Everything about Discrete Signal totally explained
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 isn't 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 isn't apparent in the data sequence, so may be associated as a separate data item.
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.
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