| 摘要 |
<P>PROBLEM TO BE SOLVED: To make possible precise extraction of a sound signal section, even if the input sound signal contains unsteady noise, without having to set a threshold for the power of input signals or process complex arithmetic operations. <P>SOLUTION: Analog sound signals of oscillation generated by any sound, when input, are converted into digital sound signals by sampling and quantizing (a step 101); a two-dimensional picture is prepared by graphic conversion of amplitude values in a time series on the basis of the digital sound signals acquired at the step 101 to prepare binary picture data (a step 102); the binary picture data prepared at the step 102 are subjected to contraction processing to convert the value of a noted pixel from 1 to 0 if a predetermined number of pixels around which have one or more of 0 value, to extract a sound signal section that constitutes an agglomerated region cleared of any noise section present in the binary picture data (a step 103); and the start point and the end point of the agglomerated region in the binary picture data are detected in a time series to identify the sound signal section extracted at the step 103 (a step 106). <P>COPYRIGHT: (C)2012,JPO&INPIT |
