GB/T 44115.3-2025Information technology - Virtual reality content representation - Part 3: Audio (English PDF)

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part

1.Structure and drafting rules for standardization documents" Drafting. This document is Part 3 of GB/T 44115 "Information Technology Virtual Reality Content Expression". GB/T 44115 has been published in Lower part.

3.Audio. This document was proposed and coordinated by the National Information Technology Standardization Technical Committee (SAC/TC28). This document was drafted by: Tsinghua University, Beijing Institute of Technology, China Electronics Technology Standardization Institute, Beijing Zitiao Network Technology Co., Ltd. Co., Ltd., Saiyinxinwei (Beijing) Electronic Technology Co., Ltd., Beijing Panorama Information Technology Co., Ltd., Zhongguancun Audiovisual Industry Technology Innovation Alliance, Tsinghua University Tianjin Institute of Electronic Information, Peking University, Migu Culture Technology Co., Ltd., Tencent Technology (Shenzhen) Co., Ltd., Beijing iQiyi Yi Technology Co., Ltd., Xiaomi Communication Technology Co., Ltd., Atmos (Beijing) Intelligent Technology Co., Ltd., Huawei Technologies Co., Ltd., China Telecom Media University. The main drafters of this document are. Dou Weibei, Wang Jing, Geng Yidan, Zhu Bocheng, Li Jingxin, Huang Chuanzeng, Liu Derong, Wu Jian, Wu Qiang, Xu Shumin, Pan Xinde, Qu Tianshu, Li Yuepeng, Shang Shidong, Wang Zhihang, Liu Changtao, Huang Weiqing, Liu Mengmei, Zhao Tianbo, Han Zerui, Wang Bin, Han Jian, Li Lin, Xu Song, Hu Su, Wang Zhe, Gao Yuan, Zhu Mengyao, Jin Cong, Zhang Weimin, Gao Wen, Huang Tiejun, Zhao Haiying, Cui Xiaoran.

With the continuous emergence of virtual reality (VR) technology, virtual reality has become an emerging media form that enhances immersion. Expression and rendering reconstruction technology plays an important role in the immersive and realistic experience of virtual reality. At present, virtual reality panoramic video technology has However, due to the lack of technical specifications for VR audio content expression and rendering reconstruction, it is difficult to realize various VR audio Intercommunication and sharing between video acquisition and production and terminal playback devices or systems. GB/T 44115 aims to establish video and audio specifications applicable to virtual reality and is intended to consist of three parts.

1.System. The purpose is to establish the transmission format and signaling format of efficiently coded virtual reality video and audio data.

2.Video. The purpose is to establish the coding representation and reconstruction methods of virtual reality panoramic video and free viewpoint video.

Please note that in addition to the above patents, some of the contents of this document may still involve patents. The issuing agency of this document does not assume the responsibility for identifying patents. responsibility. Information technology Virtual reality Content expression Part

1 Scope

GB/T 44115.3-2025 specifies how audio is represented in virtual reality content in the Chinese VR standards series. Sound is what makes a virtual environment believable, and it is harder to get right than the picture: a sound has a position in the scene that must stay fixed as the listener turns their head, and reproducing that over headphones means convolving it with a head-related transfer function, while reproducing it over loudspeakers means an entirely different rendering problem. This document specifies both. It sets the serial stream syntax rules and the system framework, the metadata definition that carries the audio objects, channels and scene description, the AAMSF encapsulation format, and then the headphone renderer and the loudspeaker renderer in full, with two informative annexes on the selection of an HRTF library and on a VR audio method based on linear interpolation of HRTFs. At 395 pages it is a complete codec and rendering specification rather than a framework document. For a VR platform, a headset maker, an audio middleware vendor or a content producer working to Chinese requirements, this is the governing text.

This document specifies the presentation of immersive audio content in virtual reality (VR) devices and related systems, including metadata structures and System architecture and interface specifications of the renderer. This document is applicable to audio acquisition, transmission, rendering and playback in the fields of panoramic audio recording and broadcasting, immersive audio communication, virtual reality audio interaction, etc. Release system.

2 Normative references

The contents of the following documents constitute essential clauses of this document through normative references in this document. For referenced documents without a date, only the latest version (including all amendments) applies to this document. This document.

GB/T 5271.1 Information technology vocabulary Part

3 Terms and definitions

The terms and definitions defined in GB/T 5271.1, GB/T 5271.4, GB/T 5271.9 and GB/T 33475.3 and the following terms and definitions apply to this document.

4 Organization of data

GB/T 5271.9 Information technology vocabulary Part

9 Data communications

GB/T 17191 (all parts) Information technology Digital storage media with a data transfer rate of