Audio processing device and audio processing method
[Problem] To propose a mechanism capable of performing a noise cancellation process in an ear hole opening type audio processing device. [Solution] An audio processing device including: an audio information acquisition unit that acquires audio information; a holding unit that abuts on a cavum concha or an inner wall of an ear canal and holds the audio information acquisition unit in a space closer to an eardrum side than a tragus, in a state of being worn by a user; an opening portion that opens an ear hole to an outside; and a signal processing unit that generates a noise cancellation signal based on the audio information acquired by the audio information acquisition unit.
1. 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.
2. The audio processing device according to claim 1 , wherein the holding unit holds the audio information acquisition unit in a space up to 15 mm away from a boundary between the cavum concha and the ear canal to the eardrum side or in a space up to 15 mm away from the boundary between the cavum concha and the ear canal on an opposite side of the eardrum.
3. The audio processing device according to claim 1 , further comprising
an audio output unit that outputs audio based on an output signal generated based on the noise cancellation signal,
wherein the holding unit maintains a relative positional relationship between the audio information acquisition unit and an output hole of the audio output from the audio output unit.
4. The audio processing device according to claim 1 , wherein the holding unit holds the audio information acquisition unit at a position where the inner wall of the ear canal is not present on a straight line between the audio information acquisition unit and the eardrum.
5. The audio processing device according to claim 1 , wherein the first audio information acquisition unit is further configured to:
acquire vibration information of one of the ear canal or the eardrum; and
acquire sound pressure information of a cancellation point based on the acquired vibration information.
6. The audio processing device according to claim 5 , wherein the cancellation point is one point of the eardrum.
7. The audio processing device according to claim 5 , wherein the audio information acquisition unit estimates the sound pressure information of the cancellation point based on the vibration information of two or more points on the inner wall of the ear canal.
8. The audio processing device according to claim 5 , wherein the audio information acquisition unit acquires a reflection wave which is the reflected transmission wave, and acquires the vibration information indicating displacement or a speed at the reflection point.
9. The audio processing device according to claim 8 , wherein the audio information acquisition unit estimates the sound pressure information of the cancellation point based on information indicating a three-dimensional shape of the ear canal.
10. The audio processing device according to claim 9 , wherein the audio information acquisition unit acquires the information indicating the three-dimensional shape of the ear canal by scanning the ear canal while changing a transmission direction of the transmission wave.
11. The audio processing device according to claim 10 , further comprising an authentication unit that authenticates the user based on the information indicating the three-dimensional shape of the ear canal.
12. The audio processing device according to claim 5 , further comprising
an audio output unit that outputs audio based on an output signal generated based on the noise cancellation signal,
wherein the signal processing unit adjusts a sound quality of the output signal based on information indicating a three-dimensional shape of the ear canal.
13. The audio processing device according to claim 1 , wherein the signal processing unit is further configured to:
extract a voice of the user based on the first audio information acquired by the first audio information acquisition unit corresponding to each ear of the user, and
synthesize the extracted voice with the noise cancellation signal.
14. The audio processing device according to claim 1 , further comprising a second audio information acquisition unit configured to collect second audio information that includes a voice of the user, wherein
the signal processing unit is further configured to extract the voice of the user based on the second audio information collected by the second audio information acquisition unit.