Signal decoder, signal decoding method, program, and recording medium

摘要

Disclosed are a decoding method and apparatus. The apparatus comprises an integer signal decoder (620) which is configured to decode an integer signal code included in coded data in each frame by using linear predictive decoding and outputs an integer signal; and an amplitude reverse adjusting section which is configured to make amplitude adjustment to the integer signal by using an amplitude adjustment amount contained in the coded data and to output an amplitude-reverse-adjusted signal. The integer signal decoder (620) comprises a sample buffer (6206) which holds at least as many last sample values in the previous frame as the number equal to an order P used in linear prediction. The integer signal decoder (620) further comprises an adjustment amount buffer (6205) which is configured to hold the amplitude adjustment amount of the previous frame; and an interframe correction section (6204) which is configured to correct an amplitude of at least last P sample values in the previous frame held in the sample buffer (6206) on the basis of an amplitude adjustment amount of the current frame.