Method and an apparatus for processing an audio signal using preset matrix for controlling gain or panning
An apparatus for processing an audio signal and method thereof are disclosed. The present invention includes an audio signal receiving unit receiving the audio signal including at least one object; a preset metadata receiving unit receiving preset metadata from preset information; a preset rendering data receiving unit obtaining preset matrix from the preset information; a display unit displaying the preset metadata; an input unit receiving command for selecting one of the preset metadata; and an object adjusting unit adjusting output level of the object according to the output channel by using the preset matrix corresponding to the selected preset metadata. Accordingly, without user's setting for each object, if preset metadata to be applied to an audio signal is selected with reference to preset metadata and preset matrix, levels of objects included in the audio signal can be easily adjusted using preset rendering data corresponding to the selected preset metadata.
1. An apparatus for processing an audio signal, comprising:
an audio signal receiving unit receiving a downmix audio signal generated by downmixing at least one object;
an object information receiving unit receiving object information including object level information indicating a level of the at least one object, object gain information indicating a gain value of the at least one object and object correlation information indicating a correlation between objects;
a preset metadata receiving unit receiving preset metadata from preset information;
a preset rendering data receiving unit obtaining a preset matrix from the preset information,
wherein the preset matrix is usable to control a gain or panning of the at least one object;
a display unit displaying the preset metadata;
an input unit receiving a command for selecting one of the preset metadata,
wherein the preset rendering data receiving unit obtains the preset matrix corresponding to a selected preset metadata;
an object information processing unit generating downmix processing information and multi-channel information based on the object information and the obtained preset information;
a downmix audio signal processing unit processing the downmix audio signal based on the downmix processing information and the preset matrix corresponding to the selected preset metadata; and
a decoder decoding the processed downmix audio signal based on the multi-channel information and outputting an output channel.
2. The apparatus of claim 1 , wherein the display unit displays the selected preset metadata, when the output channel is output.
3. The apparatus of claim 1 , wherein the preset matrix is obtained based on output-channel information indicating that the output channel is one of mono, stereo and multi-channel.
4. The apparatus of claim 1 , wherein the preset information is obtained based on preset number information indicating a number of the preset information, and
wherein the preset matrix is obtained based on preset type information indicating that the preset information is represented in a matrix.
5. The apparatus of claim 1 , wherein the display unit displays the preset metadata in text.
6. The apparatus of claim 1 , further comprising:
a preset presence receiving unit receiving preset presence information indicating that the preset information exists,
wherein the preset information is obtained based on the preset presence information.
7. The apparatus of claim 1 , further comprising:
a preset matrix determining unit determining a dimension of the preset matrix based on a number of the at least one object and a number of output channels.
8. A method of processing an audio signal, the method comprising:
receiving a downmix audio signal generated by downmixing at least one object;
receiving an object information including object level information indicating a level of the at least one object, object gain information indicating a gain value of the at least one object and object correlation information indicating a correlation between objects;
receiving preset information including preset metadata and a preset matrix, wherein the preset matrix is usable to control a gain or panning of the at least one object;
displaying the preset metadata;
selecting one of the preset metadata;
obtaining a preset matrix corresponding to selected preset metadata from the preset information;
generating downmix processing information based on the object information and the obtained preset matrix;
generating multi-channel information based on the object information and the obtained preset matrix;
processing the downmix audio signal based on the downmix processing information and the preset matrix corresponding to the selected preset metadata; and
decoding the processed downmix audio signal based on the multi-channel information and outputting an output channel.
9. The method of claim 8 , further comprising:
displaying the selected preset metadata when the output channel is output.
10. The method of claim 8 , wherein the preset matrix is obtained based on output-channel information indicating that the output channel is one of mono, stereo and multi-channel.
11. The method of claim 8 , wherein the preset information is obtained based on preset number information indicating a number of the preset information, and
wherein the preset matrix is obtained based on preset type information indicating that the preset information is represented in a matrix.
12. The method of claim 8 , further comprising:
receiving preset presence information indicating that the preset information exists,
wherein the preset information is obtained based on the preset presence information.
13. The method of claim 8 , further comprising:
determining a dimension of the preset matrix based on a number of the at least one object and a number of output channels.