Microphone calibration
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United States of America Patent
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Jan 5, 2016
Grant Date -
Jan 29, 2015
app pub date -
Jul 28, 2014
filing date -
Jul 26, 2013
priority date (Note) -
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Abstract
The disclosed apparatus, systems, and methods provide a calibration technique for calibrating a set of microphones. The disclosed calibration technique is configured to calibrate the microphones with respect to a reference microphone and can be used in actual operation rather than a testing environment. The disclosed calibration technique can estimate both the magnitude calibration factor for compensating magnitude sensitivity variations and the relative phase error for compensating phase delay variations. In addition, the disclosed calibration technique can be used even when multiple acoustic sources are present. The disclosed technique is particularly well suited to calibrating a set of microphones that are omnidirectional and sufficiently close to one another.
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