| Project/Area Number |
24560482
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Communication/Network engineering
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| Research Institution | Shonan Institute of Technology |
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Principal Investigator |
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| Project Period (FY) |
2012-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2014: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2013: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2012: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Keywords | 無歪みデータ圧縮 / 情報理論 / 情報源符号化 / 情報スペクトル理論 / VF符号 / タンストール符号 / 冗長度 / 符号化レート / 十分統計量 / 個別冗長度 / ユニバーサル符号 / データ圧縮 / 一般情報源 / FF符号 |
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| Outline of Final Research Achievements |
Theoretical performance of variable-to-fixed length source codes is investigated. First, the performance of fixed-to-fixed length code, which is a subclass of variable-to-fixed length code, is investigated under two criteria, which are the asymptotic coding rate and the asymptotic redundancy. Under these two criteria, the optimal code class are defined and the conditions of inclusion relations of these two classes are formulated by the information-spectrum methods. Second, the asymptotic performance of a multi-shot Tunstall code is investigated for a stationary memoryless source. Geometrical mean of the leaf numbers of the Tunstall trees is newly defined. It is clarified that this quantity plays crucial roles at the evaluation of the asymptotic coding rate. Moreover, it is clarified that the situation is different between one-shot Tunstall code and multi-shot Tunstall code. The difference is characterized by the geometrical mean of the leaf numbers of Tunstall trees.
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