Audio data processing device and audio data processing method

An audio data processing method comprising:

• a first reception step of receiving input of first audio data representative of a first sound by a first input unit;
• a second reception step of receiving input of second audio data representative of a second sound by a second input unit;
• a mixing step of mixing the first audio data and the second audio data by a mixing unit to generate mixed audio data;
• a first output step of outputting audio data being the first audio data and not having undergone the mixing, to a first speaker by a first output unit;
• a second output step of outputting the mixed audio data generated by the mixing step, to a second speaker by a second output unit;
• a processing step of performing processing of adding an acoustic effect to the audio data by a processor provided between a point of branching to the mixing unit and the first output unit on a transmission path between the first input unit and the first output unit, or between the mixing unit and the second output unit;
• and
• a delay step of delaying the audio data so that a relationship of timing between input, to the first speaker, of the audio data output from the first output unit and input, to the second speaker, of the audio data output from the second output unit coincides with a relationship of timing of input between the first audio data at the first input unit and the second audio data at the second input unit, by a delay unit provided between the branching point and the first output unit on the transmission path between the first input unit and the first output unit, or between the mixing unit and the second output unit,
• wherein a transmission speed of an audio data transmission path from the second output unit to the second speaker is lower than a transmission speed of an audio data transmission path from the first output unit to the first speaker, and
• the processor is provided between the branching point and the first output unit on the transmission path between the first input unit and the first output unit.