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In polybinary signalling method the present bit of binary sequence is algebraically added with ______ number of previous bits.

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In polybinary signalling method the present bit of binary sequence is algebraically added with ______ number of previous bits.

(a) j

(b) 2j

(c) j+2

(d) j-2

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This intriguing question originated from Correlative Coding in portion Formatting and Baseband Modulation of Digital Communications

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Right answer is (d) j-2

To elaborate: In polybinary signalling method the present binary digit of the sequence is formed from the modulo-2 addition of the j-2 preceding digits of the sequence and the present digit.

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