LINEAR-PREDICTIVE ANALYSIS DEVICE, METHOD, PROGRAM, AND RECORDING MEDIUM

摘要

An autocorrelation calculating unit (21) calculates autocorrelation Ro(i) from an input signal. A prediction coefficient calculation unit (23) carries out linear-predictive analysis using modified autocorrelation R'o(i), which is a multiple of a coefficient wo(i) and the autocorrelation Ro(i). Here, a case is included in which, for at least some of the ordinals i, the coefficient wo(i) for the ordinal i has a monotonically increasing relationship as a value having a negative correlation with the fundamental frequency of an input signal in the current or preceding frame increases.