Patent ID: 8050334
Filing Date: 2011-11-01
Classification: G10L

Abstract:
1. A coding apparatus comprising: an amplitude adjustment amount determining section which determines an amplitude adjustment amount for adjusting the amplitude of sample values of a digital signal on a frame-by-frame basis, each frame including a plurality of sample values; an amplitude adjusting section which adjusts the amplitude of the digital signal in accordance with the amplitude adjustment amount determined by the amplitude adjustment amount determining section and outputs an integer signal; an integer signal coder which encodes the integer signal by using linear predictive coding to generate an integer signal code; and a multiplexer which outputs coded data including at least the integer signal code and information representing the amplitude adjustment amount; wherein the integer signal coder comprises: an adjustment amount buffer which holds an amplitude adjustment amount of a previous frame; a sample buffer which holds at least as many last samples in the previous frame as a number equal to an order P used in linear predictive analysis; and an interframe correction section which corrects an amplitude of at least last P sample values in the previous frame held in the sample buffer on the basis of the amplitude adjustment amount of a current frame and the amplitude adjustment amount of the previous frame that are determined by the amplitude adjustment amount determining section.