Questions tagged [terminology]
For questions about words, phrases and definitions that are specific to signal processing.
105
questions
0
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0answers
47 views
What is a Transfer Function to the System? State Characteristics or State Properties
GIVEN: in linear 1DOF mechanics / vibrations processes, ones that characterize a system’s state variables (position u & velocity du_dt) as effected by a causing force f.
Simply: $f= m\cdot {ddu}_{...
0
votes
1answer
36 views
Digital, continuous and the state term [closed]
If a digital system has two or more modes (states), does a continuous system have just one mode (state)?
1
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1answer
72 views
What exactly is meant by "translation invariant dictionaries/wavelets"?
I'm trying to wrap my head around the notion of translation invariance in terms of dictionaries/wavelets. For example in Lecture Notes, Page 41 its written that one starts with a family of atoms/...
2
votes
1answer
562 views
What do Signal Processing experts do, in essence?
I want to understand what Signal Processing experts do in their professional work, in essence.
I was thinking about:
Sampling signals
Receiving signals by machines
Broadcasting signals by machines
...
-3
votes
1answer
43 views
Is receiving a signal the same as sampling a signal?
Is receiving a signal the same as sampling a signal?
When a person or a machine "receives" a signal, is that the same as "sampling" it?
0
votes
3answers
72 views
Why does the term "discrete" usually appear near the term "digital?"
Are these terms just parallel words? If not, why is it that when one reads about the first then one is very likely to come across the second? In such case, what would be a nice example to explain the ...
-1
votes
2answers
78 views
What is the consensus about what is a signal? [closed]
I know that "what is a signal?" is a matter of opinion, but I hope to find out about a consensus.
Is for example, by consensus, a signal is:
A sampled wave
A sampled mass
A sampled energy (...
-1
votes
2answers
66 views
Are signals modeled either digitally or analogously or can signals modeled as both?
Are signals modeled either digitally or analogously or can signals modeled as both?
0
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1answer
37 views
Difference between the courses "Digital signal processing" and "Real Time Digital signal processing"?
Different universities around the globe offer DSP courses with different names
Especially some name the course "Digital signal processing" and some name "Real Time Digital signal ...
0
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1answer
31 views
Confusion understanding phase shift/delay?
I am reading proakis, as shown highlighted in attached snap shot,there is '-'sign along with j,but still it is written (underlined red) implies shift in positive n direction,why and how positive?when ...
0
votes
2answers
38 views
Digital Signal Quantized Processor Complexity
In “traditional” digital signal processing, the complexity is computed as a number of multiplication the operation requires, e.g. the computation of the N-point DFT via the decimation-in-frequency FFT ...
0
votes
1answer
19 views
What is difference between "Direct form" and "Normal Direct form"?
What is difference between "Direct form" and "Normal Direct form"?
I was reading about filters implementations(structures) and found out both words "direct form"and "...
0
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0answers
22 views
Confusion regarding terminology?
While studying the topic of filter design,i came across following terms:
1)Factored form
2)SOS(second order sections)form
3)Rational form
4)Transfer function form
What is the difference between all ...
1
vote
2answers
71 views
Up sampling vs down sampling,?
Refrence wikipedia article for upsampling and wikipedia article for downsampling
Upsampling , interpolation and expansion are described as synonyms
While
Downsampling , decimation and compression ...
1
vote
1answer
223 views
Zero order hold interpolation and Nearest-neighbor interpolation?
Is there any difference between Zero order hold interpolation and Nearest-neighbor interpolation
I want to perform zero order hold interpolation in MATLAB,but there isn't any information about zero ...
1
vote
1answer
2k views
What is formula for quantization step size?
I have read from different web links,different formulas of quantization step size as shown highlighted in attached snapshot,but what is actual/correct formula?
7
votes
3answers
681 views
Is there an adjective describing a filter with kernel that has zero mean?
A linear filter with a kernel that has zero mean could be thought of as a "DC-rejecting" filter. Is there a better or more commonly used adjective for such a filter?
0
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0answers
36 views
Why is the rectangular window called 'rectangular'?
In what way does it have a rectangular shape? Does it have something to do with a polar-coordinates graph?
0
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0answers
29 views
"Reflected added to self" - word for it?
x += x[::-1]
I thought "reflect-superposed", or "reflect-added" ... any formal term for this? e.g. with linear chirp:
2
votes
1answer
33 views
Most generally-accepted audio term, for "pre" and "post" lengths of a symmetric filter's impulse response?
Consider a FIR audio filter with symmetric impulse response.
In my case, the filter kernel width is 15 frames on each side (so including the center frame, 31 frames total). When examining the audio ...
0
votes
2answers
63 views
What specifically does PCM refer to?
What specifically is PCM? I've seen it refer to:
the sampling and quantisation of an analogue domain signal into digital samples
those sample quantisations alone in the digital domain i.e. in memory ...
0
votes
0answers
35 views
DFT algorithm designed for a "sample-by-sample" senario
Suppose I have a system that wants to take an input signal (audio in this case) and wants to output a Discrete Fourier Transform of it in real time (ie every sample).
My initial thought is that if you ...
2
votes
3answers
274 views
Confusion understanding digital signal processor?
I am reading wikipedia article about digital signal processor and as shown in end of attached snapshot
." Most general-purpose microprocessors can also execute digital signal processing ...
4
votes
1answer
101 views
Conceptual Questions on Colored Noise Process
I am having a tough time finding answers to some specific questions and finding references where there is information regarding Brownian noise or Red Noise. I'm referring to white and colored noises ...
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1answer
333 views
Meaning of monotonic in context of filters?
What is meant by "monotonic" in context of filter
As shown in attached snapshot
3
votes
1answer
207 views
Is linear convolution same thing as aperiodic convolution?
