Audio stream combining apparatus, method and program

An audio stream combining method that generates one audio stream by joining two audio streams composed of compressed data that is generated by overlap transform;

• wherein the access units that serve as units of decoding of said two audio streams are designated as group 1 access units and group 2 access units, respectively;
• wherein the frames that are produced by decoding said two audio streams are designated as group 1 frames and group 2 frames, respectively;
• and wherein the access units that are produced by encoding the mixed frames that are generated by mixing said group 1 frames and said group 2 frames are designated as group 3 access units;
• wherein
• said audio stream combining method comprises:
• an input step that inputs group 1 access units and group 2 access units;
• a decoding step that generates group 1 frames by decoding the group 1 access units that are input in said input step and that generates group 2 frames by decoding said group 2 access units;
• and
• a combining step that selectively mixes said plurality of frames decoded in said decoding step and a plurality of group 2 frames, using the access units employed to decode the frames as a frame of reference, and that generates a prescribed number of group 3 access units;
• and that joins said plurality of group 1 access units and said plurality of group 2 access units, such that, using said prescribed number of group 3 access units as a joint, the information for the decoding of the same common frames is shared by access units that are adjacent to one another across the boundary between said plurality of group 1 access units, said plurality of group 2 access units, and said prescribed number of group 3 access units.

An audio stream combining program that causes the computer to execute the processing of generating one audio stream by joining two audio streams composed of compressed data that is generated by overlap transform;

• wherein the access units that serve as units of decoding of said two audio streams are designated as group 1 access units and group 2 access units, respectively;
• wherein the frames that are produced by decoding said two audio streams are designated as group 1 frames and group 2 frames, respectively;
• and wherein the access units that are produced by encoding the mixed frames that are generated by mixing said group 1 frames and group 2 frames are designated as group 3 access units;
• wherein
• said audio stream combining program comprises:
• an input step that inputs group 1 access units and group 2 access units;
• a decoding step that generates group 1 frames by decoding the group 1 access units that are input in said input step and that generates group 2 frames by decoding said group 2 access units;
• and
• a combining step that selectively mixes said plurality of frames decoded in said decoding step and a plurality of group 2 frames, using the access units employed to decode the frames as a frame of reference, and that generates a prescribed number of group 3 access units;
• and that joins said plurality of group 1 access units and said plurality of group 2 access units, such that, using said prescribed number of group 3 access units as a joint, the information for the decoding of the same common frames is shared by access units that are adjacent to one another across the boundary between said plurality of group 1 access units, said plurality of group 2 access units, and said prescribed number of group 3 access units.