Noise reduction method, system and terminal device

1. A computer-implemented noise reduction method for a robot having a head and a servo for controlling the head to rotate, the head being provided with a microphone array having a plurality of microphones located in beam areas on the head each being set as one of a noise suppression area and a sound source enhancement area, the method comprising executing on a processor steps of:

positioning a far-field sound source to obtain a position angle of the far-field sound source with respect to the microphone array;

calculating a target rotation angle basing on the position angle and an initial rotation angle of the servo;

controlling the servo to rotate the target rotation angle to align the microphone array with the far-field sound source;

determining whether the sound source enhancement area is aligned with the far-field sound source basing on the position angle, the initial rotation angle, and the target rotation angle; and

changing the noise suppression area currently aligned with the far-field sound source to the sound source enhancement area by changing an audio signal suppression ratio thereof, in response to the sound source enhancement area being not aligned with the far-field sound source;

wherein calculating the target rotation angle basing on the position angle and the initial rotation angle of the servo further comprises:

obtaining the initial rotation angle of the servo;

determining whether the position angle and the initial rotation angle meet a first preset condition; and

controlling the sound source enhancement area to emit a beam to act on the far-field sound source, in response to the position angle and the initial rotation angle meeting the first preset condition; and

wherein the step of calculating the target rotation angle basing on the position angle and the initial rotation angle of the servo comprises:

calculating a determination angle basing on the position angle and the initial rotation angle; and

calculating the target rotation angle basing on the determination angle.

2. The method of claim 1 , wherein the step of calculating the determination angle basing on the position angle and the initial rotation angle comprises:

determining whether the position angle meets a second preset condition;

setting the determination angle as a sum of the position angle and the initial rotation angle, in response to the position angle meeting the second preset condition; and

setting the determination angle as subtracting a group angle of the position angle from the initial rotation angle, in response to the position angle not meeting the second preset condition, wherein the group angle of the position angle equals to 360 minus the position angle.

3. The method of claim 1 , wherein the step of determining whether the sound source enhancement area is aligned with the far-field sound source basing on the position angle, the initial rotation angle, and the target rotation angle comprises:

determining whether the target rotation angle, the initial rotation angle and the position angle meet a third preset condition;

determining the sound source enhancement area being not aligned with the far-field sound source, in response to the third preset condition being met; and

determining the sound source enhancement area being aligned with the far-field sound source, in response to the third preset condition being not met.

4. A noise reduction system for a robot having a head and a servo for controlling the head to rotate, the head being provided with a microphone array having a plurality of microphones located in beam areas on the head each being set as one of a noise suppression area and a sound source enhancement area, the system comprising a processor and a memory storing one or more computer programs executable for the processor, wherein the one or more computer programs comprises:

a position angle obtaining module configured to position a far-field sound source to obtain a position angle of the far-field sound source with respect to the microphone array;

a target rotation angle calculating module configured to calculate a target rotation angle basing on the position angle and an initial rotation angle of the servo;

a rotation control module configured to control the servo to rotate the target rotation angle to align the microphone array with the far-field sound source;

a determination module configured to determine whether the sound source enhancement area is aligned with the far-field sound source basing on the position angle, the initial rotation angle, and the target rotation angle; and

a changing module configured to change the noise suppression area currently aligned with the far-field sound source to the sound source enhancement area by changing an audio signal suppression ratio thereof, in response to the sound source enhancement area being not aligned with the far-field sound source;

wherein the target rotation angle calculating module comprises:

an initial angle obtaining module configured to obtain the initial rotation angle of the servo;

a first condition determining module configured to determine whether the position angle and the initial rotation angle meet a first preset condition; and

a processing module configured to control the sound source enhancement area to emit a beam to act on the far-field sound source, in response to the position angle and the initial rotation angle meeting the first preset condition; and

wherein the target rotation angle calculating module comprises:

a determination angle calculating unit configured to calculate a determination angle basing on the position angle and the initial rotation angle; and

a target rotation angle obtaining unit configured to calculate the target rotation angle basing on the determination angle.

5. The system of claim 4 , wherein the determination angle calculating unit comprises:

a second condition determining unit configured to determine whether the position angle meets a second preset condition;

a first calculating unit configured to set the determination angle as a sum of the position angle and the initial rotation angle, in response to the position angle meeting the second preset condition; and

a second calculating unit configured to set the determination angle as subtracting a group angle of the position angle from the initial rotation angle, in response to the position angle not meeting the second preset condition, wherein the group angle of the position angle equals to 360 minus the position angle.

6. The system of claim 4 , wherein the determination module comprises:

a determination unit configured to determine whether the target rotation angle, the initial rotation angle and the position angle meet a third preset condition;

a first determination unit configured to determine the sound source enhancement area being not aligned with the far-field sound source, in response to the third preset condition being met; and

a second determination unit configured to determine the sound source enhancement area being aligned with the far-field sound source, in response to the third preset condition being not met.

7. A terminal device for noise reduction, comprising:

a head comprising a microphone array having a plurality of microphones located in beam areas on the head each being set as one of a noise suppression area and a sound source enhancement area;

a servo for controlling the head to rotate;

one or more processors;

a memory; and

one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs comprises:

instructions for positioning a far-field sound source to obtain a position angle of the far-field sound source with respect to the microphone array;

instructions for calculating a target rotation angle basing on the position angle and an initial rotation angle of the servo;

instructions for controlling the servo to rotate the target rotation angle to align the microphone array with the far-field sound source;

instructions for determining whether the sound source enhancement area is aligned with the far-field sound source basing on the position angle, the initial rotation angle, and the target rotation angle; and

instructions for changing the noise suppression area currently aligned with the far-field sound source to the sound source enhancement area by changing an audio signal suppression ratio thereof, in response to the sound source enhancement area being not aligned with the far-field sound source;

wherein the one or more programs further comprises:

instructions for obtaining the initial rotation angle of the servo;

instructions for determining whether the position angle and the initial rotation angle meet a first preset condition; and

instructions for controlling the sound source enhancement area to emit a beam to act on the far-field sound source, in response to the position angle and the initial rotation angle meeting the first preset condition; and

wherein the one or more programs further comprises:

instructions for calculating a determination angle basing on the position angle and the initial rotation angle; and

instructions for calculating the target rotation angle basing on the determination angle.

8. The terminal device of claim 7 , wherein the instructions for calculating the determination angle basing on the position angle and the initial rotation angle comprises:

instructions for determining whether the position angle meets a second preset condition;

instructions for setting the determination angle as a sum of the position angle and the initial rotation angle, in response to the position angle meeting the second preset condition; and

instructions for setting the determination angle as subtracting a group angle of the position angle from the initial rotation angle, in response to the position angle not meeting the second preset condition, wherein the group angle of the position angle equals to 360 minus the position angle.

9. The terminal device of claim 7 , wherein the one or more programs further comprises:

instructions for determining whether the target rotation angle, the initial rotation angle and the position angle meet a third preset condition;

instructions for determining the sound source enhancement area being not aligned with the far-field sound source, in response to the third preset condition being met; and

instructions for determining the sound source enhancement area being aligned with the far-field sound source, in response to the third preset condition being not met.