Patent ID: 7859438

Claim:
A digital signal coding apparatus for making a compression coding by dividing a digital signal into predetermined transmission units, comprising: an arithmetic coding unit for compressing the digital signal of said transmission unit by arithmetic coding, the arithmetic coding unit comprising: a context model determination unit for determining a context model to be used for each type of coding data among a plurality of context models: a binarization unit for generating a binarization rule defined based on the type of coding data; a probability of occurrence generation unit for providing a probability of occurrence of the context model corresponding to the binarization rule; a coding unit for arithmetic coding the digital signal of said transmission unit based on the generated probability of occurrence; a transmission unit generation unit for multiplexing information representing an initial state of the probability of occurrence of the context model to be used for each of said coding data, and information of initializing a register value which shows an arithmetic coding process into a bit stream as part of the coded data of said transmission unit.