Sound reproduction method, sound reproduction device, and recording medium

A sound reproduction device comprising:

• a spatial information obtainer which obtains spatial information including information about each of a structure and a sound source disposed in a virtual space;
• an acoustic information obtainer which obtains acoustic information including an audio signal indicating sound by the sound source disposed in the virtual space, information about the virtual space, and second spatial information including position information of the sound source and the structure disposed in the space;
• an identifier which identifies a listening position of a listener in the virtual space;
• and a generator which determines, when the structure is disposed between the sound source and the listening position in the virtual space, at least one of (i) a sound pressure level of sound to be heard by the listener from each of one or more sound source directions, (ii) a total number of one or more sound sources, or (iii) a frequency characteristic of sound emitted from the one or more sound sources, based on a length of a propagation path bypassing the structure, the propagation path being a propagation path of the sound from the sound source to the listener, and in order to reproduce diffraction sound of the sound source, generates one or more virtual sound sources that are disposed in a neighborhood on one or more directions from the listening position toward one or more ends of the structure, and generates an audio stream for output using a head-related transfer function according to the one or more virtual sound sources generated and the listening position of the listener,
• wherein the total number of the one or more sound sources is determined to
• increase as the length of the propagation path increases.

A non-transitory computer-readable recording medium having recorded thereon a program for causing a computer to execute a sound reproduction method, the sound reproduction method comprising:

• obtaining spatial information including information about each of a structure and a sound source disposed in a virtual space;
• obtaining acoustic information including an audio signal indicating sound by the sound source disposed in the virtual space, information about the virtual space, and second spatial information including position information of the sound source and the structure disposed in the space;
• identifying a listening position of a listener in the virtual space;
• determining, when the structure is disposed between the sound source and the listening position in the virtual space, at least one of (i) a sound pressure level of sound to be heard by the listener from each of one or more sound source directions, (ii) a total number of one or more sound sources, or (iii) a frequency characteristic of sound emitted from the one or more sound sources, based on a length of a propagation path bypassing the structure, the propagation path being a propagation path of the sound from the sound source to the listener;
• in order to reproduce diffraction sound of the sound source, generating one or more virtual sound sources that are disposed in a neighborhood on one or more directions from the listening position toward one or more ends of the structure, and generating an audio stream for output using a head-related transfer function according to the one or more virtual sound sources generated and the listening position of the listener,
• wherein the total number of the one or more sound sources is determined to increase as the length of the propagation path increases.