KR101979432B1 - Apparatus and method for predicting user viewpoint using lication information of sound source in 360 vr contents - Google Patents

Abstract

According to the present technology, disclosed are an apparatus and a method for predicting a viewpoint of a user by using location information of a sound source in 360-degree VR content. According to a specific embodiment of the present invention, the accuracy of predicting a viewpoint location can be better than the accuracy of predicting viewpoint location information of a user by using the existing image media presentation description (MPD) as the viewpoint location information of the user is predicted by using image MPD and audio MPD, a virtual reality service can be realistically provided as the user can feel the same sense of direction, the same sense of distance, and the same sense of space for virtual reality as a real environment by stereoscopically reflecting a real-environmental audio onto the virtual reality to provide the audio to the user. Therefore, the immersion and interest for the virtual reality service can be more improved.

Description

BACKGROUND OF THE INVENTION Field of the Invention [0001] The present invention relates to an apparatus and method for predicting a user's viewpoint using sound source location information in 360-degree VR content,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and method for predicting a user's viewpoint using sound source location information in 360 degree VR (Virtual Reality) contents, and more particularly, Which can improve the accuracy of user-viewpoint prediction and provide realistic virtual reality service by compressing and encoding the video and audio of the user's viewpoint by using the video and audio of the user viewpoint.

Recently, with the development of devices such as smart phones, social interest in VR technology (VR technology) is increasing. VR technology is one of the technologies that can overcome the limitations of the existing technology by increasing the fidelity of the representation of the simulated entity and overcoming the difference between the reality and the virtual system.

These 360 VR content is provided over the network to the DASH MPD. That is, the DASH is an adaptive bit-rate streaming technique that enables media data streaming from the web servers using the HTTP (Hyper-Text Transport Protocol) technique over the Internet.

In this case, the MPD assigns an adaptation set to the audio and video streams within a period, assigns a description set to each resolution in the adaptation set, divides the seconds segment into each applied adaptation set and description set, And is stored in the server 10.

On the other hand, a tile is divided into a single frame of video and then compressed and coded by a High Efficiency Video Codec (HEVC) for each tile.

 Accordingly, when the DASH client 20 pings the MPS (Media Presentation Description) provided from the HTTP engine and requests the content, the HTTP server provides a segment of the lowest resolution, And provides the segments adaptively according to < RTI ID = 0.0 > If a network situation is good, it requests a high quality segment, and if a network situation is bad, it requests a low quality segment.

However, the 360 VR content produced using this VR technology has a limitation in bandwidth consumption compared to the conventional 2D contents.

As shown in FIG. 1, a viewpoint including a region of interest (ROI) of a user is predicted using tiling of a high efficiency video codec, Various methods for reducing the bandwidth by transmitting the high quality image and transmitting the remaining tiles with low image quality have been developed. At this time, the user's viewpoint is predicted by using the moving object image. For example, when a car moves, a tile of a moving car is transmitted at a high image quality and a tile of the remaining background is transmitted at a low image quality.

However, there is no technology that reflects the sound source of the user's point in the virtual reality service so that the sense of direction, distance, and space of the sound source can be felt.

The present invention provides an apparatus and method for predicting a user's viewpoint using sound source location information in 360 degree VR content that can provide accuracy for user's viewpoint prediction by providing not only realistic images but also audio in a stereoscopic virtual reality service The purpose is to provide.

It is an object of the present invention to provide an apparatus and method for predicting a user's viewpoint using sound source location information in 360-degree VR contents, which can enhance the immersion and interest in a virtual reality service due to stereophonic sound provided by the present invention.

The objects of the present invention are not limited to the above-mentioned objects, and other objects and advantages of the present invention which are not mentioned can be understood by the following description, and will be more clearly understood by the embodiments of the present invention. It will also be readily apparent that the objects and advantages of the invention may be realized and attained by means of the instrumentalities and combinations particularly pointed out in the appended claims.

