Audio signal processing method, recording medium, and audio signal processing device

An audio signal processing method executed by an audio signal processing device, the audio signal processing method comprising:

• obtaining an audio signal including attribute information identifying an attribute of the audio signal, the attribute including information indicating a reflected sound that is a sound resulting from a direct sound being reflected by a reflector;
• selecting whether to output an output signal that is based on the audio signal obtained, based on:
• a sound volume ratio between:
• a sound volume of the reflected sound at a time at which the reflected sound arrives at a listening position that is a position at which a listener is present;
• and a sound volume of the direct sound at a time at which the direct sound arrives at the listening position, the reflected sound being indicated by the audio signal obtained;
• a time difference between when the direct sound arrives and when the reflected sound arrives;
• and
• a reflection coefficient characteristic amount determined based on a reflection coefficient of the reflector;
• and
• outputting the output signal, when outputting the output signal is selected.

An audio signal processing method executed by an audio signal processing device, the audio signal processing method comprising:

• obtaining an audio signal;
• calculating a predetermined sound volume, the predetermined sound volume being based on a sound volume of a sound at a time at which the sound arrives at a listening position that is a position at which a listener is present, the sound being a sound indicated by the audio signal obtained, the calculating being based on:
• a predetermined correction characteristic obtained by correcting, using a frequency characteristic indicating auditory sensitivity, a gain characteristic of each predetermined frequency bandwidth related to the sound;
• and
• the audio signal obtained;
• selecting whether to output an output signal that is based on the audio signal obtained, based on the predetermined sound volume calculated;
• and
• outputting the output signal, when outputting the output signal is selected.

An audio signal processing method executed by an audio signal processing device, the audio signal processing method comprising:

• obtaining an audio signal including attribute information identifying an attribute of the audio signal;
• calculating a first sound volume, the first sound volume being based on a sound volume of an indirect sound at a time at which the indirect sound arrives at a listening position that is a position at which a listener is present, the calculating of the first sound volume being based on:
• a first correction characteristic obtained by correcting, using a frequency characteristic indicating auditory sensitivity, a gain characteristic of each predetermined frequency bandwidth of the audio signal for which the attribute includes information indicating the indirect sound, the attribute being identified by the attribute information included in the audio signal obtained;
• and
• gain information of the indirect sound;
• calculating a second sound volume, the second sound volume being based on a sound volume of a direct sound at a time at which the direct sound arrives at the listening position, the direct sound being associated with the indirect sound, the calculating of the second sound volume being based on:
• a second correction characteristic obtained by correcting, using a frequency characteristic indicating auditory sensitivity, a gain characteristic of each predetermined frequency bandwidth of the direct sound;
• and
• gain information of the direct sound;
• selecting whether to output an output signal that is based on the audio signal obtained, based on:
• a sound volume ratio between the second sound volume calculated and the first sound volume calculated;
• and a time difference between when the direct sound arrives and when the indirect sound arrives;
• and
• outputting the output signal, when outputting the output signal is selected.

An audio signal processing device comprising:

• an obtainer that obtains an audio signal including attribute information identifying an attribute of the audio signal, the attribute including information indicating an indirect sound;
• a first calculator that calculates a first sound volume, the first sound volume being based on a sound volume of the indirect sound at a time at which the indirect sound arrives at a listening position that is a position at which a listener is present, the first calculator calculating the first sound volume based on:
• a first correction characteristic obtained by correcting, using a frequency characteristic indicating auditory sensitivity, a gain characteristic of each predetermined frequency bandwidth related to the indirect sound;
• and
• the audio signal obtained;
• a second calculator that calculates a second sound volume, the second sound volume being based on a sound volume of a direct sound at a time at which the direct sound arrives at the listening position, the direct sound being associated with the indirect sound;
• a selection processor that selects whether to output an output signal that is based on the audio signal obtained, based on:
• a sound volume ratio between the second sound volume calculated and the first sound volume calculated;
• and a time difference between when the direct sound arrives and when the indirect sound arrives;
• and
• a reproducer that outputs the output signal, when outputting the output signal is selected.