公开(公告)号：US11041916B2

公开(公告)日：2021-06-22

申请号：US16106802

申请日：2018-08-21

申请人： Massachusetts Institute of Technology

发明人： Linh M. Pham ,  Erik M. Thompson ,  John F. Barry ,  Kerry A. Johnson ,  Danielle A. Braje

IPC分类号： G01R33/00 ,  G01R33/26

摘要： Applying a bias magnetic field to a solid-state spin sensor enables vector magnetic field measurements with the solid-state spin sensor. Unfortunately, if the bias magnetic field drifts slowly, it creates noise that confounds low-frequency field measurements. Fortunately, the undesired slow drift of the magnitude of the bias magnetic field can be removed, nullified, or cancelled by reversing the direction (polarity) of the bias magnetic field at known intervals. This makes the resulting solid-state spin sensor system suitable for detecting low-frequency (mHz, for example) changes in magnetic field or other physical parameters.

公开(公告)号：US20180140233A1

公开(公告)日：2018-05-24

申请号：US15863027

申请日：2018-01-05

申请人： Massachusetts Institute of Technology

发明人： Joseph J. Lacirignola ,  Trina Rae Vian ,  Christopher J. Smalt ,  David F. Aubin, JR. ,  David C. Maurer ,  Mary Katherine Byrd ,  Christine M. Weston ,  Kerry A. Johnson ,  Shakti Davis ,  Olha Townsend ,  Paul T. Calamia ,  Edward H. Chen ,  Paula P. Collins

IPC分类号： A61B5/12 ,  G01H3/12 ,  A61B5/00

CPC分类号： A61B5/125 ,  A61B5/6814 ,  A61B5/721 ,  G01H3/12 ,  G01H3/14

摘要： Systems, apparatus, and methods for collecting, interpreting, and utilizing noise exposure data may include sensors to obtain an analog signal representative of impulse noise sound pressure and an analog signal representative of continuous noise sound pressure. At least one ADC may generate digital signals by sampling the analog signals at rates equal to or greater than twice the reciprocal of a minimum impulse noise rise time. Accelerometers may obtain data in close proximity to and remote from the sensors. At least one processor may include a first combining node to combine the digital signals to represent both the continuous noise and the impulse noise, a shock-artifact detection filter to identify a time frame including a shock artifact based on the accelerometry data, a frequency filter to generate a background-removed audio signal, an adaptive filter to estimate the shock artifact, and a second combining node to produce a shock-artifact-free audio signal.

公开(公告)号：US10264999B2

公开(公告)日：2019-04-23

申请号：US15863027

申请日：2018-01-05

申请人： Massachusetts Institute of Technology

发明人： Joseph J. Lacirignola ,  Trina Rae Vian ,  Christopher J. Smalt ,  David F. Aubin, Jr. ,  David C. Maurer ,  Mary Katherine Byrd ,  Christine M. Weston ,  Kerry A. Johnson ,  Shakti Davis ,  Olha Townsend ,  Paul T. Calamia ,  Edward H. Chen ,  Paula P. Collins

IPC分类号： G01H3/14 ,  G01H3/12 ,  A61B5/00 ,  A61B5/12

摘要： Systems, apparatus, and methods for collecting, interpreting, and utilizing noise exposure data may include sensors to obtain an analog signal representative of impulse noise sound pressure and an analog signal representative of continuous noise sound pressure. At least one ADC may generate digital signals by sampling the analog signals at rates equal to or greater than twice the reciprocal of a minimum impulse noise rise time. Accelerometers may obtain data in close proximity to and remote from the sensors. At least one processor may include a first combining node to combine the digital signals to represent both the continuous noise and the impulse noise, a shock-artifact detection filter to identify a time frame including a shock artifact based on the accelerometry data, a frequency filter to generate a background-removed audio signal, an adaptive filter to estimate the shock artifact, and a second combining node to produce a shock-artifact-free audio signal.