Systems and methods for noise reduction using sub-band noise reduction technique

1. A system for noise reduction, comprising:

a sub-band noise sensor configured to detect a noise and generate a plurality of sub-band noise signals in response to the detected noise, each of the sub-band noise signals having a distinctive sub-band of the frequency band of the noise;

a plurality of sub-band noise reduction modules, each of the sub-band noise reduction modules being configured to receive one of the sub-band noise signals from the sub-band noise sensor and generate a sub-band noise correction signal for reducing the received sub-band noise signal; and

an output module configured to receive the sub-band noise correction signals and output a noise correction signal for reducing the noise based on the sub-band noise correction signals, wherein the sub-band noise sensor comprises:

a plurality of acoustic-electric transducers, each of the plurality of acoustic-electric transducers having a unique frequency response and being configured to generate a sub-band noise electrical signal by processing the noise, wherein at least one acoustic-electric transducer of the plurality of acoustic-electric transducers comprises an acoustic channel component configured to filter the noise to generate a sub-band noise, and a sound sensitive component configured to convert the sub-band noise into a sub-band noise electrical signal; and

a plurality of sampling modules, each of the sampling modules being configured to receive one sub-band noise electrical signal of the sub-band noise electrical signals, and sample the received sub-band noise electrical signal to generate one sub-band noise signal of the sub-band noise signals.

2. The system of claim 1 , wherein at least one acoustic-electric transducer of the plurality of acoustic-electric transducers comprises:

a sound sensitive component configured to convert the noise to a sub-band noise electrical signal.

3. The system of claim 1 , wherein:

a first acoustic-electric transducer of the plurality of acoustic-electric transducers has a first frequency response and is configured to generate a sub-band noise electrical signal corresponding to a first sub-band noise signal of the sub-band noise signals,

a second acoustic-electric transducer of the plurality of acoustic-electric transducers has a second frequency response and is configured to generate a sub-band noise electrical signal corresponding to a second sub-band noise signal of the sub-band noise signals, the second sub-band noise signal being adjacent to the first sub-band noise signal among the sub-band noise signals in the frequency domain, and

the first frequency response and the second frequency response intersect at a frequency point which is near at least one of a half-power point of the first frequency response or a half-power point of the second frequency response.

4. The system of claim 1 , wherein the frequency bands of the sub-band noise signals generated by the sub-band noise sensor cover the frequency band of the noise.

5. The system of claim 1 , wherein at least one sub-band noise reduction module of the sub-band noise reduction modules comprises:

a phase modulator configured to receive the corresponding sub-band noise signal, and generate a phase-modulated signal by modulating the phase of the corresponding sub-band noise signal; and

an amplitude modulator configured to receive the phase-modulated signal from the phase modulator, and generate the sub-band noise correction signal for reducing the corresponding sub-band noise signal by modulating the amplitude of the phase-modulated signal.

6. The system of claim 5 , wherein the phase modulation of the corresponding sub-band noise signal includes an inversion of the phase of the corresponding sub-band noise signal.

7. The system of claim 6 , the phase modulation of the corresponding sub-band noise signal further includes a compensation of a phase displacement of the corresponding sub-band noise signal in its transmission from the sub-band noise sensor to the phase modulator.

8. The system of claim 1 , wherein at least one sub-band noise reduction module of the sub-band noise reduction modules comprises:

an amplitude modulator configured to receive the corresponding sub-band noise signal, and generate an amplitude modulated signal by modulating the amplitude of the corresponding sub-band noise signal; and

a phase modulator configured to receive the amplitude-modulated signal from the amplitude modulator, and generate the sub-band noise correction signal for reducing the corresponding sub-band noise signal by modulating the phase of the amplitude-modulated signal.

9. The system of claim 8 , wherein the phase modulation of the amplitude-modulated signal includes an inversion of the phase of the amplitude-modulated signal.

10. The system of claim 9 , wherein the phase modulation of the amplitude-modulated signal further includes a compensation of a phase displacement of the corresponding sub-band noise signal in its transmission from the sub-band noise sensor to the phase modulator.

11. The system of claim 1 , wherein:

the noise correction signal includes the sub-band noise correction signals;

the output module includes a plurality of output units, and

each of the output units is configured to receive one of the sub-band noise correction signals generated by the sub-band noise reduction modules and output the received sub-band noise correction signal.

12. The system of claim 1 , wherein the output module is configured to:

receive the sub-band noise correction signals from the sub-band noise reduction modules;

combine the sub-band noise correction signals to generate the noise correction signal; and

output the noise correction signal.

13. The system of claim 1 , wherein the noise includes an ambient noise, the system further comprises:

a residual noise sensor configured to detect a residual noise and generate a residual noise signal in response to the detected residual noise, a distance between the residual noise sensor and the output module being shorter than a distance between the sub-band noise sensor and the output module; and

a feedback module configured to adjust the sub-band noise reduction modules according to the residual noise.

14. The system of claim 1 , wherein the acoustic channel component includes a chamber structure.

15. The system of claim 1 , wherein the acoustic channel component includes a pipe structure.