| 摘要 |
PROBLEM TO BE SOLVED: To provide a voiced-unvoiced judging device capable of correctly judging a voiced section irrespective of a lapse of time. SOLUTION: The voiced-unvoiced judging device 10 includes an autocorrelation calculation part 11 for calculating an autocorrelation value of an input signal; a delay calculation part 12 for calculating a maximum delay of the calculated autocorrelation value, a noise judging part 13 for judging whether or not the input signal is noise based on the calculated delay; a noise estimating part 14 for estimating the noise from an input signal; a voiced-unvoiced judging part 14 for judging whether the input signal is voiced or unvoiced, based on a judgment result by the noise judging part 13, the noise estimated by the noise estimating part 14; and the input signal; and a counter 16 for clocking duration of a voiced section based on a judgment result by the voiced-unvoiced judging part. When the duration of the voiced section becomes a certain period of time or longer, the noise estimating part 14 changes a noise estimating technique so that the input signal is judged easier as voiced. COPYRIGHT: (C)2005,JPO&NCIPI
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