Questions tagged [terminology]
For questions about words, phrases and definitions that are specific to signal processing.
137
questions
7
votes
14
answers
4k
views
What would be an example of something digital which isn't electronic?
The terms digital and electronic are often used interchangeably but I know that it's not correct because something can be digital but not electronic.
Something can be digital in the sense that it's ...
0
votes
1
answer
72
views
What is the symbol for angular frequency?
I am reading the book
Signals and Systems Laboratory with Matlab Book by Alex Palamides and Anastasia Veloni
I was going through chapter 6 (Fourier transform) and I came across a confusing thing ...
2
votes
0
answers
39
views
Global gain and frame gain in audio and speech processing
I'm wondering if there is a standard definition for global gain and frame gain in audio and speech processing. I found these terms together with an imprecise definition in a text about bandwidth ...
0
votes
2
answers
184
views
Is the unit step function periodic?
I am confused regarding the unit step signal. Is it considered to be periodic signal or non-periodic signal?
In MATLAB we use command heaviside to implement it ...
1
vote
2
answers
199
views
Relation between filter and convolution?
https://www.quora.com/How-is-signal-filtering-done-with-convolution
What is the relation between convolution and a filter?
Is it mainly that convolution process is used to determine the output of an ...
0
votes
1
answer
48
views
What is discrete in value/amplitude/magnitude?
A digital signal is commonly described as a signal which is discrete both in time and value/amplitude/magnitude.
I understand what is "discrete in time" (say, the signal is received each 1 ...
3
votes
1
answer
161
views
Why are wavelet transforms implemented in Python/Matlab often called Continuous wavelet transform when they take discrete-time input?
The implementations of Synchrosqueezing wavelet transform in Python (ssqueezepy) and MATLAB both write in their documentation that they implement the synchrosqueezing algorithm on the Continuous ...
5
votes
1
answer
220
views
Audio terminology for "rising frequency"?
Left is scalogram of exponential chirp, right is of a bunch of these within time shifts (Shepard Tone):
Is there audio terminology for describing this, besides "rising frequency"? Rising ...
0
votes
2
answers
70
views
When signal processing experts say something is analogue, what do they mean? [duplicate]
When signal processing experts say something is analogue, what do they mean?
If I understand correctly from prior research, they mean to an analogue system, i.e. a system with by-definition ...
1
vote
3
answers
570
views
What is the relation between the terms stable, asymptotically stable, marginally stable and unstable?
What is the difference between stable, asymptotically stable, marginally stable, and unstable systems?
I am familiar with the first term (stable) and last term (unstable) but I often get very confused ...
1
vote
2
answers
1k
views
S domain vs frequency domain?
Laplace domain is also known as "s domain".
Is there any difference between "s domain" and "frequency domain"? Can we use both terms interchangeably?
If we want to ...
0
votes
1
answer
91
views
What exactly happens in correlation?
I have understood convolution and it seems almost same as correlation mathematical expression wise. But in terms of signal processing,both are different operations.
The difference between convolution ...
1
vote
1
answer
67
views
The difference between convolution and cross-correlation from image processing point of view
The difference between convolution and cross-correlation from a signal-analysis point of view
The above question gives very good information from signal processing point of view. But what about images?...
0
votes
0
answers
27
views
Is there any rule of thumb for determining periodicity of a signal just by observation of mathematical expression?
Is there any way(rule of thumb) to determine periodicity of a signal just by observation of mathematical expression as rule of thumb mentioned in attachment for determining time invariance of a system
-1
votes
3
answers
254
views
Is it true that the “DFT can only deal with causal signals"?
I don't understand this remark and it's the first I hear it. Isn't this directly at odds with "DFT assumes input is periodic"? The full statement,
the signals are nonzero for $t < 0$, ...
0
votes
1
answer
89
views
Confusion regarding Laplace transform calculation in MATLAB
I am trying to learn about Laplace transform and especially about ROC and i found out on this weblink.
I have also attached a snapshot of this link and highlighted where it is being said that although ...
0
votes
1
answer
103
views
Confusion understanding parseval theorem?
I have tried to study about parseval theorem multiple times and what i am able to understand is that energy of time domain signal remains same when it is converted to frequency domain
Is my ...
