Real time audio encoding/decoding system using MPEG-H 3D Audio toward advancement of terrestrial broadcasting technology
* Presenting author
A real time audio encoding/decoding system using MPEG-H 3D Audio (3DA) was developed. Research and development for advancement of terrestrial broadcasting technology has been carried out in Japan. The authors are engaged in improvement of audio scheme in broadcasting system, specifically on highly efficient audio coding, audio object handling by metadata, and rendering feature adaptive to preference of listeners and playback environment. Adopted coding technology is MPEG-H 3DA standardized in 2015. Coding efficiency of MPEG-H 3DA is twice as high as conventional AAC in 22.2 multichannel (22.2 ch) sound transmission. The developed system supports up to 24-channel beds with 4 objects and can render adaptively to typical playback environments, e.g., 22.2 ch, 7.1.4 ch, 5.1.2 ch, 5.1 surround and stereo. The encoder accepts and interprets audio objects handled with a serial representation of the Audio Definition Model and dialogue enhancement and dialogue replacement are realized using audio object. Transmission experiment with 8K video is also reported.