公开(公告)号：US09488716B2

公开(公告)日：2016-11-08

申请号：US14145196

申请日：2013-12-31

Applicant: GOOGLE INC.

Inventor： Nikolay D. Gaubitch ,  Willem Bastiaan Kleijn ,  Richard Heusdens

IPC: G01S5/26 ,  G01S5/18 ,  G01S5/30

CPC classification number: G01S5/18 ,  G01S5/30

Abstract: 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.

Abstract translation: 提供了使用在传感器处的多个空间分布的声学事件的飞行时间（TOF）测量来校准分布式传感器（例如，麦克风）阵列的方法和系统。 校准包括传感器的定位和增益均衡。 使用由移动声源以已知间隔发射的受控信号从空间分布的声学事件获得TOF的精确测量。 使用能够播放音频的便携式用户装置在已知的时间间隔和在不同的但任意的位置上产生多个声音事件（例如，声音点击），这是基于用户在空间中移动的装置，同时产生 声学事件。 因此，声学事件发生的时代是已知的，并且在空间上是多样的。 由声源发出的校准信号被设计成提供对噪声和混响的鲁棒性。