Systems and methods for noise control

1. A system for reducing noise, comprising:

a first detector configured to detect a noise and determine a noise signal for representing the noise, wherein the first detector is an air conduction microphone, and the noise is transmitted to a user through an air conduction pathway;

a second detector configured to determine an error signal;

a processor configured to determine a noise correction signal based on the error signal and the noise signal; and

a bone conduction speaker configured to generate a sound based on the noise correction signal, wherein the sound is used to reduce the noise, the sound being transmitted to the user through a bone conduction pathway, wherein to determine the noise correction signal based on the error signal and the noise signal, the processor performs operations including:

determining a time difference between a first time of a first sound transmitted through the air conduction pathway and a second time of a second sound transmitted through the bone conduction pathway; and

determining the noise correction signal at least based on the time difference, the error signal, and the noise signal.

2. The system of claim 1 , wherein to determine the noise correction signal based on the error signal and the noise signal, the processor performs operations further including:

determining an amplitude adjustment coefficient corresponding to the air conduction pathway and the bone conduction pathway;

adjusting the amplitude adjustment coefficient and the time difference based on the error signal; and

determining the noise correction signal based on an adjusted amplitude adjustment coefficient, an adjusted time difference, and the noise signal.

3. The system of claim 2 , wherein determining the amplitude adjustment coefficient comprises:

determining a first transfer function of the air conduction pathway;

determining a second transfer function of the bone conduction pathway; and

determining the amplitude adjustment coefficient based on the first transfer function and the second transfer function.

4. The system of claim 1 , wherein the processor includes a modulator configured to perform amplitude modulation and/or phase modulation.

5. The system of claim 1 , wherein the second detector is an error microphone.

6. The system of claim 1 , wherein the error signal is corresponding to a superposition of a primary sound field and a secondary sound field, the primary sound field is corresponding to the noise, and the secondary sound field is corresponding to the sound.

7. A method for reducing noise, comprising:

determining a noise signal by detecting, by a detector, a noise, wherein the detector is an air conduction microphone and the noise is transmitted to a user through an air conduction pathway;

determining a noise correction signal, by a processor, based on an adaptive adjustment process and the noise signal; and

generating a sound, by a bone conduction speaker, based on the noise correction signal, wherein the sound is used to reduce the noise, the sound being transmitted to the user through a bone conduction pathway, wherein determining the noise correction signal based on the adaptive adjustment process and the noise signal comprises:

determining a time difference between a first time of a first sound transmitted through the air conduction pathway and a second time of a second sound transmitted through the bone conduction pathway; and

determining the noise correction signal at least based on the time difference, an error signal, and the noise signal.

8. The method of claim 7 , wherein determining the noise correction signal based on the adaptive adjustment process and the noise signal further comprises:

determining an amplitude adjustment coefficient corresponding to the air conduction pathway and the bone conduction pathway;

adjusting the amplitude adjustment coefficient and the time difference based on an error signal; and

determining the noise correction signal based on an adjusted amplitude adjustment coefficient, an adjusted time difference, and the noise signal.

9. The method of claim 8 , wherein determining the amplitude adjustment coefficient comprises:

determining a first transfer function of the air conduction pathway;

determining a second transfer function of the bone conduction pathway; and

determining the amplitude adjustment coefficient based on the first transfer function and the second transfer function.

10. The method of claim 9 , wherein the error signal is corresponding to a superposition of a primary sound field and a secondary sound field, the primary sound field is corresponding to the noise, and the secondary sound field is corresponding to the sound.

11. The method of claim 7 , wherein the processor includes a modulator configured to perform amplitude modulation and/or phase modulation.

12. A system for reducing noise, comprising:

a detector configured to generate a noise signal, wherein the noise signal indicates a second noise perceived by a user and the second noise includes a residual sound in an inner ear of the user;

a processor configured to determine a noise correction signal based on the noise signal; and

a speaker configured to generate a sound based on the noise correction signal, wherein the speaker is a bone conduction speaker, the sound is transmitted to the user through a bone conduction pathway, and to determine the noise correction signal based on the noise signal, the processor is configured to:

determine a time difference between a reference value and a transmission time of the sound through the bone conduction pathway; and

determine the noise correction signal at least based on the time difference and the noise signal.

13. The system of claim 12 , wherein the detector is a nerve monitoring device or a brain wave monitoring device.

14. The system of claim 12 , wherein the system further comprising one or more filters configured to decompose the noise signal into one or more sub-band noise signals.

15. The system of claim 12 , wherein the processor includes an A/D converter and a modulator, wherein the modulator is configured to perform amplitude modulation and/or phase modulation.

16. The system of claim 12 , wherein to determine the noise correction signal based on the noise signal, the processor is further configured to:

determine an amplitude adjustment coefficient;

determine a phase inverted signal of the noise signal; and

determine the noise correction signal based on the amplitude adjustment coefficient, the time difference, and the phase inverted signal of the noise signal.

17. The system of claim 16 , wherein to determine the amplitude adjustment coefficient, the processor is configured to:

determine a first transfer function of an air conduction pathway;

determine a second transfer function of the bone conduction pathway; and

determine the amplitude adjustment coefficient based on the first transfer function and the second transfer function.

18. The system of claim 12 , wherein the time difference is detected by a feedback detector.