Audio device
The present application discloses an audio device that has an inhibitory effect on sound waves emitted by a near-field sound source within a specified range and has an amplification effect on sound waves emitted from a far-field sound source outside the specified range. The audio device includes a first sound wave sensor to receive a sound wave and output a first signal based on the sound wave; a second sound wave sensor to receive the sound wave and output a second signal based on the sound wave; and a signal processing circuit coupled to the first sound wave sensor and the second sound wave sensor to generate an output signal based on the first signal and the second signal, wherein the audio device's near-field sensitivity to a sound wave is substantially lower than its far-field sensitivity to the sound wave.
1. An audio device for sound transmission, comprising:
a head mounted electronic device;
a first sound wave sensor, mounted on the electronic device, to receive a sound wave and output a first signal based on the sound wave;
a second sound wave sensor, mounted on the electronic device, to receive the sound wave and output a second signal based on the sound wave; and
a signal processing circuit coupled to the first sound wave sensor and the second sound wave sensor to generate an output signal based on the first signal and the second signal,
wherein a target near-field sensitivity of the audio device to a target near-field sound wave emitted by a target near-field sound source is substantially lower than a far-field sensitivity of the audio device to a far-field sound wave emitted by a far-field sound source, and
wherein a second target distance of the target near-field sound source from the first sound wave sensor is shorter than a first target distance of the far-field sound source from the first sound wave sensor.
2. The audio device according to claim 1 , wherein the target near-field sensitivity being substantially lower than the far-field sensitivity is that a ratio of the target near-field sensitivity to the far-field sensitivity is lower than a predetermined value.
3. The audio device according to claim 1 , wherein
the first sound wave sensor includes a first microphone;
the second sound wave sensor includes a second microphone; and
a distance from the first microphone to the second microphone is a predetermined distance.
4. The audio device according to claim 3 , wherein
the target near-field sound source is positioned such that an absolute value of a sound pressure amplitude gradient of the target near-field sound wave between the first microphone and the second microphone is greater than a first sound pressure threshold; and
the target far-field should source is positioned such that an absolute value of a sound pressure amplitude gradient between a sound pressure amplitude of the target far-field sound wave between the first microphone and the second microphone is less than a second sound pressure threshold.
5. The audio device according to claim 1 , wherein:
when the electronic device is in operation, a position of the target near-field sound source has a fixed relationship with a spatial pose of the electronic device, the first sound wave sensor is at a first distance from a position of the target near-field sound source, and the second sound wave sensor is at a second distance from the position of the target near-field sound source.
6. The audio device according to claim 5 , wherein a sensitivity of the first sound wave sensor is a first sensitivity, a sensitivity of the second sound wave sensor is a second sensitivity, and
the first sensitivity and the second sensitivity are determined according to a ratio of the first distance to the second distance.
7. The audio device according to claim 5 , wherein a sensitivity of the first sound wave sensor is a first sensitivity, a sensitivity of the second sound wave sensor is a second sensitivity, and the first sensitivity is equal to the second sensitivity.
8. The audio device according to claim 5 , wherein the second sound wave sensor further includes an amplitude adjustment circuit configured to perform an amplitude adjustment on an initial second signal output by the second sound wave sensor according to a ratio of the first distance to the second distance to generate the second signal.
9. The audio device according to claim 8 , wherein the electronic device includes an adapting button configured to activate the amplitude adjustment circuit when pressed.
10. The audio device according to claim 8 , wherein when the audio device is in operation, a value of amplitude adjustment of the amplitude adjustment circuit changes in real time according to dynamic changes of the first distance and the second distance.
11. The audio device according to claim 5 , wherein the first sound wave sensor includes a phase adjustment circuit configured to perform a phase adjustment on an initial first signal output by the first sound wave sensor according to a difference between the first distance and the second distance to generate the first signal.
12. The audio device according to claim 1 , wherein the signal processing circuit includes a differential circuit.
13. The audio device according to claim 12 , further comprising a signal amplifying circuit to amplify an output signal of the differential circuit to generate an output signal of the audio device.
14. The audio device according to claim 5 , wherein a preset distance between the second sound wave sensor and the first sound wave sensor is adjustable.
15. The audio device according to claim 1 , wherein the head mounted electronic device includes a hearing aid, and
the hearing aid includes at least one earplug, at least part of the first sound wave sensor and at least part of the second sound wave sensor are disposed in the at least one earplug.
16. The audio device according to claim 15 , wherein each of the at least one earplug includes at least one signal converter, the at least one signal converter each is configured to receive the output signal from the signal processing circuit and output a sound signal transmitted through air.
17. The audio device according to claim 15 , wherein the at least one earplug each includes at least one signal converter, the at least one signal converter each is configured to receive the output signal from the signal processing circuit and output a bone-conducted sound signal.
18. The audio device according to claim 5 , wherein the electronic device includes a speaker, and the position of the target near-field sound source is a mounting position of the speaker.
19. The audio device according to claim 1 , wherein
the first signal includes n first sub-signals, the second signal includes n second sub-signals, wherein the i th first sub-signal and the i th second sub-signal correspond to the same frequency band, wherein n is a positive integer greater than 1, and i is any integer from 1 to n;
the signal processing circuit processes each pair of the first sub-signal and the second sub-signal having the same order number and then synthesizes the output signal.