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21.发明申请公开(公告)号：US20200296513A1
公开(公告)日：2020-09-17
申请号：US16819665
申请日：2020-03-16
发明人： Robert J. Littrell , Michael Carfore , Shuwan Xue
IPC分类号： H04R3/06 , H04R17/02 , G01R19/02 , H01L41/113 , H01L41/04
摘要： A device that includes an adaptive acoustic detection circuit and an acoustic sensor device such as a microphone is described. The device includes in addition to the sensor a circuit configured to detect when an input stimulus to the sensor satisfies an adaptive threshold, and further configured to produce a signal upon detection that causes adjustment of performance of the device, wherein the adaptive threshold is a threshold value that varies over time in accordance with detected changes to sound of an environment in which the device is located.
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22.发明授权公开(公告)号：US10715922B2
公开(公告)日：2020-07-14
申请号：US16081015
申请日：2017-02-28
发明人： Robert J. Littrell , Ronald Gagnon , Karl Grosh
摘要： A device comprising: a sensor; and a first circuit configured to detect when an input stimulus to the sensor satisfies one or more detection criteria, and further configured to produce a signal upon detection that causes adjustment of performance of the device; and a second circuit for processing input following detection, wherein the second circuit is configured to increase its power level following detection, relative to a power level of the second circuit prior to detection.
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公开(公告)号：US11665968B2
公开(公告)日：2023-05-30
申请号：US17180193
申请日：2021-02-19
发明人： Karl Grosh , Robert J. Littrell
IPC分类号： H01L41/083 , H01L41/187 , H01L41/113 , H04R17/00 , H04R17/02 , B81B7/00 , B81B7/02 , B81B3/00
CPC分类号： H01L41/083 , B81B3/0021 , B81B7/0032 , B81B7/02 , H01L41/1132 , H01L41/1136 , H01L41/1138 , H01L41/187 , H04R17/00 , H04R17/02 , B81B2201/0257 , B81B2203/0127 , B81B2203/0315 , B81B2203/04 , B81B2207/09 , H04R2201/003
摘要： A microphone including a casing having a front wall, a back wall, and a side wall joining the front wall to the back wall, a transducer mounted to the front wall, the transducer including a substrate and a transducing element, the transducing element having a transducer acoustic compliance dependent on the transducing element dimensions, a back cavity cooperatively defined between the back wall, the side wall, and the transducer, the back cavity having a back cavity acoustic compliance. The transducing element is dimensioned such that the transducing element length matches a predetermined resonant frequency and the transducing element width, thickness, and elasticity produces a transducer acoustic compliance within a given range of the back cavity acoustic compliance.
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公开(公告)号：US20220308084A1
公开(公告)日：2022-09-29
申请号：US17807319
申请日：2022-06-16
发明人： Robert J. Littrell
摘要： A sensor device that senses proper acceleration. The sensor device includes a substrate, a spacer layer supported over a first surface of the substrate, at least a first tapered cantilever beam element having a base and a tip, the base attached to the spacer layer, and which is supported over and spaced from the substrate by the spacer layer. The at least first tapered cantilever beam element tapers in width from the base portion to the tip portion. The at least first cantilever beam element further including at least a first layer comprised of a piezoelectric material, a pair of electrically conductive layers disposed on opposing surfaces of the first layer, and a mass supported at the tip portion of the at least first tapered cantilever beam element.
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25.发明授权公开(公告)号：US11418882B2
公开(公告)日：2022-08-16
申请号：US16819665
申请日：2020-03-16
发明人： Robert J. Littrell , Michael Carfore , Shuwan Xue
摘要： A device that includes an adaptive acoustic detection circuit and an acoustic sensor device such as a microphone is described. The device includes in addition to the sensor a circuit configured to detect when an input stimulus to the sensor satisfies an adaptive threshold, and further configured to produce a signal upon detection that causes adjustment of performance of the device, wherein the adaptive threshold is a threshold value that varies over time in accordance with detected changes to sound of an environment in which the device is located.
