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US 12,730,218 B2Granted
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.
Claims26
A method comprising:
- receiving a set of non-zero samples associated with multiple cycles of a signal, in which multiple non-zero samples are received for each cycle of the signal;
- determining a threshold crossing time based on an amplitude envelope of the signal crossing a threshold;
- determining a zero phase time of a zero crossing of the signal based on the threshold crossing time and phases of at least a subset of the set of samples and times of the phases;
- and
- determining a time of flight associated with the signal based on the zero phase time.
2 more elements
A system comprising:
- an analog-to-digital converter configurable to receive a signal, sample the signal at a sampling rate higher than a frequency of the signal, and generate a set of non-zero samples of the signal, in which multiple samples are generated for each cycle of the signal;
- and
- a processor coupled to the analog-to-digital converter and configured to:
- determine a threshold crossing time based on an amplitude envelope of the signal crossing a threshold;
- determine a zero phase time of a zero crossing of the signal based on the threshold crossing time and phases of at least a subset of the set of samples and times of the phases;
- and
- determine a time of flight associated with the signal based on the zero phase time.
4 more elements
Dependencies are inferred from the claim text.