In digital signal processing,

**quantization**is the process of approximating a continuous signal by a set of discrete symbols or integer values. In general, a quantization operator can be represented as

*Q*(*x*) = round(*f*(*x*))

*x*is a real number,

*Q(x)*an integer, and

*f(x)*is an arbitrary real-valued function that controls the 'quantization law' of the particular coder.

For example, in digital telephony, two popular quantization schemes are the 'A-law' and 'µ-law', each mapping an analog signal to an integer value represented by an 8-bit binary number, but each with a different function *f*.

See also: