Time Synchronization in Acoustic Localization for Mobile Open-Source Network DeploymentPublic
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Acoustic localization is a method to determine the position of a sound source via an array of acoustic sensors. In an earlier project, entitled Acoustic Localization for Mobile Open-Source Network Deployment (ALMOND), an attempt was made to develop a system for acoustic localization using cell phones as acoustic sensors. A pressing obstacle in the ALMOND project was the ability to determine the time at which audio samples were recorded from a phone's microphone. This project reduced the error in determining when individual timestamps were recorded by modifying techniques of retrieving timestamps and filtering the results. Using these methods, differences between successive timestamps always fell within 3 milliseconds of expected values and fell within 1 millisecond 99 percent of the time.
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