I am reading an online article and what i understood from there is that linear convolution is aperiodic
Is it right?
I have also attached snapshot and higlighted two instances
0
votes
1answer
128 views
Kernel vs impulse response: what's the difference? [duplicate]
I am reading The Scientist and Engineer's Guide to
Digital Signal Processing by S.W. Smith. In Chapter 9: Applications of the DFT in the 3rd paragraph he writes "kernel (impulse response)"
...
0
votes
1answer
54 views
Confusion regarding notation/symbol?
I was reading circular convolution topic from Digital Signal Processing Using Matlab 3rd Ed,by Proakis. I came across a strange term/symbol; I have highlighted it in attached snapshot
Update:Pg150; ...
0
votes
1answer
716 views
Combiner vs mixer vs coupler?
All these three terms are often used in communication texts and apparently they are some how similar
But what is exact difference between each of them?
0
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1answer
100 views
Confusions regarding meaning of "kernel" in signal processing and image processing? [duplicate]
While studying filters in DSP and DIP, the term "kernel" is often encountered
What is the meaning of "kernel" in context of filters??Please kindly explain in simple words with an example
I have also ...
7
votes
6answers
5k views
Meaning of Phase response of a filter? In simple words?
What is meant by phase response of a filter? Often it is associated with restoration of signal shape,so if a filter has linear phase response, its output looks like input otherwise output is ...
1
vote
2answers
131 views
Confusion understanding causality?
I already know the simple definition that causal system is the one that does not depend on future values of input but today i was confused as i came across a new definition of causality after reading "...
-1
votes
1answer
52 views
Confusing regarding triangular wave vs square wave?
I am reading signal processing first by Mcclellan. In chapter 3, I came across the term "discontinous" as shown underlined in attached photo.
Apparently "discontinuous" means having a gap/break but ...
2
votes
1answer
31 views
Describing a certain quality of an image
Generally I guess I’m asking for a source of image processing terminology.
Specifically here I’m trying to find the word for the quality that would identify the main difference between the Mondriaan ...
0
votes
1answer
33 views
Whats the technical term for a filter that allows a non unity stride when sliding it's window?
So a 1D mean filter of size two with a sliding window defined as W below could be considered as having a stride of one.
Wn=(Xn + Xn+1) / 2
Vn=W2n
where as if I were to define a 1D 'stepped mean ...
2
votes
0answers
629 views
Definitions of PSD, ESD and Autocorrelation
This question is going to encompass multiple areas and may not have a single answer but here it goes. I'm trying to conceptualize 3 different concepts and how they relate to each other. These 3 ...
0
votes
3answers
58 views
What word can I use to describe time-varying spectral content?
I have two devices that generate different classes of signals, one simple and one complex. I would like to find a single word or short phrase that describes the increased richness in one class ...
3
votes
1answer
258 views
Limiter, compressor, AGC, dynamics processor?
What are the primary differences between the usage or definitions of the terms “AGC”, “compressor”, “limiter”, and dynamics processor? They all seem to be forms of playing with gain knobs.
2
votes
2answers
458 views
Confused in difference between sequence versus signal?
I am learning basics of signals and systems with MATLAB
If i create a vector in matlab such that
x=[ 2 5 10 20], will it be considered a sequence or a signal?
As ...
1
vote
2answers
36 views
What is the technical term for the product of "number of pixels" and "number of channel per pixel"?
Assume I have m x n pixels of an RGB image. If I calculate 3mn, what is the name of quantity for this value?
0
votes
2answers
46 views
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 ...
5
votes
3answers
2k views
What is energy in image processing?
There are several web articles on the topic, but, after having read them, I still don't know what "energy" is, in the context of computer vision (CV) and image processing (IP). It is related to ...
1
vote
1answer
655 views
What is a periodic signal in image processing?
In the context of image processing (and computer vision), the concept of convolution comes up a lot. Convolution is quite related to the concept of Fourier transform and DFT. In the context of image ...
4
votes
1answer
2k views
What is the relation between time, frequency, spatial and spectral domains?
What is the relation between time, frequency, spatial and spectral domains?
I think that time and spatial domains are the "original" domains (e.g. if the signal is a greyscale image, then the domain ...
2
votes
3answers
1k views
What do we mean by spectrum?
Consider the context of image processing and computer vision, and, in particular, discrete Fourier transform.
For example, in the sentence
In the Discrete Time Fourier Transform the forward Fourier ...
3
votes
1answer
482 views
What is the difference between an impulse response and a kernel?
It seems to me they are two terms used to refer to the same concept, but, according to the Wikipedia page on Gaussian filter
a Gaussian filter is a filter whose impulse response is a Gaussian ...
1
vote
2answers
154 views
Is there any opposite name for Decibel?
According to definition of decibel it’s “logarithmic unit of measurement used to express”
So in audio we often convert linear value from range 0 to 1 to logarithmic scale for example like that:
<...
-3
votes
2answers
91 views
difficulty in understanding amplitude, frequency and period
I have difficulty in understanding of some fundamental terms as amplitude. Can be there more than one amplitude for a signal? The following expression is combination of 3 sinusoidal signal, so are ...
2
votes
1answer
429 views
Quadrature demodulation, homodyne detection, lock-in detection - what's the difference?
Quadrature demodulation
Homodyne detection
Lock-in detection
What is the difference between these terms? Are they all synonomous? In my mind they kind of are, so I'm never sure which to use.
I ...
1
vote
0answers
31 views
Does Mutual information utilize spatial information to calculate image similarity?
To calculate images similarity based on Mutual Information (MI), histogram and join histogram is required. In the literature, there are 2 contradict opinions about MI operation. 1. MI does not utilize ...
