PART-A

What is the different classification of binary codes?

Weighted codes

Non - weighted codes

Reflective codes

Sequential codes

Alphanumeric codes

Error Detecting and correcting codes.

What are the needs for binary codes?

Code is used to represent letters, numbers and punctuation marks.

Coding is required for maximum efficiency in single transmission.

Binary codes are the major components in the synthesis (artificial generation) of speech and video signals.

By using error detecting codes, errors generated in signal transmission can be detected.

Codes are used for data compression by which large amounts of data are transmitted in very short duration of time.

What are weighed codes? Give examples (NOV/DEC 2012)

The weighed codes are the codes that have assigned weights or values for each bit position. A code in which each bit position has a certain numeric value assigned. Several such codes exist, such as 8-4-2-1, 7-4-2-1, 6-3-1 -1, Excess – 3 code.

What are cyclic codes? (APR/MAY 2013)

An (n, k) linear code C is called a cyclic code if any cyclic shift of a codeword is another codeword. That is,