Discrete signal

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A discrete signal or discrete-time signal is a time series, perhaps a signal that has been sampled from a continuous-time signal. Unlike a continuous-time signal, a discrete-time signal is not a function of a continuous-time argument, but is a sequence of quantities; that is, a function over a domain of discrete integers. Each value in the sequence is called a sample.

When a discrete-time signal is a sequence corresponding to uniformly spaced times, it has an associated sampling rate; the sampling rate is not apparent in the data sequence, so may be associated as a separate data item.

[edit] Digital signals

A digital signal is a discrete-time signal that takes on only a discrete set of values. It typically derives from a discrete signal that has been quantized.

Common practical digital signals are represented as 8-bit (256 levels), 16-bit (65,536 levels), 32-bit (4.3 billion levels), and so on, though any number of quantization levels is possible, not just powers of two.

[edit] See also

• Aliasing, Anti-aliasing filter
• Analog-to-digital converter, Digital-to-analog converter
• Continuous signal
• Digital control
• Digital frequency
• Nyquist–Shannon sampling theorem
• Whittaker–Shannon interpolation formula
• Sample (signal)
• Sampling (signal processing)
• Signal (electrical engineering)

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