System for localizing sound source and the method therefor
It is provided a system for localizing a sound source and a method therefor. The system includes a movable unit, being adapted for free movement and being integrated with a microphone; a motion tracking unit; and a processing unit, being adapted for receiving microphone signal and motion tracking unit signal and obtaining information on a direction from which sound from the sound source arrives using the microphone signal and motion tracking unit signal obtained during movement of the movable unit. By having the system and the method therefor, it is helpful for solving at least one of the technical problems: the complexity and a large volume of an acoustic camera for localization of a sound source; the restriction of the movement of the microphone in a sound source localization system.
1. A portable device for localizing a sound source in condition monitoring of the sound source, including:
a microphone;
a motion tracking unit, being adapted for tracking a movement of the portable device;
a processing unit, being adapted for receiving a microphone signal and a motion tracking unit signal and obtaining information on a direction from which sound from the sound source arrives using the received microphone signal and the received motion tracking unit signal obtained during movement of the portable device; and
wherein:
the portable device is adapted for free movement;
the processing unit is adapted for evaluating a first Doppler Effect frequency shift of a first microphone signal with respect to a first directional movement of the portable device from an initial position;
the processing unit is adapted for providing the information on the direction depending on the first Doppler Effect frequency shift of the first microphone signal and a motion tracking unit signal for the first directional movement of the portable device;
the processing unit is further adapted for evaluating a second Doppler Effect frequency shift of a second microphone signal with respect to a second directional movement of the portable device from the initial position; and
the processing unit is adapted for providing the information on the direction depending on the first Doppler Effect frequency shift and the second Doppler Effect frequency shift of the first and second microphone signals and motion tracking unit signals for the first and second directional movements of the portable device.
2. The portable device according to claim 1 , wherein the motion tracking unit is a gyroscope.
3. The portable device according to claim 2 , wherein the processing unit is adapted for evaluating a sound level of the received microphone signal with respect to a maximum and/or a minimum amplitude while the portable device is moving with respect to an initial position.
4. The portable device according to claim 3 , wherein the processing unit is adapted for providing the information on the direction depending on the sound level of the received microphone signal and the received motion tracking unit signal.
5. The portable device according to claim 1 , wherein the motion tracking unit is a vision tracking system.
6. The portable device according to claim 5 , wherein the processing unit is adapted for evaluating a sound level of the received microphone signal with respect to a maximum and/or a minimum amplitude while the portable device is moving with respect to an initial position.
7. The portable device according to claim 1 , wherein the processing unit is further adapted for evaluating a third Doppler Effect frequency shift of a third microphone signal with respect to a third directional movement of the portable device from the initial position; and
the processing unit is adapted for providing the information on the direction depending on the first, second and third Doppler Effect frequency shifts of the first, second and third microphone signals and motion tracking unit signals for the first, second and third directional movements of the portable device.
8. The portable device according to claim 1 , wherein the processing unit is adapted for evaluating a sound level of the received microphone signal with respect to a maximum and/or minimum amplitude while the portable device is moving with respect to the initial position.
9. The portable device according to claim 8 , wherein the processing unit is adapted for providing the information on the direction depending on the sound level of the received microphone signal and the received motion tracking unit signal.
10. The portable device according to claim 1 , wherein the received motion tracking unit signal includes an initial position signal and a velocity signal for the movement of the portable device.
11. The portable device according to claim 1 , further including:
a screen, being adapted for optical visualizing a position of the sound source.
12. The portable device according to claim 1 , wherein the portable device comprises a mobile phone.