According to an aspect of the present invention, there is provided a viewpoint prediction apparatus for a user using sound source location information in 360-degree VR content,

If the type of media received through the network is DASH MPD (Dynamic Adaptive Streaming over Hypertext Transport Protocol), a MPD (Media Presentation Description) request command is generated together with a URL (uniform resource locator) included in the DASH MPD Forwarding DASH client; And an HTTP engine for collecting DASH segments received through the network based on the MPD request command, separating the DASH segments in seconds, and delivering the separated DASH segments and MPDs to the DASH client.

Preferably, the MPD includes audio MPD and video MPD, and audio MPD may include SRD and SLID.

Preferably, the Spatial Representation Description (SRD) includes a source_id (an identifier for the content source and a coordinate system of a temporarily defined decimal type positive integer), object_x (representing the horizontal position of the upper left corner associated with the media asset in the coordinate system) Object_y (a positive integer in decimal form representing the vertical position of the upper-left corner associated with the media asset in the coordinate system), object_width (a positive integer in decimal form indicating the width associated with the media asset in the coordinate system) ), object_height (a positive integer in decimal form indicating the height associated with the media asset in the coordinate system), total_width (a positive integer in the form of conditional decimal representing the extension of all media assets in the coordinate system), total_height And a spatial_set_id (identification for the media asset group) SLID (sound localization information description) includes sound_R (right phase information of a sound source in 360 VR content), sound_L (left phase information of a sound source in 360 VR content) ), sound_spatial_hori (horizontal angle information for visualizing a source of sound in 360 VR content and providing it to the user), and sound_spatial_verti (vertical angle information for visualizing the source of sound in 360 VR content to provide to the user).

Preferably, the DASH client may be configured to predict a user viewpoint location based on the received SRD and SLID and to request a predicted user viewpoint location tile from the HTTP engine, and the HTTP engine may request the predicted user viewpoint location tile And to forward the user view tile to the DASH client.

According to another embodiment of the present invention, a user's viewpoint prediction method using sound source position information in 360-degree VR content is performed by transmitting a MPD request command to a HTTP engine together with a uniform resource locator (URL) received through a network from a DASH client step; Receiving media data including audio and video MPD and DASH segments received in response to an MPD request command from the HTTP engine, separating DASH segments in units of seconds and forwarding them to the DASH client; Requesting a predicted user viewpoint location tile from the HTTP engine after predicting a viewpoint location based on the image MPD and audio MPD received from the DASH client; And displaying the received DASH segment on a screen based on a user viewpoint location tile received from the HTTP engine, wherein the audio MPD includes an SRD and an SLID, and the SRD includes a source_id Object_x (a positive integer in decimal form representing the horizontal position of the upper left corner associated with the media asset in the coordinate system), object_y (the media asset in the coordinate system and Object_width (a positive integer in decimal form indicating the width associated with the media asset in the coordinate system), object_height (a decimal representation of the height associated with the media asset in the coordinate system Total_width (a positive integer in the form of a conditional decimal number indicating the extent of the expansion of all media assets in the coordinate system) ), total_height (a positive integer in the form of a conditional decimal number indicating the extension height of all media assets in the coordinate system), and spatial_set_id (a positive integer in the form of a conditional decimal number providing an identifier for the media asset group) SLID includes sound_R (right phase information of a sound source in a 360 VR content), sound_L (left phase information of a sound source in a 360 VR content), sound_spatial_hori (horizontal angle information to visualize a sound source in a 360 VR content to provide to the user) And sound_spatial_verti (vertical angle information for visualizing the source of sound in 360 VR content to provide to the user).

 According to the present invention, as the user's viewpoint position information is predicted using the video MPD and the audio MPD, it is possible to further improve the accuracy of the viewpoint position prediction than to predict the viewpoint position information of the user using the existing video MPD Effect is obtained.

According to the present invention, since the audio of the real environment is three-dimensionally reflected to the virtual reality, it is provided to the user, so that the sense of direction, the sense of distance and the sense of space with respect to the virtual reality can be felt to be the same as the actual environment, Accordingly, the present invention has an advantage that immersion and interest in the virtual reality service can be further improved.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate preferred embodiments of the invention and, together with the description of the invention given below, serve to further understand the technical idea of the invention. And should not be construed as limiting.
FIG. 1 is an exemplary view showing a resolution of a user viewpoint area and a remaining area based on a tile of a conventional 360 VR content.
2 is a diagram showing a configuration of a communication system to which an embodiment of the present invention is applied.
3 is a diagram illustrating a configuration of a user's viewpoint prediction apparatus using sound source location information in 360-degree VR content according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Brief Description of the Drawings The advantages and features of the present invention, and how to accomplish them, will become apparent with reference to the embodiments described hereinafter with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.

