The method which has greater bandwidth efficiency is called as(a) Duobinary signalling(b) Polybinary signalling(c) Correlative coding(d) All of the mentionedI got this question at a job interview.Asked question is from Correlative Coding in section Formatting and Baseband Modulation of Digital Communications

The method which has greater bandwidth efficiency is called as(a) Duob

1.	The method which has greater bandwidth efficiency is called as(a) Duobinary signalling(b) Polybinary signalling(c) Correlative coding(d) All of the mentionedI got this question at a job interview.Asked question is from Correlative Coding in section Formatting and Baseband Modulation of Digital Communications
Answer» Correct CHOICE is (b) Polybinary signalling Best EXPLANATION: If more than THREE levels are introduced in duobinary signalling technique the bandwidth efficiency INCREASES This METHOD is called as polybinary signalling.

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