectly. If I specify white it displays light magenta. However, if you specify ...
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XDR data format
I have binary XDR data file representing radar data. What is XDR data formatting? What is useful for? How to visualize this binary file? Is there any kind of software that converts this data format in ...
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Are there any open source biomedical signal processing projects?
I'm in a biomedical engineering master's program and am mostly interested in signal processing. Unfortunately, I feel that I'd like to get deeper into the subject, and my university can't accommodate ...
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What Resources Are Recommended for an Introduction to Signal Processing (DSP)?
What are some recommended resources (books, tutorials, lectures, etc.) on digital signal processing, and how to begin working with it on a technical level?
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Introduction to Statistical Signal Processing
There is a postdoc in my lab whose specialty is "statistical signal processing". He has a PhD in Electrical Engineering and he analyzes the neural data collected.
I am wondering what courses/topics I ...
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