The terms used in this specification will be briefly described and the present invention will be described in detail.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments. Also, in certain cases, there may be a term selected arbitrarily by the applicant, in which case the meaning thereof will be described in detail in the description of the corresponding invention. Therefore, the term used in the present invention should be defined based on the meaning of the term, not on the name of a simple term, but on the entire contents of the present invention.

When an element is referred to as " including " an element throughout the specification, it is to be understood that the element may include other elements as well, without departing from the spirit or scope of the present invention. Also, as used herein, the term " part " refers to a hardware component such as software, FPGA or ASIC, and " part " However, " part " is not meant to be limited to software or hardware. &Quot; Part " may be configured to reside on an addressable storage medium and may be configured to play back one or more processors.

Thus, by way of example, and not limitation, " part (s) " refers to components such as software components, object oriented software components, class components and task components, and processes, Subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays and variables. The functions provided in the components and " parts " may be combined into a smaller number of components and " parts " or further separated into additional components and " parts ".

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. In order to clearly explain the present invention in the drawings, parts not related to the description will be omitted.

2 and 3 discussed below, and should not be construed as limiting the scope of the present disclosure in any way. Those skilled in the art will appreciate that the principles of the present disclosure may be implemented in any appropriately configured wireless communication system.

2 illustrates a communication system to which an embodiment of the present invention is applied. Referring to FIG. 2, the system 100 includes a heterogeneous network 102 that facilitates communication among various components within the system 100 do. For example, the network 102 may transmit Internet Protocol (IP) packets, frame relay frames, asynchronous transfer mode (ATM) cells, or other information between network addresses. The network 102 may also be a heterogeneous network that includes broadcast networks, such as cable and satellite communication links. The network 102 may include one or more local area networks (LANs); Metropolitan area networks (MAN); Wide area networks (WAN); Global or some global network, such as the Internet; Or any other communication system or systems in one or more locations.

In various embodiments, the heterogeneous network 102 includes a broadcast network 102a and a broadband network 102b. Broadcast network 102a typically broadcasts a stream of media data to client devices 106-115, which is the direction of client devices 106-115 from one or more servers 104-105, . Broadcast network 102a may include any number of broadcast links and devices, such as, for example, satellite, wireless, wired, and fiber optic network links and devices.

Broadcast network 102a is typically configured to receive media data from client devices 106-115, which is a direction to travel from two directions, e.g., one or more servers 104-105 to client devices 106-115. It is for broadband access. Broadband network 102b may include, for example, any broadband links and devices, such as Internet, wireless, wired, and fiber optic network links and devices.

The network 102 facilitates communication between the servers 104-105 and the various client devices 106-115. Each of the servers 104-105 includes any suitable computing or processing device capable of providing computing services to one or more client devices. Each of the servers 104-105 may include, for example, one or more processing devices, one or more memories for storing instructions and data, and one or more network interfaces for facilitating communication over the network 102. For example, the servers 104-105 may include servers that broadcast media data over a broadcast network in the network 102 using HTTP techniques. In another example, the servers 104-105 may include servers that broadcast media data over a broadcast network in the network 102 using a dash (DASH).

Each of the client devices 106-115 represents any suitable computing or processing device that interacts with at least one server or other computing device (s) over the network 102. In this example, client devices 106-115 include a desktop computer 106, a mobile phone or smartphone 108, a personal digital assistant (PDA) 110, a laptop computer 112, a tablet computer 114, And a set-top box and / or a television 115. However, some other, or additional, client devices may be used within the communication system 100.

