Question

Which of the following statements is true with respect to PCM?

(a) The parallel binary data is converted into serial before transmission

(b) Analog data is transmitted directly

(c) Analog signal is amplified before transmission

(d) The analog signal is converted into parallel binary data before transmission

The question was posed to me in a job interview.

This interesting question is from Pulse Code Modulation in portion Radio Transmitters, Communication Receivers, Multiplexing and Demultiplexing of Avionics

Answer 1

The correct option is (a) The parallel binary data is converted into serial before transmission

The explanation: The analog signal is converted into a digital signal. Since the converted digital signal is parallel bits of data, it has to be converted to serial before it can be multiplexed and transmitted.