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Signal Processing

Questions tagged [terminology]

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

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1answer
42 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/...
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1answer
549 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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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?
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3answers
71 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 ...
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2answers
77 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 (...
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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?
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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 ...
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1answer
28 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 ...
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2answers
34 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 ...
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1answer
17 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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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 ...
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2answers
46 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 ...
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1answer
122 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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1answer
734 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?
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3answers
672 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?
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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?
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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
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1answer
31 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 ...
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2answers
60 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 ...
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0answers
34 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
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3answers
261 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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1answer
86 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
235 views

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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1answer
173 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
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1answer
105 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
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1answer
52 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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1answer
569 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?
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1answer
85 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 ...
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6answers
4k 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 ...
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2answers
111 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 "...
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1answer
39 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
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1answer
27 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
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1answer
28 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
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0answers
570 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
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3answers
57 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
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1answer
227 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.
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2answers
416 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 ...
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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?
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2answers
44 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
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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
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1answer
561 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
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1answer
1k 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
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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
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1answer
390 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 Guassian filter a Gaussian filter is a filter whose impulse response is a Gaussian ...
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2answers
132 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: <...
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2answers
85 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
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1answer
394 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 ...
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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 ...
2
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1answer
179 views

Is Oversampling a Signal Same as Discretizing the Signal?

I am confused about the new terminology 'oversampling' I have encountered very recently. To explain it better, I am going to use numerical examples. Now let's assume I am using a BPSK modulator and my ...
1
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1answer
242 views

Intuition behind cepstrum analysis terminology

In multiple books I found a parallel between spectrum-analysis terminology and cepstrum-analysis terminology that says low pass filter $\rightarrow$ short pass lifter I didn't read explicitly what ...

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