Audio processing device and audio processing method

An audio processing device, comprising:

• a first audio information acquisition unit configured to:
• acquire first audio information;
• and
• transmit a transmission wave to one of an ear canal or an eardrum, wherein
• the first audio information includes a distance between the first audio information acquisition unit and a reflection point, and
• the reflection point is a point at which the transmission wave is reflected in one of the ear canal or the eardrum;
• a holding unit configured to:
• hold the first audio information acquisition unit in a space closer to the eardrum than a tragus;
• hold the first audio information acquisition unit in a wearable state;
• and
• abut one of a cavum concha or an inner wall of the ear canal;
• an opening portion configured to open an ear hole to an outside;
• a signal processing unit configured to generate a noise cancellation signal based on the first audio information;
• and
• an operation control unit configured to:
• determine whether the audio processing device is worn by a user based on the distance between the first audio information acquisition unit and the reflection point;
• and
• control an operation of the audio processing device based on the determination.