# Questions tagged [terminology]

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

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### 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
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### 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 $t < 0$, ...
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58 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 ...
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41 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 ...
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22 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 ...
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164 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\...
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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"?
38 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?
43 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
138 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 ...
57 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 ...
164 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 ...
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1 vote
98 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)?
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1 vote
36 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?
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### 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, ...
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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?
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### 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 ...
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1 vote
92 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
50 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}_{...
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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)?
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1 vote
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### 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/...
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572 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 ...
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### 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?
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### 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 ...
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84 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?
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### 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 ...
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### 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 ...
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### 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 ...
28 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 "...
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1 vote
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### 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 ...
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1 vote
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### 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 ...
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368 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 ...
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1 vote
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### 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?
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### 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?
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### 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?
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### "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:
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### 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 ...
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### 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 ...
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### 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 ...
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292 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 ...
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126 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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### Meaning of monotonic in context of filters?

What is meant by "monotonic" in context of filter As shown in attached snapshot
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### 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
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### 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)" ...
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56 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; ...
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### 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?
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### 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 ...
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