Decoding apparatus and coding apparatus, decoding method and coding method

Abstract

A decoding apparatus is provided. The decoding apparatus has a first decoding part for decoding a code word obtained by encoding an input signal using a Code-Excited Linear Prediction encoding method. A second decoding part decodes a code word obtained by encoding a signal with an encoding method other than the Code-Excited Linear Prediction encoding method. A rising-transition detection and notification part has a detection part that detects the existence of a rising-transition of amplitude of the input signal based on time variation of a gain of excitation vectors obtained by the first decoding part, and a notification part that notifies the second decoding part that the rising-transition of the amplitude exists.

Description

technical field [0001] The present invention relates to a decoding device, an encoding device, a decoding method and an encoding method, in particular to a signal encoding, a decoding device, an encoding, and a decoding method for performing efficient compression encoding or decoding on an input signal. Background technique [0002] At present, there are many devices and methods for highly efficient compression coding and decoding of speech and audio signals. These include so-called scalable coding, which is a method of coding with a hierarchy, so that only a part of the codeword sequence can be decoded depending on the necessary quality or network conditions. Scalable coding has a structure in which an error signal between an encoder input signal and a decoded signal of a lower layer encoder is further encoded in an upper layer encoder, that is, layer by layer. The lowest layer is called the core layer, and the layers above it are called enhancement layers. A typical scal...

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Problems solved by technology

[0009] However, according to the above-mentioned prior art method, in order to shorten the leading echo generation interval, it is only to shorten the length of the transform block.

Since the length of the transform block changes in this way, the decoding side must have auxiliary information indicating the length of the transform block in order to decode the coded sequence, so the system structure becomes complicated.

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