* Generally, quantization is the state of being constrained to a set of discrete values, rather than varying continuously.
In signal processing, quantization is the process of approximating a continuous signal by a set of discrete symbols or integer values.
In physics, quantization is either the taking of discrete rather than continuous values for some physical quantities; or the procedure to construct a quantum theory from its classical limit.
In music software, quantisation is the altering of the times and durations of notes so they fit the beat or subbeat perfectly.
In imaging software, quantization is the process of reducing the number of colors used to represent an image.
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