| 摘要 |
PROBLEM TO BE SOLVED: To obtain an encoding system discrimination device capable of discriminating an encoding system from only an encoded bit stream without using encoding system discrimination information. SOLUTION: An autocorrelation calculation means 2 obtains an autocorrelation value of a bit stream in a prescribed range of an encoded bit stream 100 being an object outputted from a windowing means 1. An encoding system discrimination means 4 discriminates an encoding system of the encoded bit stream 100 on the basis of similarities between the autocorrelation value calculated by the autocorrelation calculation means 2 and model patterns preliminarily stored in a storage means and outputs an encoding system discrimination result 200. COPYRIGHT: (C)2007,JPO&INPIT
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