In this example, some client devices 108-114 communicate with the network 102 indirectly. For example, client devices 108-110 communicate via one or more base stations 116, such as cell phone base stations or eNodeBs. The client devices 112-115 also communicate via one or more wireless access points 118, such as IEEE 802.11 wireless access points. It should be appreciated that these are just examples and that each client device may communicate directly with the network 102 or indirectly with the network 102 via any suitable intermediate device (s) or network (s). As described in more detail below, either or both of the client devices 106-115 may include a structure for receiving and providing media data using HTTP and DASH.

The communication system 100 to which the embodiment of the present invention is applied may include any arbitrary arrangement for each component in any suitable configuration. In general, computing and communication systems appear in a wide variety of configurations, and Figure 2 does not limit the scope of this disclosure to any particular configuration. Figure 2 illustrates one operating environment in which the various features disclosed in this patent document may be used, although such characteristics may be used in any other suitable system.

3 illustrates a client device 200 for providing 360 VR content using HTTP and DASH in accordance with an embodiment of the present invention. Client device 200 includes client device 106 - 115 ). ≪ / RTI >

In the present invention, HTTP defines a new framework for time-continuous multimedia delivery such as audio, video, and other fixed content such as widgets, files, and the like. DASH is an adaptive bitstream streaming technique that enables streaming of media data received from HTTP servers via the Internet as a receiving entity.

Here, the client device 200 may include an HTTP engine 210, a DASH client 220, and a 360 VR engine 230, as shown in FIG.

The DASH client 220 delivers the received media data to the MPD parser 221 when the content type information received via the network 102b is a DASH MPD and the MPD parser 221 receives the received DASH MPD files . MPD parser 221 refers to the associated DASH MPD to identify the presentation time of the first access unit of the first segment in the DASH MPD file from the 'Media Sync' elements.

The MPD parser 221 then sends requests (e.g., " GET " requests) to the HTTP engine 210 along with a URL (uniform resource locator) received over the network 102 and the DASH segment Lt; / RTI >

On the other hand, the HTTP engine 210 receives the audio and video MPD and DASH segments received from the servers 104 and 105 according to the request of the DASH client 220, separates the received DASH segments into DASH segments in seconds To the DASH client (220). Wherein the MPD comprises an audio MPD and an image MPD for each audio and video stream of a frame within one cycle, each MPD comprising an adaptation set and a description set contained in the adaptation set, The description set further includes SRD (Spatial Related Description) data and SLID (Sound Location Information Description).

Here, SRD (Spatial Related Description) and SLID (Sound Location Information Description) are as shown in the following table.

[Table 1]

[Table 2]

As shown in Table 1, the SRD includes a source_id (providing an identifier for the content source and a coordinate system of a temporarily positive definite decimal type positive integer), object_x (representing the horizontal position of the upper left corner associated with the media asset in the coordinate system) Object_y (a positive integer in decimal form representing the vertical position of the upper-left corner associated with the media asset in the coordinate system), object_width (a positive integer in decimal form indicating the width associated with the media asset in the coordinate system) ), object_height (a positive integer in decimal form indicating the height associated with the media asset in the coordinate system), total_width (a positive integer in the form of conditional decimal representing the extension of all media assets in the coordinate system), total_height A positive integer in the form of a conditional decimal number indicating the extension height of the media asset group), and spatial_set_id (a conditional part providing an identifier for the media asset group Positive integer in decimal form).

Also, referring to Table 2, the SLID can be used to visualize a sound source in sound_R (right phase information of a sound source in 360 VR content), sound_L (left phase information of a sound source in 360 VR content), sound_spatial_hori , And sound_spatial_verti (vertical angle information for visualizing the source of the source in the 360 VR content to provide to the user).

The DASH client 220 receiving the audio MPD including the SRD and the SLID and the conventional video MPD predicts the location of the user's viewpoint based on the audio MPD and the video MPD, Request a tile (viewpoint tile).

The HTTP engine 210 delivers the predicted viewpoint tile to the DASH client 220. The DASH client 220 processes the DASH segments based on the viewpoint tile received from the HTTP engine 210 and transmits the processed DASH segments to the 360 VR engine 230 when the processing of the DASH segments is completed. .

