Acoustic processing device, threshold value identifying device, and acoustic processing method

An acoustic processing device comprising:

• a circuit;
• and
• a memory,
• wherein using the memory, the circuit:
• obtains sound space information on a sound space;
• determines whether a sound source in the sound space is a point sound source, based on the sound space information;
• when the sound source is determined to be the point sound source,
• (i) obtains, based on the sound space information, a sound volume ratio between a sound volume of a direct sound and a sound volume of a reflected sound, the direct sound being generated from the sound source, the reflected sound being generated in the sound space in response to the direct sound,
• (ii) calculates, based on the sound space information, a time difference between an arrival time of the direct sound and an arrival time of the reflected sound, and
• (iii) controls whether to select the reflected sound, based on the sound volume ratio and the time difference;
• and
• when the sound source is determined not to be the point sound source, selects the reflected sound regardless of the sound volume ratio and the time difference.

A threshold value identifying device comprising:

• a circuit;
• and
• a memory,
• wherein using the memory, the circuit:
• obtains a time difference between an arrival time of a leading sound and an arrival time of a lagging sound generated in response to the leading sound;
• and
• identifies a threshold value of a sound volume ratio of a sound volume of the lagging sound to a sound volume of the leading sound, based on the time difference, and outputs the threshold value, the threshold value corresponding to a boundary as to whether the lagging sound is impacted by a precedence effect produced by the leading sound,
• in identifying the threshold value, on a boundary line in a region including a first axis of the time difference and a second axis of the sound volume ratio, the sound volume ratio corresponding to the time difference is identified as the threshold value, the boundary line being defined as a line indicating the boundary, and
• a domain of the boundary line on the first axis is a time range in which the precedence effect occurs.

An acoustic processing method comprising:

• obtaining sound space information on a sound space;
• obtaining, based on the sound space information, a sound volume ratio between a sound volume of a direct sound and a sound volume of a reflected sound, the direct sound being generated from a sound source in the sound space, the reflected sound being generated in the sound space in response to the direct sound;
• obtaining information on additional processing;
• and
• controlling whether to select the reflected sound, based on the information on the additional processing and the sound volume ratio.