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Microphone calibration

  • US 9,232,332 B2
  • Filed: 07/28/2014
  • Issued: 01/05/2016
  • Est. Priority Date: 07/26/2013
  • Status: Active Grant
First Claim
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1. An apparatus comprising:

  • an interface configured to receive a first digitized signal stream and a second digitized signal stream, wherein the first digitized signal stream and the second digitized signal stream correspond to an acoustic signal captured by a first microphone and a second microphone, respectively;

    a processor, in communication with the interface, configured to run a module stored in memory, wherein the module is configured to;

    determine a first time-frequency representation of the first digitized signal stream and a second time-frequency representation of the second digitized signal stream, wherein the first time-frequency representation indicates a magnitude of the first digitized signal stream for a plurality of frequencies at a plurality of time frames, and wherein the second time-frequency representation indicates a magnitude of the second digitized signal stream for the plurality of frequencies for the plurality of time frames;

    determine a relationship between the first time-frequency representation and the second time-frequency representation at the plurality of time frames for a first of the plurality of frequencies; and

    determine a magnitude calibration factor between the first microphone and the second microphone for the first of the plurality of frequencies based on the relationship between the first time-frequency representation and the second time-frequency representation.

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