Advancement of 22.2 Multichannel Sound Broadcasting Based on MPEG-H 3D Audio

摘要

This study proposes improvements to 22.2 multichannel (22.2 ch) sound broadcasting service. 22.2 ch sound is currently used in the 8K satellite broadcasting in Japan. In this study, the audio system is migrated from channel-based audio to object-based audio. The object-based audio equips 22.2 ch sound with alternative and adaptive functionalities: the alternative functionality is related to dialogue controls such as multilingual services, while the adaptive functionality enables 22.2 ch sound to be adapted to the audio format of the playback equipment. Moving Picture Experts Group (MPEG)-H 3D Audio (3DA), which is the latest audio coding standard, is used as the audio coding scheme. A real-time encoder and decoder based on 3DA was developed to verify the practicability of the proposed system. The encoded audio data is packetized and transmitted by MPEG-H MPEG Media Transport (MMT) to be multiplexed with video data. A transmission experiment with 8K video was carried out in which the proposed system was proved to operate as designed in this study.