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Discrete-time signal

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Title: Discrete-time signal  
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Subject: Digital signal processing, Signal (electrical engineering), Signal processing, Digital signal (signal processing), Digital signal
Collection: Digital Signal Processing, Signal Processing, Time, Time Series Analysis
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Discrete-time signal

Discrete sampled signal

A discrete signal or discrete-time signal is a time series consisting of a sequence of quantities. In other words, it is a time series that is a function over a domain of integers.

Unlike a continuous-time signal, a discrete-time signal is not a function of a continuous argument; however, it may have been obtained by sampling from a continuous-time signal, and then each value in the sequence is called a sample. When a discrete-time signal obtained by sampling a sequence corresponds to uniformly spaced times, it has an associated sampling rate; the sampling rate is not apparent in the data sequence, and so needs to be associated as a characteristic unit of the system.

Acquisition

Discrete-time signals may have several origins, but can usually be classified into one of two groups:[1]

  • By acquiring values of an analog signal at constant or variable rate. This process is called sampling.[2]
  • By observing an inherently discrete-time process, such as the weekly peak value of a particular economic indicator.

See also

References

  1. ^ "Digital Signal Processing" Prentice Hall - Pages 11-12
  2. ^ "Digital Signal Processing: Instant access." Butterworth-Heinemann - Page 8


  • Gershenfeld, Neil A. (1999). The Nature of mathematical Modeling. Cambridge University Press.  
  • Wagner, Thomas Charles Gordon (1959). Analytical transients. Wiley. 
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