Advanced Data Communications and Networks by Dr. William J. Buchanan (auth.)

By Dr. William J. Buchanan (auth.)

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0' 33 'p' 20 ----. 1 Huffman coding example The fmal coding will be: 11 10 00 011 0101 0100 'e' 'i' '0' 'p' 'b' 'c' The great advantage of Huffman coding is that, although each character is coded with a different number of bits, the receiver will automatically determine the character whatever their order. For example if a 1 is followed by a 1 then the received character is an 'e'. If it is followed by a 0 then it is an '0'. Here is an example: 11000110100100110100 will be decoded as: 'e' '0' 'p' 'c' 'i' 'p' 'c' When transmitting or storing Huffman-coded data, the coding table needs to be stored with the data (if the table is generated dynamically).

Typical files produced from LZ77ILZ78 compression methods are ZIP, ARJ, LZH, Z, and so on. Huffinan is used in ARC and PKARC utilities, and in the UNIX compact command. 1 Lempel-ZivnIufJman practical compression DriveSpace and DoubleSpace are programs used in PC systems to compress files on hard disk drives. They use a mixture of Huffinan and Lempel-Ziv coding, where H;ffinan codes are used to differentiate between data (literal values) and back references and LZ coding is used for back references.

_l_l_J_~--~-L-~-l-~-J--. _~_~_~_J -, -1-1- -rT -r -t -, -'-1- -. 1 Introduction Most sources of information contain redundant information or information that adds little to the stored data. An example of this might be the storage of a rectangular image. As a single color bitmapped image it could be stored as: 000000000000000000000000000000000000000000000 000000000000000000000000000000000000000000000 000000000000000000000000000000000000000000000 000000000011111111111111111111111111000000000 000000000010000000000000000000000001000000000 000000000010000000000000000000000001000000000 000000000010000000000000000000000001000000000 000000000010000000000000000000000001000000000 000000000010000000000000000000000001000000000 000000000011111111111111111111111111000000000 000000000000000000000000000000000000000000000 000000000000000000000000000000000000000000000 An improved method might be to store the image as a graphics metafile, such as: Rectangle 11, 4, 26, 7 rectangle at start co-ordinate (1 1,4) of width 26 and length 7 pixels or to compress long sequences of identical bit states, such as: 0,45 0,45 0,45 0,10 0,10 0,10 0,10 0,10 0,10 0,10 0,45 0,45 ; 45 bits of a ; 45 bits of a ; 45 bits of a 1,26 0,9 ; 10 bits 1,1 0,24 1,1 0,9 1,1 0,24 1,1 0,9 1,1 0,24 1,1 0,9 1,1 0,24 1,1 0,9 1,1 0,24 1,1 0,9 1,26 0,9 ' 0' '0' '0' of a '0', 26 1'5 and 9 0'5 Data compression is becoming an important subject as more and more digital 16 Advanced data communications information is required to be stored and transmitted.

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