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What is the sequence of operations in PCM?

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What is the sequence of operations in PCM?

(a) Sampling, quantizing, encoding

(b) Quantizing, encoding, sampling

(c) Quantizing, sampling, encoding

(d) None of the mentioned

This question was addressed to me in examination.

The query is from Quantization Techniques topic in chapter Speech Coding of Wireless/Mobile

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Correct choice is (a) Sampling, quantizing, encoding

Easiest explanation: Sequence of operation in PCM is sampling, quantization and encoding. Sampling and quantizing operations transform an analogue signal to a digital signal. The quantizing and encoding operations are usually performed in the same circuit at the transmitter, which is called an Analogue to Digital Converter (ADC). At the receiver end the decoding operation converts the pulse back into an analogue voltage in a Digital to Analogue Converter (DAC).

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