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| Q. |
The method which has greater bandwidth efficiency is called as |
| A. | duobinary signalling |
| B. | polybinary signalling |
| C. | correlative coding |
| D. | all of the mentioned |
| Answer» B. polybinary signalling | |
| 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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