practice_final_sol_haim

# practice_final_sol_haim - Solutions to Practice Final 1...

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Solutions to Practice Final 1. Huffman code Give a Huffman encoding into an alphabet of size D = 4 of the following probability mass function: p = ( 8 36 , 7 36 , 6 36 , 5 36 , 4 36 , 3 36 , 2 36 , 1 36 ) Solution: Huffman code (1) 8 8 15 36 (2) 7 7 8 (3) 6 6 7 (00) 5 5 6 (01) 4 4 (02) 3 3 (030) 2 3 (031) 1 (dummy) 0 (dummy) 0 2. Ternary Huffman word lengths Which of the following sequences of word lengths cannot be the word lengths of a 3-ary Huffman code and which can ? (a) L = (1 , 1 , 2 , 2 , 3 , 3 , 3) (b) L = (1 , 1 , 2 , 2 , 3 , 3) (c) L = (1 , 1 , 2 , 2 , 3) (d) L = (1 , 2 , 2 , 2 , 2 , 2 , 2) (e) L = (1 , 2 , 2 , 2 , 2) Solution: Ternary Huffman word lengths The simplest way is to draw a ternary tree for each case. Once we have 1

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the tree, we can easily determine whether the set of codes derived from that tree can be Huffman codes (no redundancy) or not. Based on this approach, we can easily see that only codes in (a), (b), and (d) are valid ternary Huffman codes. Alternatively, since the Huffman code tree should be complete including the dummies at the deepest level of the tree, we can obtain a simple condition for Huffman codewords as
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