21.3. Ambiguity in Morse Code

Try these first

1. 1.

   What is Morse Code?

   Hint

   Think about signal representation.

2. 2.

   Why is Morse code considered ambiguous?

   Hint

   Think of the sequence '01'.

3. 3.

   What does Morse code represent?

   • Numbers only
   • Characters only
   • Both numbers and characters

   Hint

   Consider what Morse initially encoded.

4. 4.

   True or False: The prefix code allows one code to be a prefix of another.

   • True
   • False

   Hint

   Think back to the definition of prefix codes.

5. 5.

   If the letters E, T, A, O, N are to be encoded with frequencies E=0.12, T=0.09, A=0.08, O=0.07, and N=0.06, derive optimal Huffman codes for them.

   Hint

   Construct the tree using the least frequent letters first.

6. 6.

   If Morse code were to include a new symbol 'S' represented by '--', how would this affect the current codes for E, T, and A if we start decoding from the beginning?

   Hint

   Think of how the new code interacts with existing symbols.