Question

What is the need for a quantizer in Digital Communications?

(a) Break up a sampled signal to a finite dataset

(b) Sample a pure analog signal

(c) Sample a digital signal

(d) Encode an analog signal

I have been asked this question in an interview for job.

Origin of the question is Digital Input Output topic in division Arduino Programming of Arduino

Answer 1

Right option is (a) Break up a sampled signal to a finite dataset

The explanation: The ADC (Analog to Digital Convertor) Circuit converts the pure analog signal to a digitized signal with discrete voltage points. However, in order to be able to perform further complicated computations on the data, we need to convert the discrete signal into a set of finite data points. This is done by mapping the values to a set of positive real integers.