| 摘要 |
PURPOSE: A frequency analyzing method using an analyzing window is provided to supply more reliable and exact frequency information analyzing method to exact accurate melody extraction and music content information in a audio signal having various sound. CONSTITUTION: An inputted audio signal is resampled(S10). An audio signal inputted based on a time area is converted into a signal based on a frequency area(S20). A peak value of a amplitude in and a frequency value of a location expressing a peak value in spectrum of each obtained frame are extracted(S30). Based on the extracted values, a range that a melody pitch of each frame exists is reset(S40). Dynamic change information of the melody pitch is extracted with a method that grasps an autocorrelation coefficient between frames(S50). |
