NTA-NET (UGC-NET) Computer Science & Applications (87) Encoding Decoding Error Correction Detection-Variable Length Codes Study Material (Page 3 of 7)

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Prefix Codes: Self-Synchronizing Code, Optimal Prefix Code

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  • Based on the Prefix code, we can also have many different types of codes as follows,

Self-Synchronizing Code

  • It is a uniquely decodable code in which the symbol stream formed by a portion of one code word, or by the overlapped portion of any two adjacent code words, will not be a valid code word.
  • Putting it another way, a set of strings, called “code words” , over an alphabet is called a self-synchronizing code if for each string obtai…

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Huffman Codes: Problem Definition

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Huffman Codes

  • This is the most important section of this topic. We often see the Huffman code being asked mainly in the form of numerical sums. The calculations for this particular topic can be very tricky at times, thus it needs a lot of concentration.
  • In information theory, a Huffman code is a particular type of optimal prefix code that is commonly used for lossless data compression. The process of finding and/or using such a code proceeds by means of Huffman coding.
  • This “Huffman coding” is the actual algorithm which was developed by David A. Huffman in a 1952 paper. This method attracted a lot of research and has been adopted in many important and/or commercial applications, such as fax…

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