Audio decoding device, audio decoding method, audio decoding program, audio encoding device, audio encoding method, and audio encoding program

An audio encoding device comprising:

• a plurality of encoding units which execute different audio encoding schemes, respectively, to generate coded sequences from audio signals;
• a selection unit which selects, the plurality of encoding units, an encoding unit to be used commonly to encode audio signals of multiple frames or selects, from the plurality of encoding units, a set of encoding units to be used commonly to encode audio signals of multiple super-frames each including a plurality of frames;
• a generation unit which generates a unit of long-term encoding scheme information for the multiple frames which indicates that a common audio encoding scheme is to be used to generate coded sequences of the multiple frames, or a unit of long-term encoding scheme information for the multiple super-frames which indicates that a set of common audio encoding schemes is to be used to generate coded sequences of the multiple super-frames;
• and
• an output unit which outputs a stream including the coded sequences of the multiple frames generated by the encoding unit selected by the selection unit, or the coded sequences of the multiple super-frames generated by the set of encoding units selected by the selection unit, and the long-term encoding scheme information.

An audio decoding method comprising;

• a step of extracting, from a stream having multiple frames each including a coded sequence of an audio signal and/or multiple super-frames each including a plurality of frames, a unit of long-term encoding scheme information for the multiple frames which indicates that a common audio encoding scheme is to be used to generate coded sequences of the multiple frames, or a unit of long-term encoding scheme information for the multiple super-frames which indicates a set of common audio encoding schemes is to be used to generate coded sequences of the multiple super-frames;
• a step of, in response to extraction of the long-term encoding scheme information, selecting, from a plurality of different audio decoding schemes, an audio decoding scheme to be used commonly to decode the coded sequences of the multiple frames, or selecting, from the plurality of audio decoding schemes, a set of audio decoding schemes to be used commonly to decode the coded sequences of the multiple super-frames;
• and
• a step of decoding the coded sequences of the multiple frames, using the selected audio decoding scheme, or decoding the coded sequences of the multiple super-frames, using the selected set of audio decoding schemes.

An audio encoding method comprising:

• selecting, from a plurality of different audio decoding schemes, an audio encoding scheme to be used commonly to encode audio signals of multiple frames, or selecting, from the plurality of audio encoding schemes, a set of audio encoding schemes to be used commonly to encode audio signals of multiple super-frames each including a plurality of frames;
• a step of encoding the audio signals of the multiple frames using the selected audio encoding scheme to generate coded sequences of the multiple frames, or encoding the audio signals of the multiple super-frames using the selected set of audio encoding schemes to generate coded sequences of the multiple super-frames;
• a step of generating a unit of long-term encoding scheme information for the multiple frames which indicates that a common audio encoding scheme is to be used to generate the coded sequences of the multiple frames, or a unit of long-term encoding scheme information for the multiple super-frames which indicates that a set of common audio encoding schemes is to be used to generate the coded sequences of the multiple super-frames;
• and
• a step of outputting a stream including the coded sequences of the multiple frames or the coded sequences of the multiple super-frames, and the long-term encoding scheme information.

A non-transitory storage medium that includes a program for causing a computer to function as:

• a plurality of decoding units which execute different audio decoding schemes, respectively, to generate audio signals from coded sequences;
• an extraction unit which extracts, from a stream having multiple frames each including a coded sequence of an audio signal and/or multiple super-frames each including a plurality of frames, a unit of long-term encoding scheme information for the multiple frames which indicates that a common audio encoding scheme is to be used to generate coded sequences of the multiple frames, or a unit of long-term encoding scheme information for the multiple super-frames which indicates that a set of common audio encoding schemes is to be used to generate coded sequences of the multiple super-frames;
• and
• a selection unit which, in response to extraction of the long-term encoding scheme information, selects, from the plurality of decoding units, a decoding unit to be used commonly to decode the coded sequences of the multiple frames or selects, from the plurality of decoding units, a set of decoding units to be used commonly used to decode the coded sequences of the multiple super-frames.

A non-transitory storage medium that includes a program for causing a computer to function as:

• a plurality of encoding units which execute different audio encoding schemes, respectively, to generate coded sequences from audio signals;
• a selection unit which selects, from the plurality of encoding units, an encoding unit to be used commonly to encode audio signals of multiple frames or selects, from the plurality of encoding units, a set of encoding units to be used commonly to encode audio signals of multiple super-frames each including a plurality of frames;
• a generation unit which generates a unit of long-term encoding scheme information for the multiple frames which indicates that a common audio encoding scheme is to be used to generate coded sequences of the multiple frames, or a unit of long-term encoding scheme information for the multiple super-frames which indicates that a set of common audio encoding schemes is to be used to generate coded sequences of the multiple super-frames;
• and
• an output unit which outputs a stream including the coded sequences of the multiple frames generated by the encoding unit selected by the selection unit, or the coded sequences of the multiple super-frames generated by the set of encoding units selected by the selection unit, and the long-term encoding scheme information.