Automatic Microphone Selection in a Sports Camera

摘要

An audio capture system for a sports camera includes at least one “enhanced” microphone and at least one “reference” microphone. The enhanced microphone includes a drainage enhancement feature to enable water to drain from the microphone more quickly than the reference microphone. A microphone selection controller selects between the microphones based on a microphone selection algorithm to enable high quality in conditions where the sports camera transitions in and out of water during activities such as surfing, water skiing, swimming, or other wet environments.

主权项

1. A method for generating an output audio signal in an audio capture system having multiple microphones including at least a first microphone and a second microphone, the first microphone including a drainage enhancement feature structured to drain liquid more quickly than the second microphone lacking the drainage enhancement feature, the method comprising:
receiving a first audio signal from the first microphone representing ambient audio captured by the first microphone during a time interval; receiving a second audio signal from the second microphone representing ambient audio captured by the second microphone during the time interval; determining, by a processor, a correlation metric between the first audio signal and the second audio signal representing a similarity between the first audio signal and the second audio signal; responsive to the correlation metric exceeding a predefined threshold, outputting the first audio signal for the time interval; responsive to the correlation metric not exceeding the predefined threshold, determining a first noise metric for the first audio signal and a second noise metric for the second audio signal; responsive to a sum of the first noise metric and a bias value being less than the second noise metric, outputting the first audio signal for the time interval; and responsive to the sum of the first noise metric and the bias value being greater than the second noise metric, outputting the second audio signal for the time interval.