test 5 review

Question 1

what is redundancy ?

Answer 1

-repetition in a message
-undergone lossless compression

Question 2

disadvantage of redundancy

Answer 2

larger message (takes space)

Question 3

2 advantages of redundancy

Answer 3

-more chances to understand
-allows error correction

Question 4

how is the english language redundant ?

Answer 4

-can still be understood without vowels
-visually can still be understood if you cut off the top half of each letter

Question 5

lossy compression

Answer 5

cant go back to original

Question 6

lossless compression

Answer 6

can go back to original

Question 7

what two can be corrected

Answer 7

-triple repetition
-hamming code

Question 8

what does double repetition do?

Answer 8

detects single errors/ can’t correct

Question 9

what does triple repetition do?

Answer 9

detect single&double errors/ can only correct one error

Question 10

what does Hamming code do?

Answer 10

detects 1 or 2 errors/ can only correct 1 error

Question 11

what does parity check code do?

Answer 11

detect only 1 error / no correction

Question 12

ambiguous vs non ambiguous

Answer 12

ambiguous - if one is a prefix for another
non ambiguous - not a prefix