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Summary: Homework 4 Due at classtime 12:30.
1. What is the difference between a self-correcting code and an error detecting code?
Self-correcting allows you to fix the errors. Error detecting only tells you there is an error.
2. Even parity has been used in the information below to make sure that there are an even number of
X's in each row and column. One of the cells has been changed. Which cell is in error and what is the
error? The cell in red needs to be changed to blank.
x x x x
x x x x x
x x x x
x x x x
3. Which best explains why even parity is better than odd parity?
a. Even parity works even if there are an even number of columns.
b. Odd parity sometimes fails to work as there is no consistent coding of the lower right hand corner
c. Even parity is more reliable for transmission errors
d. They are equally good.
4. The best definition of parity is
a. Copying another cell
b. Evenness
c. Self checking
d. Error proof
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