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US 2021/0333390 A1Published application
Method and system for ultrasound time-of-flight measurement
AssigneeTexas Instruments Incorporated
InventorsYuming Zhu, Srinath Ramaswamy, Domingo Garcia, Sujeet Milind Patole
Life of this patent
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Abstract
A transducer system with transducer and circuitry for applying a pulse train at a single frequency to excite the transducer. The transducer is operable to receive an echo waveform in response to the pulse train. The system also comprises circuitry for determining a time of flight as between a first reference time associated with the pulse train and a second reference time associated with the echo waveform.
Claims18
A method comprising:
- receiving a set of samples associated with an echo waveform;
- determining an amplitude envelope of the echo waveform using the set of samples;
- determining a threshold crossing time based on the amplitude envelope crossing a threshold;
- identifying a subset of the set of samples proximate in time to the threshold crossing time;
- determining a phase of each sample in the subset;
- performing a line fit on the phases of the samples in the subset to determine a zero phase time of the echo waveform proximate to the threshold crossing time;
- and
- determining a time of flight associated with the echo waveform using the zero phase time proximate to the threshold crossing time.
5 more elements
A system comprising:
- an analog-to-digital converter configured to receive an electrical signal associated with an echo waveform and to produce a set of samples associated with the echo waveform in response to the electrical signal;
- and
- a processor coupled to the analog-to-digital converter and configured to:
- receive the set of samples from the analog-to-digital converter;
- determine an amplitude envelope based on the set of samples;
- determine a threshold crossing time for the amplitude envelope;
- identify a subset of the set of samples proximate in time to the threshold crossing time;
- determine a phase of each sample in the subset;
- perform a line fit on the phases of the samples in the subset to determine a zero phase time of the echo waveform proximate to the threshold crossing time;
- and
- determine a time of flight associated with the echo waveform using the zero phase time proximate to the threshold crossing time.
8 more elements
Dependencies are inferred from the claim text.