3D Audio Metadata Embedding in AAC and MP3 Bitstreams
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional audio encoding technologies like AAC and MP3 are not capable of directly encoding and transmitting 3D Audio metadata, which is necessary for reproducing three-dimensional audio, leading to compatibility issues when trying to use these standards for 3D Audio.
Innovation Solution
The solution involves storing 3D Audio metadata in an ancillary data area of the encoded bit stream, using existing encoding techniques such as AAC and MP3, and employing methods like thinning processing and channel mapping to ensure compatibility, allowing for the transmission and reproduction of 3D Audio even if the decoding device does not support it.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional audio encoding standards (AAC, MP3) are used, then compatibility with existing systems is maintained, but the ability to encode and transmit 3D Audio metadata is lost
Solution Approach 1:
The patent introduces an ancillary data area as an intermediary component that carries 3D Audio metadata within the conventional audio bitstream. This mediator allows 3D metadata to coexist with standard audio data without disrupting existing encoding/decoding processes, thereby maintaining compatibility while enabling extended functionality.
Solution Approach 2:
The audio bitstream structure is enhanced to serve multiple functions: it simultaneously carries conventional audio data for standard playback and embedded 3D Audio metadata for spatial audio reproduction. This multi-functionality allows a single encoding system to support both traditional and advanced audio formats.
2Adaptability or versatility
If 3D Audio metadata is embedded in the ancillary data area, then 3D Audio transmission is enabled, but the data structure becomes more complex
Solution Approach 1:
The bitstream is segmented into distinct functional areas: the main audio data portion and the ancillary data area for 3D metadata. This segmentation allows independent processing of standard audio and 3D metadata, reducing the complexity burden on decoding devices while preserving full 3D audio functionality.
3Productivity
If thinning processing is applied to 3D Audio metadata, then data transmission efficiency is improved, but metadata precision is reduced
Solution Approach 1:
The patent applies partial action by selectively transmitting only essential 3D Audio metadata parameters through the ancillary data area, while optional or less critical metadata can be omitted or transmitted with lower precision. This approach achieves adequate 3D audio reproduction with improved transmission efficiency.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The present technology relates to an encoding device and method, a decoding device and method, and a program, which are adapted to be capable of improving convenience. The decoding device is provided with: a decoding unit that decodes audio data including an object audio, the audio data being included in an encoded bit stream, and reads metadata of the object audio from an area in which arbitrary data of the encoded bit stream can be stored; and an output unit that outputs the decoded audio data on the basis of the metadata. The present technology can be applied to the decoding device.