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5.Coding§

ASCII codes are fixed length (7 + 1 bits)
- In general, $n$ bits can store $2^n$ codes
An alternative is variable-length coding
The relative frequencies for eight selected letters.

$\begin{split}\begin{array}{|c|cccccccc|} \hline \textrm Letter & C & D & E & K & L & M & U & Z\\ \textrm Frequency & 32 & 42 & 120 & 7 & 42 & 24 & 37 & 2\\ \hline \end{array}\end{split}$

Huffman Coding Trees

1 / 16 Settings

<<<>>>

av_c1

32
C

42
D

120
E

7
K

42
L

24
M

37
U

2
Z

Saving...

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Assigning Codes

1 / 16 Settings

<<<>>>

av_c6

32
C

42
D

120
E

7
K

42
L

24
M

37
U

2
Z

7
K

2
Z

7
K

24
M

32
C

2
Z

7
K

24
M

37
U

42
D

107

42
L

32
C

2
Z

7
K

24
M

186

37
U

42
D

107

42
L

32
C

2
Z

7
K

24
M

306

120
E

186

37
U

42
D

107

42
L

32
C

2
Z

7
K

24
M

Saving...

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Using Codes

1 / 11 Settings

<<<>>>

av_c6

32
C

42
D

120
E

7
K

42
L

24
M

37
U

2
Z

7
K

2
Z

7
K

24
M

32
C

2
Z

7
K

24
M

37
U

42
D

107

42
L

32
C

2
Z

7
K

24
M

186

37
U

42
D

107

42
L

32
C

2
Z

7
K

24
M

306

120
E

186

37
U

42
D

107

42
L

32
C

2
Z

7
K

24
M

Saving...

Server Error
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Decoding

1 / 17 Settings

<<<>>>

av_c8

E
120

L
42

C
32

M
24

U
37

D
42

Z
2

K
7

Saving...

Server Error
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