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21. 发明授权

US10820270B2 Preamble detector 有权
公开(公告)号：US10820270B2
公开(公告)日：2020-10-27
申请号：US16365133
申请日：2019-03-26
申请人： Silicon Laboratories Inc.
发明人： Partha Sarathy Murali
IPC分类号： G08C17/00 , H04W52/02 , H04L1/00
摘要： A wireless receiver has a preamble detection apparatus and method which waits until the expected arrival of a beacon frame, after which power is cyclically applied during a preamble detection interval and a sleep interval until a preamble is detected. The preamble detector has a first mode with a longer preamble detection interval and a second mode with a shorter preamble detection interval. During the preamble detection interval, power is applied to receiver components, and during the sleep interval, power is not applied. The duration of the preamble detection interval is equal to a preamble sensing interval, and if a preamble is detected, power remains applied to a preamble processor for a preamble processing interval. The duration of the sleep interval is the duration of a long preamble less the sum of two times the preamble detection interval plus the preamble processing interval. Phase lock loop (PLL) power is applied a PLL settling time prior to and during the preamble detection interval.

22. 发明授权

US10806625B1 Apparatus and method for remote pressure control of a fluidic bladder 有权
公开(公告)号：US10806625B1
公开(公告)日：2020-10-20
申请号：US14957556
申请日：2015-12-02
申请人： Vasper Systems, LLC
发明人： Jay A. Chesavage , Marshall Lise , Gregory A. Chesavage
IPC分类号： A61F7/00 , A61F7/02
摘要： A bladder pressure estimator has in sequence a pump, a first hose, a supply pressure sensor, a second hose, a bladder having an inlet coupled to the second hose, a bladder outlet coupled to a third hose of substantially equal length to the second hose, a return pressure sensor, and a fourth hose coupled to the return pressure sensor and returning fluid from the pump to the reservoir. A pressure estimate is formed by establishing the second hose length and inner diameter as the same as the third hose length and inner diameter, and forming the pressure estimate by averaging the supply pressure and return pressure. In an alternative embodiment, a control regulator forms an error signal from the difference between a setpoint and the average of the supply and return pressures. A head pressure measurement may be done by turning the pump off after a steady state reading is made.

23. 发明授权

US10805884B2 Power-save system for detection of bluetooth long range packets 有权
公开(公告)号：US10805884B2
公开(公告)日：2020-10-13
申请号：US16538797
申请日：2019-08-12
申请人： Silicon Laboratories Inc.
发明人： Partha Sarathy Murali , SuryaNarayana Varma Nallaparaju
IPC分类号： H04W52/02 , H04W4/80 , H04B7/00 , H04W84/12
摘要： A preamble detector for a Bluetooth Long Range includes a receiver for forming baseband samples from Bluetooth packets and a preamble detect controller for enabling and disabling power to the receiver. Where the preamble duration is Tcyc, the preamble detector turns on for a preamble detect time T1 and turns off for a duration T2, where T2=Tcyc−2*T1. A series of hierarchical decisions is made on sequentially increasing intervals of time based on an accumulated correlation result of correlating the baseband samples against a SYNC sequence to power the receiver back down before the end of the T1 period when the accumulated correlation result is below a threshold and continues to a subsequent correlation interval when the accumulated correlation result is above a threshold, where the threshold is established to have at least a 20% false alarm rate for preamble detection.

24. 发明授权

US10801267B1 Drill for characterization of materials 有权
公开(公告)号：US10801267B1
公开(公告)日：2020-10-13
申请号：US16004108
申请日：2018-06-08
申请人： Intelligent Fiber Optic Systems, Inc.
发明人： Richard J. Black , Behzad Moslehi
IPC分类号： E21B10/48 , G01L1/24 , E21B41/00 , G01L1/10 , G01L5/12 , E21B10/44
摘要： A drill has a stationary drive mechanism coupled to a rotating drill, the rotating drill having a serpentine optical fiber positioned on an inner shell having a serpentine groove with fiber Bragg gratings (FBGs) coupled to the inner shell and arranged parallel to the central axis of rotation for measurement of axial forces and also positioned circumferentially for measurement of drill torque. The FBGs are arranged on a single optical fiber and coupled to a broadband optical source such that reflected optical energy is directed to an interrogator for estimate of strain at each FBG. The FBG responses may also be examined dynamically to estimate material hardness during a drilling operation.

25. 发明授权

US10742429B2 Ultra low power mesh network 有权
公开(公告)号：US10742429B2
公开(公告)日：2020-08-11
申请号：US15811690
申请日：2017-11-14
申请人： Silicon Laboratories Inc.
发明人： Partha Sarathy Murali , Ajay Mantha , Nagaraj Reddy Anakala , Subba Reddy Kallam , Venkat Mattela
IPC分类号： H04L12/12 , H04W84/12 , H04W4/80 , H04W84/18
摘要： A mesh receiver has a wakeup receiver for reception of a wakeup sequence formed by keyed RF or a sequence of wireless packets and gaps, a transmitter forming low speed RF wakeup sequence to other mesh stations, a mesh receiver for reception of high speed WLAN packets, the transmitter sending a wireless ACK packet in response to a wakeup sequence, the mesh receiver thereafter receiving wireless packets from a remote station, the mesh transmitter sending an ACK, the mesh station thereafter identifying a next hop station, and sending a wakeup sequence to that station, after receipt of an ACK, sending the data, the mesh receiver and mesh transmitter thereafter going to sleep.