The 360 VR engine 230 receives the DASH segments and decodes them using the appropriate decoders. The 360 VR engine 230 delivers the decoding results to the presentation engine 240 and the presentation engine 240 renders and provides the media data to be displayed to the user on the display. In a non-limiting example, the presentation engine 240 overlaps the private ad information time and location synchronized with the display of the associated media associated with and / or overlaps the time of the synchronized time with the associated portion of the displayed broadcast media data Picture-in-picture (PIP) data of the streamed broadband media content located in the Internet.

Accordingly, as the user's viewpoint position information is predicted using the video MPD and the audio MPD, the accuracy of the viewpoint position prediction can be improved more than the prediction of the viewpoint position information of the user using the existing video MPD, As the audio of the environment is three-dimensionally reflected in the virtual reality and provided to the user, the sense of direction, the sense of distance and the sense of space with respect to the virtual reality can be felt to be the same as the real environment. Thus, the virtual reality service can be realistically realized, The degree of immersion and interest can be further improved.

According to another aspect of the present invention, a method of predicting a user's viewpoint using sound source location information in 360-degree VR content includes the steps of delivering an MPD request command to an HTTP engine together with a uniform resource locator (URL) received through a network from a DASH client ; Receiving media data including audio and video MPD and DASH segments received in response to an MPD request command from the HTTP engine, separating DASH segments in units of seconds and forwarding them to the DASH client; Requesting a predicted user viewpoint location tile from the HTTP engine after predicting a viewpoint location based on the image MPD and audio MPD received from the DASH client; And displaying the received DASH segment on a screen based on a user viewpoint location tile received from the HTTP engine, wherein the audio MPD includes an SRD and an SLID, and the SRD includes a source_id Object_x (a positive integer in decimal form representing the horizontal position of the upper left corner associated with the media asset in the coordinate system), object_y (the media asset in the coordinate system and Object_width (a positive integer in decimal form indicating the width associated with the media asset in the coordinate system), object_height (a decimal representation of the height associated with the media asset in the coordinate system Total_width (a positive integer in the form of a conditional decimal number indicating the extent of the expansion of all media assets in the coordinate system) ), total_height (a positive integer in the form of a conditional decimal number indicating the extension height of all media assets in the coordinate system), and spatial_set_id (a positive integer in the form of a conditional decimal number providing an identifier for the media asset group) SLID includes sound_R (right phase information of a sound source in a 360 VR content), sound_L (left phase information of a sound source in a 360 VR content), sound_spatial_hori (horizontal angle information to visualize a sound source in a 360 VR content to provide to the user) And sound_spatial_verti (vertical angle information for visualizing the source of sound in 360 VR content to provide to the user). Each step of the user's viewpoint prediction method using the sound source location information in the 360 degree VR content is a function performed in the HTTP engine 210, the DASH client 220, and the 360 VR engine 230 described above. It is omitted.

According to the present invention, as the user's viewpoint position information is predicted using the video MPD and the audio MPD, the accuracy of the viewpoint position prediction can be improved more than the viewpoint position information of the user is predicted using the existing video MPD As the audio of the real environment is three-dimensionally reflected to the virtual reality, it is provided to the user, so that the sense of direction, distance, and space of the virtual reality can be felt to be the same as the real environment, realizing a realistic virtual reality service. The immersion and the interest in the virtual reality service can be further improved.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. For example, it is to be understood that the techniques described may be performed in a different order than the described methods, and / or that components of the described systems, structures, devices, circuits, Lt; / RTI > or equivalents, even if it is replaced or replaced. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined by the equivalents of the claims, as well as the claims.

As the user's viewpoint position information is predicted using the video MPD and the audio MPD, the accuracy of the viewpoint position prediction can be improved more than the viewpoint position information of the user using the existing video MPD, Since the audio is three-dimensionally reflected to the virtual reality and provided to the user, the sense of direction, the sense of distance, and the sense of space with respect to the virtual reality can be felt to be the same as the actual environment, realizing the realistic virtual reality service, It is possible to make a great progress in terms of accuracy and reliability of operation and further performance efficiency of a user's viewpoint prediction apparatus and method using sound source position information in 360 degree VR contents which can further improve the degree and the interest, There is a good chance that a system that provides a real service is commercially available or operating. It is an invention that is industrially applicable since it is practically possible to carry out clearly.

