Signals and Systems: Time Scaling Operations Quiz
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Questions and Answers

If a > 1 the signal y(t) is a ______ version of x(t)

compressed

If 0 < a < 1 the signal y(t) is an ______ version of x(t)

expanded

Effect of time scaling on (a) DT signal x[n] and (b) version of x[n] ______ by a factor of 2

compressed

Some values of the original signal ______ as a result of the compression

<p>lost</p> Signup and view all the answers

Y(t) is the signal represents a ______ version of x(t) about t = 0

<p>reflected</p> Signup and view all the answers

Even signal; x(-t) = x(t) an even signal is same as ______ version

<p>reflected</p> Signup and view all the answers

Continuous-Time Signals are functions whose amplitude or value varies continuously with ______

<p>time</p> Signup and view all the answers

Discrete-Time Signals are functions that are defined or/and present only at discrete instants of ______

<p>time</p> Signup and view all the answers

Compression in signal processing involves reducing the size of the signal representation to save on ______ or transmission bandwidth

<p>storage</p> Signup and view all the answers

In signal processing, compression techniques aim to remove redundant or irrelevant information while preserving the essential ______

<p>data</p> Signup and view all the answers

Efficient compression algorithms can significantly reduce the amount of ______ needed to store or transmit a signal

<p>space</p> Signup and view all the answers

Compression is essential in various applications such as audio and video streaming to optimize storage and ______ efficiency

<p>bandwidth</p> Signup and view all the answers

The symbol n denotes time for ______ time signal

<p>discrete</p> Signup and view all the answers

Ts denotes ______ period

<p>sampling</p> Signup and view all the answers

A continuous-time signal x(t) is said to be an ______ signal if x(−t) = x(t) for all t symmetric about the vertical axis

<p>even</p> Signup and view all the answers

A continuous-time signal x(t) is said to be an ______ signal if x(−t) = − x(t) for all t antisymmetric about the vertical axis

<p>odd</p> Signup and view all the answers

A periodic signal x[n] is a function of time that satisfies the condition x[n] = x[n+N] for all N where N is a positive constant. x[n] is a ______ signal

<p>periodic</p> Signup and view all the answers

A deterministic signal is a signal that has no uncertainty with respect to its value at any time. The deterministic signal can be modeled as a completely specified function of ______

<p>time</p> Signup and view all the answers

Study Notes

Signal Transformations

  • If ( a > 1 ), the signal ( y(t) ) is a stretched version of ( x(t) ).
  • If ( 0 < a < 1 ), the signal ( y(t) ) is a compressed version of ( x(t)**.
  • Effect of time scaling on discrete-time (DT) signal ( x[n] ) results in a version of ( x[n] ) stretched or compressed according to the scaling factor.

Compression Effects

  • Original signal values may change as a result of time compression.
  • Signal ( Y(t) ) represents a reflected version of ( x(t) ) about ( t = 0 ).

Signal Types

  • An even signal satisfies the condition ( x(-t) = x(t) ); it appears the same when reflected across the vertical axis.
  • Continuous-time signals are functions whose amplitude or value varies continuously with time.
  • Discrete-time signals are defined only at discrete instants of time.

Compression in Signal Processing

  • Compression involves reducing the size of signal representation to save on storage or transmission bandwidth.
  • Compression techniques aim to remove redundant or irrelevant information while maintaining essential content.
  • Efficient compression algorithms can significantly reduce the amount of data needed for storage or transmission.
  • Compression is crucial in applications such as audio and video streaming to optimize storage and transmission efficiency.

Time Notation

  • The symbol ( n ) denotes time for discrete-time signals.
  • ( T_s ) denotes the sampling period.

Signal Symmetry

  • A continuous-time signal ( x(t) ) is even if ( x(-t) = x(t) ) for all ( t ), indicating symmetry about the vertical axis.
  • A continuous-time signal is odd if ( x(-t) = -x(t) ) for all ( t ), indicating antisymmetry about the vertical axis.

Periodic and Deterministic Signals

  • A periodic signal ( x[n] ) satisfies ( x[n] = x[n+N] ) for all ( N ), where ( N ) is a positive constant.
  • A deterministic signal is one with no uncertainty regarding its value at any time; it can be modeled as a completely specified function of time.

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Description

Test your knowledge on the basic operations of signals, focusing on time scaling, reflection, folding, and time shifting. Learn about the effects of time scaling on signals when multiplied by a real positive constant in continuous-time systems.

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