| 摘要 |
<P>PROBLEM TO BE SOLVED: To create a unique identifier to identify each content uniquely without making any changes to the content. <P>SOLUTION: Decompressed music data is acquired by decoding a constant period of time (for example, one minute of the leading section) in a musical piece. Power spectrum is derived by implementing FFT (Fast Fourier Transform) to the data, then the data turns into second dimension data with both axes of a time base and a frequency base. Two dimensional matrix M is derived by sampling the data in a fixed unit both in time and frequency. Pairs of the M and a entire musical piece file are used as identifiers. <P>COPYRIGHT: (C)2004,JPO |
