What does "quantization error" refer to in digital signal processing?

A) The error in the sampling rate

B) The difference between the actual analog value and its quantized value

C) The error introduced by noise

D) The error in the filtering process

Answer: B) The difference between the actual analog value and its quantized value

Explanation: Quantization error is the difference between the actual value of an analog signal and the value assigned to it during quantization. It arises due to the finite number of levels used in the quantization process.