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公开(公告)号：US10816639B2
公开(公告)日：2020-10-27
申请号：US16773691
申请日：2020-01-27
Applicant: Chirp Microsystems, Inc.
Inventor： Richard J. Przybyla , David A. Horsley , Mitchell H. Kline
Abstract: A tracking method is disclosed. The method may include displaying visual content on a screen. A base station may be stationary with respect to the screen while the visual content is being displayed. In contrast, one or more objects may move with respect to the screen while the visual content is being displayed. The one or more objects may be tracked so that the movement thereof may be used to alter the visual content. Such tracking may involve the base station and the one or more objects sending and/or receiving one or more ultrasonic pulses. Time-difference-of-arrival and/or time-of-flight of the one or more ultrasonic pulses may then be used to estimate a relative location and/or a relative orientation of the one or more objects with respect to the base station in three dimensional space.
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公开(公告)号：US10901064B2
公开(公告)日：2021-01-26
申请号：US15354892
申请日：2016-11-17
Applicant: Chirp Microsystems, Inc.
Inventor： Richard J. Przybyla , Ryan Young , Mitchell H. Kline , David A. Horsley
Abstract: Time of flight between two or more ultrasonic transceivers is measured using known delays between receiving a trigger and sending an ultrasonic pulse in reply. A receive time is measured from a beginning of a receive phase in which the pulse is detected until receipt of an ultrasonic reply pulse. A trip time is determined from a sum of the receive time and a difference between a known first reference period for a transceiver that sends the trigger pulse and a second know reference period for a second transceiver that sends the reply pulse. The second reference period corresponds to a delay between when the second transceiver receives the initial or subsequent trigger pulse from the first transceiver and when the second transceiver sends the reply pulse.
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公开(公告)号：US20200064439A1
公开(公告)日：2020-02-27
申请号：US16463321
申请日：2017-11-27
Applicant: Chirp Microsystems, Inc.
Inventor： Richard J. Przybyla , Mitchell H. Kline , David A. Horsley
Abstract: A tracking method includes displaying visual content on a screen of a head mounted display (HMD). One or more base stations may be stationary with respect to the screen while the visual content is being displayed. In contrast, one or more objects may move with respect to the screen while the visual content is being displayed. Time-difference-of-arrival (TDoA) and/or time-of-flight (ToF) may be measured for one or more ultrasonic pulses transmitted from the base station, one or more objects, or HMD. Position and orientation of the objects and HMD may be calculated based on the TDoA and ToF. Different frequencies of pulses may be used to locate the HMD and the objects. An electromagnetic synchronization signal from the HMD and/or base station may be used to measure TDoA. Position and orientation measurements may be fused with outputs from IMUS (inertial measurement units) to reduce jitter.
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Patent Agency Ranking
公开(公告)号：US10751755B1
公开(公告)日：2020-08-25
申请号：US15466040
申请日：2017-03-22
Applicant: Chirp Microsystems, Inc.
Inventor： David A. Horsley , Andre Guedes , Meng-Hsiung Kiang , Richard Przybyla , Stefon Shelton
IPC: H01L41/09 , B06B1/06 , H01L41/113 , B06B1/02
Abstract: An apparatus comprises an ultrasonic transducer having a first and second electrode and switches which configured to selectively connect the first and second electrodes to a transmit voltage source or to a receive amplifier. The switches are configured to selectively connect a first input of the amplifier to the first electrode of the transducer and to selectively connect a second input of the amplifier to the second electrode of the transducer. The switches are also configured to selectively connect the voltage source to the first and second electrodes of the transducer. The transducer may include a piezoelectric layer attached to and sandwiched between the first electrode and the second electrode, and a flexible membrane attached to the first electrode. The piezoelectric layer may be patterned to form an annular ring at the outer diameter of the flexible membrane.
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公开(公告)号：US11016167B2
公开(公告)日：2021-05-25
申请号：US16463321
申请日：2017-11-20
Applicant: Chirp Microsystems, Inc.
