Coding Systems , Error Detection

Question 1

ASCII

Answer 1

based on 7 bits of data for each character
128 different characters possible

Question 2

Extended ASCII

Answer 2

Based on 8 bits of data
256 different characters
- allows additional characters
For english language the most significant bit will be 0

Question 3

Unicode

Answer 3

Industry standard code
Based on 16 bits data so 2^16 possible characters
ASCII and Extended ASCII incorporated into Unicode

Question 4

Checksum

Answer 4

String of digits added to end of data to check data is accurate - calculated from data itself within using algorithm

Question 5

Check Digit

Answer 5

Special case of checksum that is only 1 digit long - appropriate for small blocks of data

Question 6

Parity System

Answer 6

Parity bit is a single bit added to a transmission that can be used to check for errors in the transmitted data . ~~~ parity check

Question 7

Majority Voting

Answer 7

Sends same bit multiple times and goes with most common bit value