Bitstream reconstruction method and apparatus for spatial audio rendering

A bitstream reconstruction method comprising:

• constructing an initial bitstream by rendering sound source information and geometry information within a reference radius from a location of a user accessing a virtual space into spatial audio;
• identifying an occurrence of an object creation/deletion event in the virtual space;
• calculating a distance from the location of the user to objects created or deleted according to the object creation/deletion event;
• and
• reconstructing the initial bitstream based on the calculated distance from the location of the user to the objects,
• wherein the reconstructing of the initial bitstream comprises:
• when the object creation/deletion event corresponds to an individual sound source object:
• determining whether an acoustic signal of an individual sound source object created or deleted according to the object creation/deletion event reaches within a transition area determined based on the reference radius;
• identifying, when it is determined that the acoustic signal of the created or deleted individual sound source object reaches within the determined transition area, a circular area of which a radius is a distance from the location of the user to an identification location of an individual sound source object located at the greatest distance from the location of the user among individual sound source objects of which an acoustic signal reaches within the determined transition area, the individual sound source objects comprising the created or deleted individual sound source object;
• and
• reconstructing the initial bitstream by rendering sound source information and geometry information included in the identified circular area into spatial audio;
• and
• when the object creation/deletion event corresponds to an individual geometry object:
• determining whether an individual geometry object created or deleted according to the object creation/deletion event exists within an acoustic reach distance of an individual sound source object included in a transition area determined based on the reference radius;
• identifying, when it is determined that the created or deleted individual geometry object exists within the acoustic reach distance of the individual sound source object included in the transition area, a circular area of which a radius is a distance from the location of the user to an identification location of an individual sound source object located at the greatest distance from the location of the user among individual sound source objects of which an acoustic signal reaches within the determined transition area;
• and
• reconstructing the initial bitstream by rendering sound source information corresponding to the identified circular area and geometry information comprising the created or deleted individual geometry object into spatial audio.

A bitstream reconstruction apparatus comprising:

• one or more processors;
• and
• a memory configured to load or store a program executed by the one or more processors,
• wherein the program comprises instructions that, when executed by the one or more processors, cause the one or more processors to perform:
• constructing an initial bitstream by rendering sound source information and geometry information within a reference radius from an initial location of a user accessing a virtual space into spatial audio;
• collecting location information according to a movement of the user within the virtual space;
• determining a transition area based on the reference radius when a movement radius identified according to the collected location information exceeds the reference radius;
• identifying a circular area of which a radius is a distance from the initial location of the user to an identification location of an individual sound source object located at the greatest distance from the initial location of the user among individual sound source objects of which an acoustic signal reaches within the determined transition area;
• and
• reconstructing the initial bitstream by rendering sound source information and geometry information included in the identified circular area into spatial audio.