# Questions tagged [terminology]

For questions about words, phrases and definitions that are specific to signal processing.

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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 ...
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 ...
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 ...
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
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 ...
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 ...
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 ...
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 ...
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
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
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 ...
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
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?...
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
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 $t < 0$, ...
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 ...
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 ...
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 ...
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\...
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"?
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?
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?
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
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 ...
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 ...
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
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)?
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?
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, ...
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?
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
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
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}_{...
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
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/...
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 ...
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?
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 ...
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 (...
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?
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 ...
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 ...
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 ...
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
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 ...
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 ...
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
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?