PERIODICITY INTEGRATED ENVELOPE SERIES GENERATION DEVICE, PERIODICITY INTEGRATED ENVELOPE SERIES GENERATION METHOD, PERIODICITY INTEGRATED ENVELOPE SERIES GENERATION PROGRAM, AND RECORDING MEDIUM

摘要

PROBLEM TO BE SOLVED: To provide an envelope series capable of enhancing an approximation accuracy near the peak due to a pitch frequency of an acoustic signal.SOLUTION: A periodicity integrated envelope series generation device according to the present invention takes in an acoustic digital signal of the time domain for each frame which is a predetermined time section as an input acoustic signal, and generates a periodicity integrated envelop series as an envelope series. The periodicity integrated envelope series generation device according to the present invention includes: at least a spectrum envelope series calculation part; and a periodicity integrated envelope generation part. The spectrum envelope series calculation part calculates the spectrum envelope series of the input acoustic signal based on linear prediction of the time domain of the input acoustic signal. The periodicity integrated envelope generation deforms an amplitude spectrum envelope series and is referred to as the periodicity integrated envelope series based on a periodicity component in a frequency domain of the input acoustic signal.SELECTED DRAWING: Figure 1