Omni-directional audible noise source localization apparatus
Systems and methods for an equipment capable of simultaneous measurements of surround sound reproduction and noise source localization in closed or open space. The systems and methods are particularly used when surround sound reproduction and noise source localization are required in a moving object of a closed space. A moving object in a closed space is not limited to a specific product, as for example, an automobile, a train, an elevator, or the like can be considered.
1. A system, comprising:
a microphone array comprising at least four microphones arranged along locations with respect to each other in a three dimensional shape;
a 360 degree camera configured to provide video feed having a full 360 degree field of view coverage; and
a processor, configured to:
for audio received through the microphone array, calculate three dimensional sound intensity between at least two of the at least four microphones of the microphone array, the three dimensional sound representative of intensity amount and direction of the acoustic energy flow from each localized sound source in the audio; and
overlay the audio on video feed of the 360 degree camera with the three dimensional sound intensity with respect to a displayed view of the video feed;
wherein the processor is configured to calculate the three dimensional sound intensity between the at least two of the at least four microphones of the microphone array by calculating the three dimensional sound intensity based on an inverse Fourier transform of a cross spectrum of the sound pressure measured by the at least two of the at least four microphones.
2. The system of claim 1 , wherein the three dimensional shape is a regular tetrahedron.
3. The system of claim 1 , wherein the microphone array is an ambisonics microphone consisting of four microphones.
4. The system of claim 1 , wherein the processor is configured to overlay the audio on the video feed of the 360 degree camera with the three dimensional sound intensity with respect to a displayed view of the video feed through a heat map representation of the three dimensional sound intensity on the video feed.
5. A method for a system comprising a microphone array comprising at least four microphones arranged along locations with respect to each other in a three dimensional shape, and a 360 degree camera configured to provide video feed having a full 360 degree field of view coverage; the method comprising:
for audio received through the microphone array, calculating three dimensional sound intensity between at least two of the at least four microphones of the microphone array, the three dimensional sound representative of intensity amount and direction of the acoustic energy flow from each localized sound source in the audio; and
overlaying the audio on video feed of the 360 degree camera with the three dimensional sound intensity with respect to a displayed view of the video feed;
wherein the calculating the three dimensional sound intensity between the at least two of the at least four microphones of the microphone array comprises calculating the three dimensional sound intensity based on an inverse Fourier transform of a cross spectrum of the sound pressure measured by the at least two of the at least four microphones.
6. The method of claim 5 , wherein the three dimensional shape is a regular tetrahedron.
7. The method of claim 5 , wherein the microphone array is an ambisonics microphone consisting of four microphones.
8. The method of claim 5 , wherein the overlaying the audio on the video feed of the 360 degree camera with the three dimensional sound intensity with respect to a displayed view of the video feed through a heat map representation of the three dimensional sound intensity on the video feed.
9. A system, comprising:
a microphone array comprising at least four microphones arranged along locations with respect to each other in a three dimensional shape;
a 360 degree camera configured to provide video feed having a full 360 degree field of view coverage; and
a processor, configured to:
for audio received through the microphone array, calculate three dimensional sound intensity between at least two of the at least four microphones of the microphone array, the three dimensional sound representative of intensity amount and direction of the acoustic energy flow from each localized sound source in the audio; and
overlay the audio on video feed of the 360 degree camera with the three dimensional sound intensity with respect to a displayed view of the video feed;
wherein the processor is configured to calculate the three dimensional sound intensity between the at least two of the at least four microphones of the microphone array by:
calculating a sound pressure of an acoustic center of the microphone array;
deriving a particle velocity between each of the at least four microphones of the microphone array and the acoustic center; and
calculating the three dimensional sound intensity from particle velocity calculations along an x, y and z axis based on the derived velocity between the each of the at least four microphones of the microphone array and the acoustic center.
10. The system of claim 9 , wherein the three dimensional shape is a regular tetrahedron.
11. The system of claim 9 , wherein the microphone array is an ambisonics microphone consisting of four microphones.
12. The system of claim 9 , wherein the processor is configured to overlay the audio on the video feed of the 360 degree camera with the three dimensional sound intensity with respect to a displayed view of the video feed through a heat map representation of the three dimensional sound intensity on the video feed.
13. A method for a system comprising a microphone array comprising at least four microphones arranged along locations with respect to each other in a three dimensional shape, and a 360 degree camera configured to provide video feed having a full 360 degree field of view coverage; the method comprising:
for audio received through the microphone array, calculating three dimensional sound intensity between at least two of the at least four microphones of the microphone array, the three dimensional sound representative of intensity amount and direction of the acoustic energy flow from each localized sound source in the audio; and
overlaying the audio on video feed of the 360 degree camera with the three dimensional sound intensity with respect to a displayed view of the video feed;
wherein the calculating the three dimensional sound intensity between the at least two of the at least four microphones of the microphone array comprises:
calculating a sound pressure of an acoustic center of the microphone array;
deriving a particle velocity between each of the at least four microphones of the microphone array and the acoustic center; and
calculating the three dimensional sound intensity from particle velocity calculations along an x, y and z axis based on the derived velocity between the each of the at least four microphones of the microphone array and the acoustic center.
14. The method of claim 13 , wherein the three dimensional shape is a regular tetrahedron.
15. The method of claim 13 , wherein the microphone array is an ambisonics microphone consisting of four microphones.