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Calibration method and system

  • US 9,949,050 B2
  • Filed: 03/03/2014
  • Issued: 04/17/2018
  • Est. Priority Date: 12/22/2012
  • Status: Active Grant
First Claim
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1. A method for determining the position of at least one microphone of an array of microphones, each microphone being configured to receive a signal transmitted by at least one loudspeaker, and echoes of the transmitted signal as reflected by one or more reflective surfaces, said method comprising the following steps:

  • Receiving, in a processor, an impulse response measured at the array of microphones, wherein the impulse response contains the echoes of the transmitted signal, wherein each of the echoes corresponds substantially to a Dirac in the impulse response,Sorting, in the processor, said echoes of the impulse response, by assigning each echo to one reflective surface or to a combination of reflective surfaces;

    wherein the step of sorting said echoes by assigning each echo to one reflective surface or to a combination of reflective surfaces, comprises selecting a subset of echo assignments from a set of all possible echo assignments, determining it that selected subset of echo assignment is valid by checking if the times of arrival of all of the echoes in the selected subset satisfy a predefined system of equations;

    Determining, in the processor, the position of at least one of the microphones in the array based on the assignments of the echoes to the corresponding reflective surfaces.

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