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公开(公告)号：US20190047019A1
公开(公告)日：2019-02-14
申请号：US15675162
申请日：2017-08-11
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： LEI DING , SRINATH MATHUR RAMASWAMY , BAHER HAROUN
CPC classification number: B06B1/0223 , B05B17/06 , B06B1/0215 , B06B1/0269 , G01F23/22 , G01S7/524 , G01S15/10 , G01S15/102 , G10K11/341
Abstract: An ultrasonic detection circuit includes a transmitter circuit that provides excitation signals to an ultrasonic transducer during an excitation interval. A control circuit includes a port to receive a command. The control circuit controls the frequency and the duty cycle of the excitation signals of the transmitter circuit during the excitation interval. The control circuit generates a first excitation signal sequence of the excitation interval followed by a first monitoring period to receive a first echo signal in response to the command. The control circuit generates a second excitation signal sequence of the excitation interval followed by a second monitoring period to receive a second echo signal in response to the command. The control circuit outputs results via the port based on at least one of the first or second echo signals received.
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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
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.
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公开(公告)号：US20200033462A1
公开(公告)日：2020-01-30
申请号：US16364691
申请日：2019-03-26
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： LEI DING , SRINATH MATHUR RAMASWAMY , VAIBHAV GARG , ANAND GOPALAN
Abstract: In an ultrasonic detection system that uses frequency-modulation coding to distinguish emitted bursts from multiple transducers, a receiver associated with a transducer uses dynamic thresholding to discriminate valid echoes from system and environmental noise in multiple envelope signals produced by multiple correlators. The time-varying dynamic thresholds are generated from the mean of noise in a respective envelope derived from the output of a respective correlator. Multiple thresholds can be combined together such that a single time-varying threshold is applied to all correlators' envelopes. Such thresholding has the benefits of a constant false-alarm rate with regard to detection of echoes (as opposed to false triggering from noise), and, owing to finer-resolution and adaptive thresholds, can detect targets or obstacles as further distances and with greater time responsiveness.
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公开(公告)号：US20180364341A1
公开(公告)日：2018-12-20
申请号：US15626964
申请日：2017-06-19
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： LEI DING , SRINATH MATHUR RAMASWAMY
IPC: G01S7/52
CPC classification number: G01S7/52004 , G01S7/524
Abstract: A circuit includes an ultrasonic transducer having a first terminal and a second terminal. The first terminal receives an electrical drive signal and excites the ultrasonic transducer during an excitation interval to provide an ultrasound signal. The first terminal also provides an electrical receive signal in response to the ultrasonic transducer receiving a reflected ultrasound signal. The circuit includes a capacitor having one terminal connected to the first terminal of the ultrasonic transducer. A resistor is connected to another terminal of the capacitor to form a resistor-capacitor (RC) network. At least one of resistor and the capacitor have a variable resistance or capacitance value that is set to tune the RC network to mitigate ringing of the ultrasonic transducer following the excitation interval.
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公开(公告)号：US20220065900A1
公开(公告)日：2022-03-03
申请号：US17463112
申请日：2021-08-31
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： LEI DING , SRINATH MATHUR RAMASWAMY , DOK WON LEE , BAHER HAROUN , WAI LEE , STEVEN JOHN LOVELESS
Abstract: In a described example, a circuit includes a sensor circuit including multiple magnetic field sensors having respective sensor outputs. The magnetic field sensors are configured to provide magnetic field sensor signals at the respective sensor outputs representative of a measure of current flow through a conductive structure. A combiner interface has combiner inputs and a combiner output. The combiner inputs are coupled to the respective sensor outputs. The combiner interface is configured to provide an aggregate sensor measurement at the combiner output responsive to the magnetic field sensor signals, in which the aggregate sensor measurement is decoupled from magnetic fields generated responsive to the current flow through the conductive structure.
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Patent Agency Ranking
公开(公告)号：US20190339386A1
公开(公告)日：2019-11-07
申请号：US16364652
申请日：2019-03-26
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： LEI DING , SRINATH MATHUR RAMASWAMY , ANAND GOPALAN , VAIBHAV GARG , ANAND GANESH DABAK , BAHER S. HAROUN
Abstract: In an ultrasonic detection system that uses frequency-modulation or phase-modulation coding to distinguish emitted bursts from multiple transducers, a receiver associated with a transducer uses peak search, peak buffer, and peak rank stages in one or more receiver signal processing paths to identify valid received ultrasonic signal envelope peaks in correlator outputs. The peak rank stage can support different modes respectively designed to handle one code, two or more codes, or two or more codes with support for Doppler frequency shift detection. Valid peak information (e.g., amplitude and time) can be reported to a central controller and/or stored locally in a fusion stage to generate more intelligent information for targets or obstacles using peaks from multiple bursts.
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公开(公告)号：US20190033434A1
公开(公告)日：2019-01-31
申请号：US15659919
申请日：2017-07-26
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： LEI DING , SRINATH MATHUR RAMASWAMY
CPC classification number: G01S7/52036 , G01S7/52017 , G01S15/8913 , G01S15/8952
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.
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公开(公告)号：US20240411017A1
公开(公告)日：2024-12-12
申请号：US18393905
申请日：2023-12-22
Applicant: Texas Instruments Incorporated
Inventor： LEI DING , Srinath Mathur Ramaswamy , Anand Gopalan , Vaibhav Garg , Anand Ganesh Dabak
IPC: G01S15/10 , G01S7/526 , G01S15/931
Abstract: In one example, a method comprises using a first transducer, emitting a first acoustic signal representing a first code. The method further comprises using the first transducer, receiving a second acoustic signal, and converting the second acoustic signal to a sensor signal. The method further comprises computing a time-of-flight for the second acoustic signal based on a time difference between when the first transducer emits the first acoustic signal and when the first transducer receives the second acoustic signal. The method further comprises responsive to the correlation result indicating that the third acoustic signal is a reflection of a third acoustic signal emitted by a second transducer: determining a delay time between when the first transducer emits the first acoustic signal and when the second transducer emits the third acoustic signal; adjusting the time-of-flight based on the delay time; and providing a distance measurement based on the adjusted time-of-flight.
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9.发明申请公开(公告)号：US20220035031A1
公开(公告)日：2022-02-03
申请号：US17503407
申请日：2021-10-18
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： LEI DING , SRINATH MATHUR RAMASWAMY , ANAND GOPALAN
Abstract: Ultrasonic ranging systems and methods that emit coded bursts and correlate transduced acoustical echoes of the bursts with a receive template characterizing a burst code to determine time-of-flight information use receive templates of time-variable length to improve short-range object detection. The template length is based on a time index measured from the start of the burst emission. The detection can account for a dead zone of transducer ringing following a burst. A time-variable gain that is also based on the time index can be applied to the correlated signal. The length and gain can be adjusted with reduced temporal frequency to reduce computation cost.
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10.发明申请公开(公告)号：US20210156995A1
公开(公告)日：2021-05-27
申请号：US16694506
申请日：2019-11-25
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： LEI DING , SRINATH MATHUR RAMASWAMY , ANAND GOPALAN
Abstract: Ultrasonic ranging systems and methods that emit coded bursts and correlate transduced acoustical echoes of the bursts with a receive template characterizing a burst code to determine time-of-flight information use receive templates of time-variable length to improve short-range object detection. The template length is based on a time index measured from the start of the burst emission. The detection can account for a dead zone of transducer ringing following a burst. A time-variable gain that is also based on the time index can be applied to the correlated signal. The length and gain can be adjusted with reduced temporal frequency to reduce computation cost.
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