Inventor： Richard J. Przybyla , Mitchell H. Kline , David A. Horsley
IPC: G01S5/26 , G01S5/02 , G01S5/00 , G01S5/30 , G01S5/18 , G01S11/16 , H04W56/00 , G06F3/00 , G06K9/00
Abstract: A tracking method includes displaying visual content on a screen of a head mounted display (HMD). One or more base stations may be stationary with respect to the screen while the visual content is being displayed. In contrast, one or more objects may move with respect to the screen while the visual content is being displayed. Time-difference-of-arrival (TDoA) and/or time-of-flight (ToF) may be measured for one or more ultrasonic pulses transmitted from the base station, one or more objects, or HMD. Position and orientation of the objects and HMD may be calculated based on the TDoA and ToF. Different frequencies of pulses may be used to locate the HMD and the objects. An electromagnetic synchronization signal from the HMD and/or base station may be used to measure TDoA. Position and orientation measurements may be fused with outputs from IMUS (inertial measurement units) to reduce jitter.
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公开(公告)号：US20210165069A1
公开(公告)日：2021-06-03
申请号：US17156242
申请日：2021-01-22
Applicant: Chirp Microsystems, Inc.
Inventor： Richard J. Przybyla , Ryan Young , Mitchell H. Kline , David A. Horsley
Abstract: Time of flight between two or more ultrasonic transceivers is measured using known delays. First and second transceivers are duty cycled, each having a respective receive period that is less than a measurement period during which the transceivers are configured to receive transmissions. An ultrasonic trigger pulse is transmitted by the first transceiver. The second transceiver, upon receiving the trigger pulse, transmits an ultrasonic response pulse after a first predefined delay time that is known to the first transceiver and greater than the receive period of the second transceiver. Subsequently, the first transceiver receives the ultrasonic response pulse and determines a receive time. The first transceiver determines the distance between the first transceiver and the second transceiver from a speed of sound, an elapsed time between the time of transmission of the trigger pulse and the receive time, and the first predetermine delay time.
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公开(公告)号：US20200166603A1
公开(公告)日：2020-05-28
申请号：US16773691
申请日：2020-01-27
Applicant: Chirp Microsystems, Inc.
Inventor： Richard J. Przybyla , David A. Horsley , Mitchell H. Kline
Abstract: A tracking method is disclosed. The method may include displaying visual content on a screen. A base station may be stationary with respect to the screen while the visual content is being displayed. In contrast, one or more objects may move with respect to the screen while the visual content is being displayed. The one or more objects may be tracked so that the movement thereof may be used to alter the visual content. Such tracking may involve the base station and the one or more objects sending and/or receiving one or more ultrasonic pulses. Time-difference-of-arrival and/or time-of-flight of the one or more ultrasonic pulses may then be used to estimate a relative location and/or a relative orientation of the one or more objects with respect to the base station in three dimensional space.
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公开(公告)号：US20170343637A1
公开(公告)日：2017-11-30
申请号：US15354892
申请日：2016-11-17
Applicant: Chirp Microsystems, Inc.
Inventor： Richard J. Przybyla , Ryan Young , Mitchell H. Kline , David A. Horsley
IPC: G01S3/808
CPC classification number: G01S3/808 , G01S5/30 , G01S15/876
Abstract: Time of flight between two or more ultrasonic transceivers is measured using known delays between receiving a trigger and sending an ultrasonic pulse in reply. A receive time is measured from a beginning of a receive phase in which the pulse is detected until receipt of an ultrasonic reply pulse. A trip time is determined from a sum of the receive time and a difference between a known first reference period for a transceiver that sends the trigger pulse and a second know reference period for a second transceiver that sends the reply pulse. The second reference period corresponds to a delay between when the second transceiver receives the initial or subsequent trigger pulse from the first transceiver and when the second transceiver sends the reply pulse.
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