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Patexia Research
Patent No. US 11303997
Issue Date Apr 12, 2022
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Patent 11303997 - Method for controlling a microphone array and device for controlling a microphone array > Claims

  • 1. A method for controlling a microphone array, comprising receiving from a tracking system position information including a position and a velocity of a moving object;receiving a plurality of microphone signals from a plurality of microphone capsules, the microphone signals comprising sound of a sound event emanating from the moving object;calculating of a directional characteristic from the plurality of microphone signals, wherein the directional characteristic is based on beamforming and has at least one preferred direction of high sensitivity corresponding to the position information, and wherein an audio output signal is generated that includes the sound coming from the preferred direction of high sensitivity; andproviding the audio output signal at an output;wherein a beam width or opening angle of the directional characteristic is variable over time and depends on the velocity of the moving object, wherein a higher velocity of the moving object results in a larger beam width or larger opening angle of the directional characteristic.
    • 2. The method according to claim 1, wherein the tracking system has a tracking latency that corresponds to a time duration between measuring the position information and receiving the measured position information at the microphone array, and wherein the beam width or opening angle of the directional characteristic depends also from the tracking latency, wherein a larger tracking latency leads to a larger beam width or larger opening angle of the directional characteristic.
    • 3. The method according to claim 1, wherein the beam width or opening angle of the directional characteristic depends also from a distance between the moving object and the microphone array, wherein a larger distance leads to a smaller beam width or smaller opening angle of the directional characteristic, and wherein the beam width or the opening angle of the directional characteristic remains above a given minimum value.
    • 4. The method according to claim 1, wherein the microphone capsules are in different microphones, each having a directional characteristic, and wherein the beam angle or opening angle of the directional characteristic is calculated and variable only in one dimension while in another dimension it is determined by a directional characteristic of the microphones.
    • 5. The method according to claim 1, wherein updated positional information is received in regular time intervals of up to 100 ms from the tracking system, and wherein the beam width or the opening angle of a beam of the directional characteristic is adapted to the updated positional information.
    • 6. The method according to claim 1, wherein the tracking system is video-based.
    • 7. The method according to claim 1, wherein the moving object is a ball, a moving playing device or a moving sports device.
    • 8. A computer-readable non-transitory storage medium having stored thereon computer-readable instructions that when executed on a computer or processor cause the computer or processor to execute the method of claim 1.
  • 9. A device for controlling a microphone array, the device comprising a first input interface for position information, the position information comprising a position and a velocity of a moving object;a second input interface comprising a plurality of inputs for microphone signals coming from a plurality of microphones;a processing unit configured for calculating a directional characteristic from the plurality of microphone signals, wherein the directional characteristic is based on beamforming and has at least one preferred direction of high sensitivity corresponding to the position information, and wherein an audio output signal comprising sound from the at least one preferred direction of high sensitivity is generated; andan output interface for providing the audio output signal;wherein a width or an opening angle of the directional characteristic is variable over time and depends on the velocity of the moving object, wherein a higher velocity of the moving object leads to a larger width or larger opening angle of the directional characteristic.
    • 10. The device according to claim 9, wherein the position information relates to a first point in time at which it was measured, and wherein the sound from the at least one preferred direction of high sensitivity results from a sound event that occurred at a second point in time different from the first point in time.
    • 11. The device according to claim 9, wherein the width or the opening angle of the directional characteristic depends also from the distance between the moving object and the microphone array, wherein a larger distance results in a smaller width or smaller opening angle of the directional characteristic, and wherein the width or opening angle of the directional characteristic remains above a given minimum value.
    • 12. The device according to claim 9, wherein the microphone capsules are in different microphones, each having a directional characteristic, and wherein the width or opening angle of the directional characteristic is calculated in only one dimension, while in another dimension it is determined by a width or an opening angle of the microphones.
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