公开(公告)号：US10801868B2

公开(公告)日：2020-10-13

申请号：US14300303

申请日：2014-06-10

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Anand Dabak ,  Venkata Ramanan

IPC: G01F1/66 ,  G06F17/15

Abstract: A method of calculating a time difference is disclosed. The method includes sampling a first ultrasonic signal (r21) to produce a first sampled signal (y1(i)) and sampling a second ultrasonic signal (r12) to produce a second sampled signal (y2(i)). A first time (LEAD_LAG) is determined between a time the first sampled signal crosses a threshold (θ1) and a time the second sampled signal crosses the threshold. The first sampled signal is cross correlated with the second sampled signal to produce a second time (SAMP_OFFSET). The time difference is calculated in response to the first and second times.

公开(公告)号：US20140107950A1

公开(公告)日：2014-04-17

申请号：US14051623

申请日：2013-10-11

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Anand Dabak ,  Venkata Ramanan

IPC: G01F1/66

CPC classification number: G01F1/66 ,  G01F1/667

Abstract: A method of calculating a time difference is disclosed. The method includes receiving a first ultrasonic signal (r21) having a first frequency from a first transducer (UT2) at a first time and receiving a second ultrasonic signal (r12) having the first frequency from a second ultrasonic transducer (UT2) at a second time. The first ultrasonic signal and the second ultrasonic signal are sampled at a second frequency (302). The first sampled ultrasonic frequency is interpolated (306). The difference in travel time between the first and second ultrasonic signals is calculated in response to the interpolated first sampled ultrasonic signal and the sampled second ultrasonic signal (equation [43]).

Abstract translation: 公开了一种计算时差的方法。 该方法包括在第一时间从第一换能器（UT2）接收具有第一频率的第一超声信号（r21），并在第二时间从第二超声换能器（UT2）接收具有第一频率的第二超声信号（r12） 时间。 以第二频率（302）对第一超声信号和第二超声信号进行采样。 第一采样超声波频率被内插（306）。 响应于内插的第一采样超声信号和采样的第二超声信号（等式[43]）计算第一和第二超声信号之间的行进时间差。