FREQUENCY DOMAIN PARAMETER SEQUENCE GENERATION METHOD CODING METHOD DECODING METHOD FREQUENCY DOMAIN PARAMETER SEQUENCE GENERATION DEVICE CODING DEVICE DECODING DEVICE PROGRAM AND RECORDING MEDIUM

摘要

An LSP parameter corresponding to the quantized LSP parameter of the previous frame used in the encoding of the time domain is obtained from a coefficient equivalent to the linear prediction coefficient obtained by encoding in the frequency domain. The LSP linear transformation unit 300 sets p to an integer of 1 or more, and a [1], a [2], ... , a [p] is a linear prediction coefficient sequence obtained by linear prediction analysis of a sound signal in a predetermined time interval, and ω [1], ω [2], ... , [p] are the linear prediction coefficient arrays a [1], a [2], ... , a [p], and the frequency domain parameter sequences? [1],? [2], ... , and [omega] [p] are input to the post-conversion frequency domain parameter sequences ~ [1], ~ [2], ... (I = 1, 2, ..., p) of the frequency domain parameters ω i and ω i [p] with respect to one or a plurality of frequency domain parameters close to ω i and ω i Domain parameters [omega] [i] after conversion by a linear transformation based on the relationship of the frequency domain parameters [omega] [i].