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26.发明申请公开(公告)号：US20220248145A1
公开(公告)日：2022-08-04
申请号：US17675850
申请日：2022-02-18
发明人： Karl Grosh , Robert J. Littrell
IPC分类号： H04R17/02 , H04R7/06 , H01L41/27 , H01L41/314 , H01L41/332 , H04R31/00
摘要： A transducer of the preferred embodiment including a transducer and a plurality of adjacent, tapered cantilevered beams. Each of the beams define a beam base, a beam tip, and a beam body disposed between the beam base and the beam tip. The beams are arranged such that each of the beam tips extends toward a common area. Each beam is joined to the substrate along the beam base and is free from the substrate along the beam body. A preferred method of manufacturing a transducer can include: depositing alternating layers of piezoelectric and electrode onto the substrate in block, processing the deposited layers to define cantilever geometry in block, depositing metal traces in block, and releasing the cantilevered beams from the substrate in block.
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公开(公告)号：US20210382972A1
公开(公告)日：2021-12-09
申请号：US17339813
申请日：2021-06-04
发明人： Robert J. Littrell , Mathew Crowley
摘要： Techniques for biometric authentication using a voice accelerometer and an acoustic transducer includes receiving a first signal representing an output by a voice accelerometer of a device and a second signal representing an output by an acoustic transducer of the device. Characteristics of each of the first signal and the second signal are compared with stored biometric characteristics for a user of the device. The user of the device is then authenticated based on the comparison.
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公开(公告)号：US20210306759A1
公开(公告)日：2021-09-30
申请号：US16334678
申请日：2017-10-06
发明人： Ronald Gagnon , Chen-Wei Huang
摘要： A device includes: a piezoelectric transducer; a field effect transistor (FET) configured to provide a sub-threshold conduction path for leakage current across the piezoelectric transducer; wherein the FET comprises a gate; wherein each of a width and a length of the gate has a size in accordance with the sub-threshold conduction path being configured to substantially maintain an input voltage to the piezoelectric transducer across a path of the leakage current of the piezoelectric transducer.
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公开(公告)号：US20210273152A1
公开(公告)日：2021-09-02
申请号：US17180193
申请日：2021-02-19
发明人： Karl Grosh , Robert J. Littrell
IPC分类号： H01L41/083 , H01L41/187 , H01L41/113 , H04R17/00 , H04R17/02 , B81B7/00 , B81B7/02 , B81B3/00
摘要： A microphone including a casing having a front wall, a back wall, and a side wall joining the front wall to the back wall, a transducer mounted to the front wall, the transducer including a substrate and a transducing element, the transducing element having a transducer acoustic compliance dependent on the transducing element dimensions, a back cavity cooperatively defined between the back wall, the side wall, and the transducer, the back cavity having a back cavity acoustic compliance. The transducing element is dimensioned such that the transducing element length matches a predetermined resonant frequency and the transducing element width, thickness, and elasticity produces a transducer acoustic compliance within a given range of the back cavity acoustic compliance.
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公开(公告)号：US10964880B2
公开(公告)日：2021-03-30
申请号：US16196922
申请日：2018-11-20
发明人： Karl Grosh , Robert J. Littrell
IPC分类号： H01L41/083 , H01L41/187 , H01L41/113 , H04R17/00 , H04R17/02 , B81B7/00 , B81B7/02 , B81B3/00
摘要： A microphone including a casing having a front wall, a back wall, and a side wall joining the front wall to the back wall, a transducer mounted to the front wall, the transducer including a substrate and a transducing element, the transducing element having a transducer acoustic compliance dependent on the transducing element dimensions, a back cavity cooperatively defined between the back wall, the side wall, and the transducer, the back cavity having a back cavity acoustic compliance. The transducing element is dimensioned such that the transducing element length matches a predetermined resonant frequency and the transducing element width, thickness, and elasticity produces a transducer acoustic compliance within a given range of the back cavity acoustic compliance.
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