Sig & Sys Mod 1 Lec 1

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Last updated 9:11 PM on 9/14/26
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15 Terms

1
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What is a signal?

Signal is a set of values or information that tell us something specific about the physical world

Ex: Sound, Biomedical Signals, Temperature

2
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What is a Continuous-Time Signal?

Continuous-Time has values for all points in time in some (possibly infinite) interval.

Signals from physical systems are mostly functions of continuous time.

<p>Continuous-Time has values for all points in time in some (possibly infinite) interval. <br><br>Signals from physical systems are mostly functions of continuous time.</p>
3
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What is a Discrete-Time Signal?

Discrete-Time Signal has values for only discrete points in time.

Signals from computational systems are often of discrete time.

(not really covered in signals 1)

<p>Discrete-Time Signal has values for only discrete points in time.<br><br>Signals from computational systems are often of discrete time.<br><br>(not really covered in signals 1)</p>
4
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What is a one dimensional signal?

One dimensional is a function of one variable

<p>One dimensional is a function of one variable</p>
5
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What is a Multi dimensional signal?

Multi dimensional is a function of multiple variables.

<p>Multi dimensional is a function of multiple variables.</p>
6
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What is an Analog Signal?

An analog signal is a signal whose amplitude can take any value in a continuous range

<p>An analog signal is a signal whose amplitude can take any value in a continuous range</p>
7
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What is a Digital Signal?

A digital signal is a signal whose amplitude can take only a finite number of values.

<p>A digital signal is a signal whose amplitude can take only a finite number of values.</p>
8
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What are some characteristics of Analog, Continuous-time signals:

  • Provide a more accurate
    representation of changes in the
    physical world.

  • Easier to process

  • Has much higher density, and can
    present more refined information


<ul><li><p><span style="color: rgb(255, 255, 255);">Provide a more accurate<br>representation of changes in the<br>physical world.</span></p></li><li><p><span style="color: rgb(255, 255, 255);">Easier to process</span></p></li><li><p><span style="color: rgb(255, 255, 255);">Has much higher density, and can<br>present more refined information</span></p></li></ul><p></p>
9
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What are some characteristics of Digital, Discrete-time signals:

  • Convey information with less noise,
    distortion and interference

  • Can be reproduced easily

  • Can be transmitted over long
    distances

  • Easily stored on any magnetic media
    or optical media


<ul><li><p>Convey information with less noise,<br>distortion and interference </p></li><li><p>Can be reproduced easily</p></li><li><p>Can be transmitted over long<br>distances</p></li><li><p>Easily stored on any magnetic media<br>or optical media</p></li></ul><p></p>
10
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What is a Periodic Signal?

A periodic signal is a signal that repeats it’s sequence of values exactly after a fixed length of time, known as the period.

<p>A periodic signal is a signal that repeats it’s sequence of values exactly after a fixed length of time, known as the period.</p>
11
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What is a Aperiodic Signal?

An aperiodic signal is a signal that does not repeat itself after a specific interval

<p>An aperiodic signal is a signal that does not repeat itself after a specific interval</p>
12
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What is a Deterministic Signal?

A deterministic signal is a signal whose physical description is known mathematical form or a graphical form

<p>A deterministic signal is a signal whose physical description is known mathematical form or a graphical form</p>
13
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What is a Random Signal?

A signal whose values cannot be predicted precisely but are known only in terms of probabilistic description. A random signal cannot be described by an explicit mathematical relation.

Ex: Mean Value or Mean-Squared value is a random signal.

<p>A signal whose values cannot be predicted precisely but are known only in terms of probabilistic description. A random signal cannot be described by an explicit mathematical relation.<br><br>Ex: Mean Value or Mean-Squared value is a random signal.</p>
14
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What is Time Domain Analysis in a signal analysis.

The time domain analysis is the analysis of physical signals in reference to time.
(how the signal changes over time)

<p>The time domain analysis is the analysis of physical signals in reference to time.<br>(how the signal changes over time)</p>
15
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What is Frequency Domain Analysis in a signal analysis.

The frequency domain analysis represents signal as a combination of basis functions (like sinusoids), & shows how the signal’s energy is distributed over a range of frequencies.

<p>The frequency domain analysis represents signal as a combination of basis functions (like sinusoids), &amp; shows how the signal’s energy is distributed over a range of frequencies.</p>