Chapter 1.10, Problem 4QE

a.

Explanation of Solution

Encode the sentence in ASCII using odd parity by adding a parity bit at the higher end for each character code: “Stop!” Cheryl shouted:

Use the table for ASCII codes to encode each character:

Symbol	ASCII Code
“	$00100010$
S	$01010011$
t	$01110100$
o	$01101111$
p	$\text{01110000}$
!	$\text{00100001}$
”	$00100010$
Space	$\text{00100000}$
C	$\text{01000011}$
h	$\text{01101000<}$

b.

Explanation of Solution

Encode the sentence in ASCII using odd parity by adding a parity bit at the higher end for each character code: Does $2+3=5\text{?}$

Use the table for ASCII codes to encode each character:

Symbol	ASCII Code
D	$\text{01000100}$
o	$\text{01101111}$
e	$\text{01100101}$
s	$\text{01110011}$