Patent ID: 7742523

Claim:
A decoding system comprising: a recording medium storing coded picture data and audio data generated by a coding apparatus which codes a picture to generate the coded picture data and codes an audio signal to generate the audio data; and a decoding apparatus which decodes the coded picture data and the audio data stored in said recording medium, wherein the coded picture data and the audio data stored in said recording medium are generated by the coding apparatus which includes: a memory including memory areas each of which is able to store decoded field data corresponding to a frame; a coding unit which codes the picture using motion compensation with reference to decoded field data stored in one of the memory areas to generate the coded picture data; a memory management unit which, in the case where first decoded field data which is reference picture data is written in a first memory area which is in a data storable state, stores second decoded field data which is reference picture data into the first memory area in which the first decoded field data is stored when the second decoded field data makes up a frame in combination with the first decoded field data, and prohibits storage of second decoded field data into the first memory area in which the first decoded field data is stored and allows storage of the second decoded field data into a second memory area when the second decoded field data which is the reference picture data does not make up a frame in combination with the first decoded field data; and a voice coding unit which codes the audio signal to generate the audio data, and wherein said decoding apparatus includes: a memory unit including memory areas each of which is able to store decoded field data corresponding to a frame; a decoding unit configured to decode, on a field-by-field basis, the coded picture data using motion compensation with reference to decoded field data stored in one or more of the memory areas of said memory unit; a memory management unit configured to: in the case where first decoded field data which is reference picture data is written in a first memory area which is in a data storable state, store second decoded field data which is reference picture data into the first memory area in which the first decoded field data is stored when the second decoded field data makes up a frame in combination with the first decoded field data, and prohibit storage of second decoded field data into the first memory area in which the first decoded field data is stored and allow storage of the second decoded field data into a second memory area when the second decoded field data which is the reference picture data does not make up a frame in combination with the first decoded field data; and a voice decoding unit configured to decode the audio data.