Patent ID: 6230124
Filing Date: 2001-05-08
Classification: G10L,H04L

Abstract:
A coding method comprising:an audio coding step for dividing on a time axis on an input audio signal into predetermined coding units and coding each of said predetermined coding units so as to output a plurality of types of audio coded parameters, wherein said audio coding step includes:a short period prediction residue calculation step for obtaining a short period prediction residue of said input audio signal,a sinusoidal wave analysis coding step for executing sinusoidal wave analysis coding on said short period prediction residue obtained in said calculation step, anda waveform coding step for coding said input audio signal by using waveform coding;a channel error detection code creation step for selecting important bits relative to human hearing from said plurality of types of audio coded parameters from said audio coding step and for creating a channel error check code from said selected important bits; anda convolution coding step for executing a convolution coding with said channel error check code and said selected important bits from said channel error check code creation step, wherein said channel error check code creation step selects as said important bits: at least some parameters created when said short period prediction residue is obtained in said short period prediction residue calculation step, at least some coded outputs of said sinusoidal wave analysis coding step, and at least some coded outputs from said waveform coding step, and creates said channel error check code from said important bits.