Methods and apparatuses for encoding and decoding object-based audio signals
An audio decoding method and apparatus and an audio encoding method and apparatus which can efficiently process object-based audio signals are provided. The audio decoding method includes receiving a downmix signal, which is obtained by downmixing a plurality of object signals, and object side information, extracting metadata from the object-side information and displaying an information regarding the object signals based on the metadata.
1. A method of decoding an audio signal by a decoding apparatus, comprising:
receiving a downmix signal and object-based side information, the downmix signal being obtained by downmixing one or more object signals;
receiving control information, the control information being usable to control a position or level of the one or more object signals;
extracting metadata indicating description of the one or more object signals from the object-based side information;
generating a processed downmix signal based on the downmix signal, the object-based side information and the control information;
generating channel-based side information based on the object-based side information and the control information; and
generating a multi-channel audio signal by using the processed downmix signal and the channel-based side information,
wherein the metadata uses a text format.
2. The audio decoding method of claim 1 , wherein the metadata comprises at least one of a number corresponding to the object signal and a description of the object signal.
3. The audio decoding method of claim 1 , wherein the metadata is included in a header of the object-based side information.
4. The audio decoding method of claim 1 , further comprising calculating the channel-based side information based on the control information, object level information and downmix gain information, the object level information being extracted from the object-based side information.
5. A method of encoding an audio signal by an encoding apparatus, comprising:
generating a downmix signal by downmixing one or more object signals; and
generating object-based side information corresponding to the one or more object signals,
wherein metadata is included in the object-based side information, the metadata indicating description of the one or more object signals, the metadata using a text format.
6. The audio encoding method of claim 5 , further comprising:
generating a bitstream by combining the downmix signal and the object-based side information into which the metadata is inserted.
7. An audio decoding apparatus comprising:
a demultiplexer configured to extract a downmix signal, object-based side information, and control information, the downmix signal being obtained by downmixing one or more object signals, the control information being usable to control a position or a level of the object signal;
a transcoder configured to extract metadata indicating description of the one or more object signals from the object-based side information, to generate a processed downmix signal based on the downmix signal, the object-based side information and the control information, and to generate channel-based side information based on the object-based side information and the control information; and
a multi-channel decoder configured to generate a multi-channel audio signal by using the processed downmix signal and the channel-based side information,
wherein the metadata uses a text format.
8. The audio decoding apparatus of claim 7 ,
wherein the multi-channel decoder generates the multi-channel audio signal by using the processed downmix signal and the channel-based side information.
9. A non-transitory computer-readable recording medium having recorded thereon a computer program for executing an audio decoding method, the audio decoding method comprising:
receiving a downmix signal and object-based side information, the downmix signal being obtained by downmixing one or more object signals;
receiving control information, the control information being usable to control a position of level of the one or more object signals;
extracting metadata indicating description of the one or more object signals from the object-based side information; generating a processed downmix signal based on the downmix signal, the object-based side information and the control information;
generating channel-based side information based on the object-based side information and the control information; and
generating a multi-channel audio signal by using the processed downmix signal and the channel-based side information,
wherein the metadata uses a text format.
10. A non-transitory computer-readable recording medium having recorded thereon a computer program for executing an audio encoding method, the audio encoding method comprising:
generating a downmix signal by downmixing one or more object signals; and
generating object-based side information by extracting object-related information from the object signal,
wherein metadata is included in the object-related information, the metadata indicating description of the one or more object signals, the metadata using a text format.