公开(公告)号：US11378686B2

公开(公告)日：2022-07-05

申请号：US16232308

申请日：2018-12-26

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Lei Ding ,  Srinath Mathur Ramaswamy ,  Anand Dabak

IPC: G01S17/58 ,  G01S17/93 ,  G01S7/53 ,  G01S15/58 ,  G01S15/931

Abstract: An ultrasound detect circuit includes a decimator that decimates a transmit signal to be transmitted through an ultrasonic transducer. The transmit signal is decimated to generate first and second template signals. The decimator uses a different decimation ratio to generate the first template signal than the second template signal. The circuit also includes a first correlator to correlate a signal derived from the ultrasonic transducer with the first template signal, aa second correlator to correlate the signal derived from the ultrasonic transducer with the second template signal, and a Doppler shift determination circuit to determine a Doppler frequency shift based on an output from the first correlator and an output from the second correlator.

公开(公告)号：US11346941B2

公开(公告)日：2022-05-31

申请号：US16364613

申请日：2019-03-26

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Lei Ding ,  Srinath Mathur Ramaswamy ,  Anand Gopalan ,  Michael John Zroka

IPC: G01S15/00 ,  G01S15/10 ,  G01S7/524

Abstract: Ultrasonic sensing systems and associated methods provide side-lobe reduction to improve the acoustic detection of small objects, the signature envelope peaks of which can otherwise be obscured by subsidiary envelope peaks in side lobes that result from residual correlation between a signal received by an ultrasonic transducer and a template signal corresponding to a burst signal emitted by the ultrasonic transducer. A shaping signal by which the amplitude of the burst signal can be varied with respect to time is taken into account in the template signal, and correlator circuitry correlates a signal derived from the ultrasonic transducer with the template signal to produce a correlated output exhibiting the desired side-lobe reduction. The distance from the transducer to the detected object can thereby be determined with enhanced accuracy and responsiveness.

公开(公告)号：US20200225345A1

公开(公告)日：2020-07-16

申请号：US16426779

申请日：2019-05-30

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： LEI DING ,  Srinath Mathur Ramaswamy ,  Anand Gopalan ,  Vaibhav Garg ,  Anand Ganesh Dabak

IPC: G01S15/10 ,  G01S7/526

Abstract: Ultrasonic ranging systems and methods that use coding to distinguish emitted bursts from multiple transducers temporally stagger the bursts emitted from the transducers. The stagger delay between bursts from different transducers in a sensing frame can be randomized between different sensing frames to prevent blind zones. The stagger delay can be relatively small (e.g., between 3 ms and 10 ms) as compared to delays required between bursts in a single-tone ranging system (which would need to be more on the order of between 30 ms and 40 ms, depending on the maximum detecting range of the ranging system). The coding of bursts can be selected to utilize the entire bandwidth of the bursting transducer so as to preserve short-range sensitivity over transducer ringing. Schemes in which some transducers in a system only listen for bursts from other transducers but do not themselves burst within a sensing frame are also described.

公开(公告)号：US10700743B2

公开(公告)日：2020-06-30

申请号：US16158008

申请日：2018-10-11

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Pourya Assem ,  Hun Seok Kim ,  Jing-Fei Ren ,  Srinath Mathur Ramaswamy

IPC: H04B5/00 ,  H04B17/318 ,  H04W4/02 ,  H04W4/80 ,  H04B17/27

Abstract: Methods and apparatus to determine nearfield localization using phase and received signal strength indication (RSSI) diversity are disclosed. An example method includes determining a first strength of an electric field and a second strength of a magnetic field, the electric field and the magnetic field associated with an electromagnetic signal sent from a transmitter; determining a difference between the first strength and the second strength; and determining a transmitter distance based on the difference between the first strength and the second strength.

公开(公告)号：US10677902B2

公开(公告)日：2020-06-09

申请号：US15659919

申请日：2017-07-26

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Lei Ding ,  Srinath Mathur Ramaswamy

IPC: G01S7/52 ,  G01S15/89

Abstract: An ultrasonic detection circuit includes a transmitter circuit that provides excitation signals to a terminal of an ultrasonic transducer to drive the ultrasonic transducer during an excitation interval. The excitation signals provided during the excitation interval include a first excitation signal at a first resonant frequency of the ultrasonic transducer followed by a second excitation signal at a second resonant frequency of the ultrasonic transducer. The first resonant frequency is different from the second resonant frequency.

公开(公告)号：US09717426B2

公开(公告)日：2017-08-01

申请号：US14837179

申请日：2015-08-27

Applicant: Texas Instruments Incorporated

Inventor： Ajit Sharma ,  Sriram Narayanan ,  Srinath Mathur Ramaswamy ,  Arup Polley ,  Seung Bae Lee ,  Wen Li

IPC: A61B5/024 ,  A61B5/00

CPC classification number: A61B5/02427 ,  A61B5/6826 ,  A61B5/7228 ,  A61B2562/0238

Abstract: The circuitry of an optical receiver reduces the ambient DC component and the pleth DC component to leave a pleth signal with substantially only a pleth AC component. The circuitry also provides gain control and can provide transmit power control to change the range of the pleth AC component to occupy a desired input range of an analog-to-digital converter.

公开(公告)号：US20170126284A1

公开(公告)日：2017-05-04

申请号：US15397424

申请日：2017-01-03

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Pourya Assem ,  Hun Seok Kim ,  Jing-Fei Ren ,  Srinath Mathur Ramaswamy

IPC: H04B5/00 ,  H04W4/00 ,  H04W4/02 ,  H04B17/318

CPC classification number: H04B5/0043 ,  H04B17/27 ,  H04B17/318 ,  H04W4/023 ,  H04W4/80

Abstract: Methods and apparatus to determine nearfield localization using phase and received signal strength indication (RSSI) diversity are disclosed. An example method includes determining a first strength of an electric field and a second strength of a magnetic field, the electric field and the magnetic field associated with an electromagnetic signal sent from a transmitter; determining a difference between the first strength and the second strength; and determining a transmitter distance based on the difference between the first strength and the second strength.

公开(公告)号：US09571163B1

公开(公告)日：2017-02-14

申请号：US14927747

申请日：2015-10-30

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Pourya Assem ,  Hun Seok Kim ,  Jing-Fei Ren ,  Srinath Mathur Ramaswamy

IPC: H04B7/24 ,  H04B5/00 ,  H04B17/318 ,  H04W4/02

CPC classification number: H04B5/0043 ,  H04B17/27 ,  H04B17/318 ,  H04W4/023 ,  H04W4/80

Abstract: Methods and apparatus to determine nearfield localization using phase and received signal strength indication (RSSI) diversity are disclosed. An example method includes determining a first strength of an electric field and a second strength of a magnetic field, the electric field and the magnetic field associated with an electromagnetic signal sent from a transmitter; determining a difference between the first strength and the second strength; and determining a transmitter distance based on the difference between the first strength and the second strength.

Abstract translation: 公开了使用相位和接收信号强度指示（RSSI）分集来确定近场定位的方法和装置。 示例性方法包括确定电场的第一强度和磁场的第二强度，与从发射机发送的电磁信号相关联的电场和磁场; 确定第一强度和第二强度之间的差; 以及基于所述第一强度和所述第二强度之间的差确定发射机距离。