0
votes
1
answer
49
views
Perpendicular to direction of oscillation, 2D sine wave
Is there a word to describe
"Contour" works for left but not right. "Phase contour"?
Context, above right is real part of a 2D separable Morlet (let's say, left windowed by ...
6
votes
3
answers
338
views
Cross-correlation seems defined backwards
Suppose $f$ and $g$ are real. Why
$$
C(\tau)=(f\star g)(\tau) = \int_{-\infty}^{\infty} f(t) g(t + \tau)dt \tag{1}
$$
and not
$$
C(\tau)=(f\star g)(\tau) = \int_{-\infty}^{\infty} f(t) g(t - \tau)dt\...
4
votes
7
answers
3k
views
Digital circuits are made of analog parts
I came across this here.
Assuming that this is a true statement and not an experts' small joke, what makes circuits with digits (say with 0,1 bit machine codes) "analog"?
-1
votes
2
answers
101
views
Is discrete or continuous a matter of frequency?
Is discrete or continuous a matter of frequency?
For example, would saying, this signal is in "discrete frequency" or "continuous frequency" make sense?
-1
votes
1
answer
45
views
Is any digital signal comprised of one or more discrete signals?
Is any digital signal comprised of one or more discrete signals?
i.e. one discrete signal or two or more discrete sub-signals?
5
votes
7
answers
2k
views
Is non-digital necessarily analog?
If, simply put, digital is defined as anything we can count (with digits, or say, up to ten digits per etymological analysis), I would assume that anything that we can't and it's analog, but if so, ...
1
vote
2
answers
168
views
Are there two widely accepted meanings for digital?
Are there two widely accepted meanings for digital?
Countable number of states (modes) such as on/off etc.
Suitable for "things which aren't defined as signals"
Discrete in both time and ...
0
votes
2
answers
59
views
What would be an example for something electric which isn't digital? [closed]
What would be an example for something electric which isn't digital?
By "electric" I mean to any consumer product manufactured and sold as an "electric product" anyone here could ...
2
votes
2
answers
523
views
Confusion regarding energy and power signals?
I know that when a signal has finite energy,it is energy signal and when its power is finite, it is power signal
But what is exactly meaning of finite here? Zero also included?
For example if a signal ...
1
vote
3
answers
221
views
Is digital necessarily discrete in both amplitude and time?
Is digital necessarily discrete in both amplitude and time?
Or rather it is necessarily discrete only in time (but not necessarily in amplitude)?
4
votes
1
answer
295
views
Difference between frame and image?
This term'Frame' is often used in image processing for frame rate, but is there any difference between an image and a frame?
5
votes
6
answers
1k
views
Number of dimensions? Color image vs gray scale image? Colour video vs gray scale video? Especially in the context of MATLAB
I am very confused as I had a debate with my buddy regarding color (RGB) images. He insisted that color images are two-dimensional, but when I personally try myself to read a color image into MATLAB, ...
3
votes
4
answers
1k
views
Meaning of arrow head in dirac delta?
Images of graphs of dirac delta show an arrow head pointing upwards at t=0, what does that means?
Is it referring that at t=0, amplitude is infinity?
0
votes
3
answers
288
views
Can a digital signal has 3 three values(1,0 and -1)?
Typically digital signals are seen having only two values,but is it possible that a digital signal has three values(1,0 and -1)?as shown highlighted in attached snapshot,which has been extracted from ...
1
vote
1
answer
127
views
Why is Line coding called "Line coding"?
Guys do you now why line coding also called digital base band modulation named "line coding" where does it come? and how is the name related to modulation
0
votes
0
answers
52
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
1
answer
38
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
vote
1
answer
223
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
1
answer
579
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
1
answer
46
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
3
answers
79
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
2
answers
93
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
2
answers
67
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
votes
1
answer
51
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
votes
1
answer
113
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
2
answers
48
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
1
answer
81
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 "...
1
vote
1
answer
45
views
Confusion regarding terminology?
While studying the topic of filter design, I came across following terms:
Factored form
SOS (second order sections)form
Rational form
Transfer function form
What is the difference between all these ...
3
votes
2
answers
269
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 ...
2
votes
1
answer
782
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
1
answer
6k
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
3
answers
816
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
votes
0
answers
39
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?