| 摘要 |
<p>Character value of a sound signal is extracted for each unit portion, and degrees of similarity between the character values of the individual unit portions are calculated and arranged in a matrix configuration. The degree of similarity matrix has arranged in each column the degrees of similarity acquired by comparing, for each of the unit portions, the sound signal and a delayed sound signal obtained by delaying the sound signal by a time difference equal to an integral multiple of a time length of the unit portion, and it has a plurality of the columns in association with different time differences. Repetition probability, indicative of a level of similarity, is calculated for each of the columns corresponding to the different time differences in the degree of similarity matrix. A plurality of peaks in a distribution of the repetition probabilities are identified. Then, a reference matrix is generated which has predetermined reference values arranged in columns associated with positions of the time differences where the identified peaks are located. The loop region in the sound signal is identified by collating the reference matrix with the degree of similarity matrix.</p> |