26. 发明授权

US10708780B2 Registration of an internet of things (IoT) device using a physically uncloneable function 有权
公开(公告)号：US10708780B2
公开(公告)日：2020-07-07
申请号：US15883092
申请日：2018-01-29
申请人： Silicon Laboratories Inc.
发明人： Sriram Mudulodu , Venkat Mattela
IPC分类号： H04W4/00 , H04W12/06 , H04L9/32 , H04W12/04
摘要： An Internet of Things (IoT) device has a public device identifier and a private device identifier, where the public device identifier is publicly available and the private device identifier is secret but kept in a secure device database as a tuple. A registration request containing encrypted credentials comprising at least a private identifier and optionally a public identifier is sent from the IoT device to an association server in communication with a device database having an association between IoT public identifier and a corresponding IoT private identifier. The association server which receives the registration request and encrypted credentials responds with a registration acknowledgement when the decrypted credentials match the tuple in the device database, or forwards the request to a registration server when it does not. The requesting IoT device receives an acknowledgement and is thereafter able to join the wireless network.

27. 发明授权

US10541708B1 Decompression engine for executable microcontroller code 有权
公开(公告)号：US10541708B1
公开(公告)日：2020-01-21
申请号：US16140526
申请日：2018-09-24
申请人： Redpine Signals, Inc.
发明人： Subba Reddy Kallam , Sriram Mudulodu
IPC分类号： H03M7/00 , H03M7/30 , G06F9/30 , G06F9/22 , G06F16/901
摘要： A code decompression engine reads compressed code from a memory containing a compressed code part and a dictionary part. The compressed code part contains a series of instructions being either an uncompressed instruction preceded by an uncompressed code bit, or a compressed instruction having a compressed code bit followed by a number of segments field followed by segments, followed by a directory index indication a directory location to read. Each segment consists of a mask type, a mask offset, and a mask.

28. 发明授权

US10528641B2 Encoder and decoder for transmission of coefficients to a neural network 有权
公开(公告)号：US10528641B2
公开(公告)日：2020-01-07
申请号：US15979257
申请日：2018-05-14
申请人： Redpine Signals, Inc.
发明人： Jay A. Chesavage
IPC分类号： G06F7/00 , G06F17/15 , G06F7/483 , G06N3/04
摘要： A method for efficient transmission of coefficients examines a coefficient list, presents the coefficients as binary floating point representation, and transmits the list of coefficients as a header having an exponent prefix, a fractional suffix, and each coefficient value as an exponent suffix and fractional prefix. A method for reception of coefficients receives a header including an exponent prefix, a fractional suffix, thereafter receiving each value as a sign bit, an exponent suffix and a fractional prefix, reconstituting an approximation of the original value, in sequence, as a sign bit, exponent prefix exponent suffix, fraction prefix, and fraction suffix, thereby greatly reducing the amount of information to be transmitted or received.

29. 发明授权

US10491174B1 Multi-beam power grid tube for high power and high frequency operation 有权
公开(公告)号：US10491174B1
公开(公告)日：2019-11-26
申请号：US15496142
申请日：2017-04-25
申请人： Calabazas Creek Research, Inc.
发明人： R. Lawrence Ives
IPC分类号： H03F3/189 , H01J19/38 , H01J19/062
CPC分类号： H03F3/189 , H01J19/062 , H01J19/38 , H03F2200/451
摘要： A multi-beam triode for RF amplification has plurality of electron beams generated by a thermionic cathode, each electron beam travelling through an associated grid and to a common anode electrode. An input RF energy is coupled to a grid support which is electrically common to a control grid of each electron beam, and RF is coupled out of the grid—anode gap, with suitable input RF matching cavities and output RF matching cavities provided.

30. 发明授权

US10425895B2 Power-save system for detection of Bluetooth long range packets 有权
公开(公告)号：US10425895B2
公开(公告)日：2019-09-24
申请号：US16221561
申请日：2018-12-16
申请人： Redpine Signals, Inc.
发明人： Partha Sarathy Murali , SuryaNarayana Varma Nallajaraju
IPC分类号： H04W52/02 , H04W4/80
摘要： A preamble detector for a Bluetooth Long Range includes a receiver for forming baseband samples from Bluetooth packets and a preamble detect controller for enabling and disabling power to the receiver. Where the preamble duration is Tcyc, the preamble detector turns on for a preamble detect time T1 and turns off for a duration T2, where T2=Tcyc−2*T1. A series of hierarchical decisions is made on sequentially increasing intervals of time based on an accumulated correlation result of correlating the baseband samples against a SYNC sequence to power the receiver back down before the end of the T1 period when the accumulated correlation result is below a threshold and continues to a subsequent correlation interval when the accumulated correlation result is above a threshold, where the threshold is established to have at least a 20% false alarm rate for preamble detection.

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