Patent ID: 8615316

Claim:
A method of processing an audio signal, the method comprising: receiving the audio signal, wherein the audio signal includes a plurality of objects; receiving object information including object level information indicating a level of the plurality of objects, object gain information indicating gains of each of the plurality of objects, and object correlation information indicating a correlation between objects; receiving preset presence information and preset number information, the preset presence information indicating preset information is available, and the preset number information indicating a number of the preset information; receiving the preset information based on the preset presence information and the preset number infatuation by an audio decoding apparatus, the preset information including preset metadata representing an attribute mode of the preset information, preset rendering data for rendering the plurality of objects and preset type information indicating whether the preset rendering data is in a matrix type or not, wherein the preset information exists in a header region or in each frame, wherein, when the preset information exists in the header region, the preset information is applied to all frames, and wherein, when the preset information exists in the each frame, the preset information is applied to a corresponding frame; obtaining a preset matrix from the preset rendering data by the audio decoding apparatus, wherein the preset matrix indicates a contribution degree of the plurality of objects to an output channel; adjusting an output level of the plurality of objects for the output channel based on the object information and the preset matrix by the audio decoding apparatus; and outputting an adjusted audio signal including the plurality of objects with an adjusted output level by the audio decoding apparatus, wherein the preset rendering data is generated for the plurality of objects.