Claims (10)

If the type of media received through the network is DASH MPD (Dynamic Adaptive Streaming over Hypertext Transport Protocol), a MPD (Media Presentation Description) request command is generated together with a URL (uniform resource locator) included in the DASH MPD Forwarding DASH client; And
And an HTTP engine for collecting DASH segments received through the network based on the MPD request command, separating the DASH segments in seconds, and delivering the separated DASH segments and the MPD to the DASH client,
The MPD includes audio MPD and video MPD,
The audio MPD includes a Spatial Representation Description (SRD) and a Sound Localization Information Description (SLID)
The SLID
sound_R (right phase information of the sound source in the 360 VR content), sound_L (left phase information of the sound source in the 360 VR content), sound_spatial_hori (horizontal angle information to visualize the sound source in the 360 VR content to provide to the user) (360) of the 360-degree VR content (vertical angle information for visualizing the sound source in the 360-VR content and providing the information to the user). delete delete The method of claim 1, wherein the SRD (Spatial Representation Description)
source_id (a positive integer in the form of a decimal value providing an identifier for the content source and temporarily defining a coordinate system), object_x (a positive integer representing a horizontal position of the upper left corner associated with the media asset in the coordinate system), object_y (A positive integer in decimal form indicating the vertical position of the upper left corner associated with the media asset in the coordinate system), object_width (a positive integer in decimal form indicating the width associated with the media asset in the coordinate system), object_height , Total_width (a positive integer in the form of a conditional decimal value indicating the extent of the expansion of all media assets in the coordinate system), total_height (a conditional decimal representation of the extension height of all media assets in the coordinate system) Positive integer), and spatial_set_id (a positive integer in the form of a conditional decimal number that provides an identifier for the media asset group) Wherein the sound source position information includes at least one sound source position information in the 360-degree VR content. delete The method of claim 1, wherein the DASH client
Predicts the user's viewpoint position based on the received SRD and SLID, requests the predicted user viewpoint location tile to the HTTP engine,
Wherein the HTTP engine is adapted to deliver a user viewpoint tile to a DASH client according to a predicted user viewpoint positional tile request. Transmitting an MPD request command to a HTTP engine together with a uniform resource locator (URL) received from a DASH client through a network;
Receiving media data including audio and video MPD and DASH segments received in response to an MPD request command from the HTTP engine, separating DASH segments in units of seconds and forwarding them to the DASH client;
Requesting a predicted user viewpoint location tile from the HTTP engine after predicting a viewpoint location based on the image MPD and audio MPD received from the DASH client; And
Processing the received DASH segment based on the user viewpoint location tile provided from the HTTP engine and displaying the processed DASH segment on the screen,
Audio MPD and video MPD, and audio MPD
A Spatial Representation Description (SRD), and a Sound Localization Information Description (SLID)
sound_R (right phase information of the sound source in the 360 VR content), sound_L (left phase information of the sound source in the 360 VR content), sound_spatial_hori (horizontal angle information to visualize the sound source in the 360 VR content to provide to the user) (Vertical angle information for visualizing the sound source in the 360 VR content and providing the information to the user). delete 8. The method of claim 7, wherein the SRD
source_id (a positive integer in the form of a decimal value providing an identifier for the content source and temporarily defining a coordinate system), object_x (a positive integer representing a horizontal position of the upper left corner associated with the media asset in the coordinate system), object_y (A positive integer in decimal form indicating the vertical position of the upper left corner associated with the media asset in the coordinate system), object_width (a positive integer in decimal form indicating the width associated with the media asset in the coordinate system), object_height , Total_width (a positive integer in the form of a conditional decimal value indicating the extent of the expansion of all media assets in the coordinate system), total_height (a conditional decimal representation of the extension height of all media assets in the coordinate system) Positive integer), and spatial_set_id (a positive integer in the form of a conditional decimal number that provides an identifier for the media asset group) Figure 360 a user at the time prediction method using the sound source position information in the VR content comprises a one.


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