Microphone autolocalization using moving acoustic source

摘要

Provided are methods and systems for calibrating a distributed sensor (e.g., microphone) array using time-of-flight (TOF) measurements for a plurality of spatially distributed acoustic events at the sensors. The calibration includes localization and gain equalization of the sensors. Accurate measurements of TOFs are obtained from spatially distributed acoustic events using a controlled signal emitted at known intervals by a moving acoustic source. A portable user device capable of playing out audio is used to produce a plurality of acoustic events (e.g., sound clicks) at known intervals of time and at different, but arbitrary locations based on the device being moved around in space by a user while producing the acoustic events. As such, the times of the acoustic event generation are known, and are spatially diverse. The calibration signals emitted by the acoustic source are designed to provide robustness to noise and reverberation.

主权项

1. A computer-implemented method comprising:
determining registered arrival times of a set of acoustic events at a set of sensors, wherein the acoustic events are generated at time intervals known to the sensors; calculating times of flight for the acoustic events to reach the sensors based on the registered arrival times of the acoustic events at the sensors, event generation times for the acoustic events, and estimated internal delays of the sensors; and using the calculated times of flight to determine locations of the sensors.