| 摘要 |
<P>PROBLEM TO BE SOLVED: To accurately specify a fundamental frequency even when a target component is interrupted. <P>SOLUTION: A frequency detection unit 62 specifies candidates frequencies Fc(1) to Fc(N) in every unit section Tu of a sound signal x. A first processing unit 71 searches for an estimated sequence RA which is a sequence obtained by arraying candidate frequencies Fc(n) selected in every unit section Tu, over a plurality of unit sections Tu and is highly likely to be a time series of a fundamental frequency Ftar of a target component. A second processing unit 72 searches for a state sequence RB obtained by arraying a sounded state Sv or a non-sounded state Su of the target component in every unit section Tu, over a plurality of unit sections Tu. An information generation unit 68 designates a candidate frequency Fc(n) in a unit section Tu corresponding to the sounded state Sv in the state sequence RB, in the estimated sequence RA as the fundamental frequency Ftar of the target component with respect to the unit section Tu and generates frequency information DF showing non-sounding per unit section Tu with respect to unit sections Tu corresponding to the non-sounded state Su in the state sequence RB. <P>COPYRIGHT: (C)2012,JPO&INPIT |
