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0answers
23 views

Why is the term deconvolution used more for signals and not so much (or at all) for systems?

Wikipedia defines mathematical deconvolution here, and with the examples given and my experience, what I've read over the years is that deconvolution is used to determine an input signal provided a ...
3
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1answer
200 views

What do you call it when you add zeros between the elements of a vector?

What do you call it when you add zeros between the elements of a vector? let's say you have x =[1 2 3 4] and ...
1
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0answers
12 views

How is per-class rate defined?

I've recently read the following For our pixel labeling, consistent with [20], we report the number of pixels correctly classified (per-pixel rate) and the average of per-class rates. The per-...
0
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0answers
27 views

Audio mixing from 2 Microphones using java

Here's my situation, 1, I'm getting audio data for playback from network in byte array format 2, When I speak using 2 microphones near by to each other, I can hear what I'm saying but the problem is ...
0
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1answer
36 views

Terminologies: Adaptive, recursive and iterative

Considering non-linear filtering technique like Extended Kalman filtering with Expectation Maximization (EM). EM is an iterative technique but what is Kalman filtering? Is Kalman Filtering called ...
3
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2answers
629 views

What does 'canonical' mean?

What does 'canonical' mean? e.g. 'write IIR or FIR in canonical form' I get the gist of it but maybe someone here has a precise definition. In a non-DSP context it would mean something like '...
0
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1answer
29 views

Terminology: source and target

How should one choose between the words "source" and "target"? This video processing plugin from Sony Vegas tries to match the color of one video to the color of another. It got me confused because I ...
1
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1answer
62 views

Beginner level : Help with terminologies : smooting length, length of channel, channel equalization delay, blind system identification, equalization

Say the channel model is an univariate FIR filter with true coefficients $h=[1,a_1, a_2 ]$. I am learning algorithms for system identification and channel equalization. For this, I am implementing ...
3
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1answer
41 views

Sinusoidal Wave Terminology

Suppose I have a sinusoidal signal of the form $x(t) = a\sin\left(2\pi b(t-c)\right) + d$. I understand $a$ is the amplitude, $b$ is the wave number, and $c$ is the phase shift. I know that the term ...
0
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1answer
51 views

Subsampling data: terminology

I'm writing software and the data reporting frequency is slower than the acquisition cycle, so effectively sub-sampling is being done. Different data types require different methods of sub-sampling ...
0
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1answer
83 views

What does “warp” mean in DSP?

I hear the word warp a lot, but cannot quite get a feel for what it really means I suppose it's literal meaning would be to change in shape, but what does it mean with respect to DSP? More ...
2
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1answer
64 views

Sampling distance

In paper: A. Vlad, A. Luca, and M. Frunzete, "Computational measurements of the transient time and of the sampling distance that enables statistical independence in the logistic map," in Proc....
3
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1answer
94 views

Difficulties in understanding mutual information concept

What does mutual information (MI) convey? If 2 signals are independent then MI is zero; What does this imply and mean in the case of mutual information of error, and in general definition of MI and ...
0
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1answer
40 views

Sample vs. sample values

Is there any difference between the terms sample and sample value in DSP? In statistics, those are very different concepts: a sample is a subset of a population: it is a set of random variables. A ...
6
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3answers
469 views

What does it mean exactly when two parts of a signal are correlated?

I stumble quite often upon the notion that two or more parts of a signal are correlated to describe semi-formally that they belong together. For example in image processing, two pixels on an edge ...
0
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1answer
158 views

Proper meaning (and origin) of PCM (pulse code modulation)?

(copy from Proper meaning (and origin) of PCM (pulse code modulation)? - Stack Overflow): Apologies first, as StackOverflow is possibly not the right forum for this question; in that case please ...
0
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1answer
44 views

Is applying a gaussian kernel a fancy way of saying convolving with a gaussian mask?

When someone says apply gaussian kernel, is that the same thing as saying, convolve it with a gaussian mask?
0
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1answer
129 views

Is “early vision” chronological or process

This might sound silly, but I have a language barrier type of question, and I was hoping someone could clear up this misunderstanding: I've seen the term "early vision" several times in papers I've ...
1
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2answers
2k views

White noise vs. delta pulse and Ultraviolet catastrofe

Everybody explains that white noise has all frequencies equally strong. But, this immediately means that Ultraviolet catastrofe inevitably happens if power > 0 stays constant at any frequency and, ...
6
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1answer
1k views

Scalogram (and related nomenclatures) for DWT?

My understanding of the scalogram is that, for a particular row, the scores of the projection of the input signal with the wavelet at a particular displacement is shown. Across rows, the same thing ...
4
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1answer
779 views

What does double hat mean in Spectral theory?

I was confused about the double hat notation $\hat{\hat .}$ and my teacher and I thought it probably means an estimate of an estimate most of the time, but we could not be 100% sure of its meaning. ...
2
votes
1answer
110 views

What does orthogonality mean in the context of adjacent channels in a filter bank?

First off, what does orthogonality mean in the context of adjacent channels in a filter bank? Secondly, I am reviewing some code in which the dot product of the transfer functions of adjacent ...
10
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1answer
6k views

Terminology: spectrum, spectrogram, spectrograph, sonogram, etc

In term of proper or accepted naming conventions of DSP graphics or instrumentation output, what is the difference between the words spectrum, spectrogram, spectrograph, and similar terms, and what ...
4
votes
1answer
180 views

Is there a “first” Fourier transform?

Every time I've read "first Fourier transform", I've assumed it to be a misspelling of the fast Fourier transform. Recently though, I saw the term in both the title and keywords of an article from a ...
5
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2answers
4k views

What is the relation between the PSDs of filter input and output called? $R_Y = |H|^2R_X$

If a wide-sense stationary signal $X$ is fed to an LTI filter with the transfer function $H$, the power spectral density (PSD) of the output $Y$ can be expressed as: $$R_Y(f) = \left|H(f)\right|^2R_X(...
13
votes
1answer
3k views

What's the difference between the Gabor and Morlet wavelets?

The Gabor wavelet is a kind of the Gaussian modulated sinusoidal wave (source)   Gabor wavelets are formed from two components, a complex sinusoidal carrier and a Gaussian envelope. (...