公开(公告)号：US10376243B2

公开(公告)日：2019-08-13

申请号：US14497295

申请日：2014-09-25

Applicant: Texas Instruments Incorporated

Inventor： Sourabh Ravindran ,  Jonathon David Spaulding

IPC: A61B8/00 ,  A61B8/02 ,  A61B8/08

Abstract: A method for ultrasound based heart rate detection in a heart rate monitoring system is provided that includes receiving a demodulated Doppler ultrasound signal, applying a bandpass filter to the demodulated Doppler ultrasound signal to remove a direct current (DC) component and out-of-band noise, wherein a filtered demodulated Doppler ultrasound signal is generated, rectifying the filtered demodulated Doppler ultrasound signal to generate a rectified filtered demodulated Doppler ultrasound signal, applying a low-pass filter to the rectified filtered demodulated Doppler ultrasound signal to filter out undesired components to leave a resulting signal corresponding to power shift due to heart rate, detecting peaks in the resulting signal, and computing a heart rate based on the detected peaks.

公开(公告)号：US20180103855A1

公开(公告)日：2018-04-19

申请号：US15804937

申请日：2017-11-06

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Steven T. Dunbar ,  Sourabh Ravindran

IPC: A61B5/0245 ,  A61B5/00

CPC classification number: A61B5/0245 ,  A61B5/7203 ,  A61B5/7221 ,  A61B5/7246

Abstract: A method and apparatus for monitoring heart rate. The method includes receiving a digital heart monitoring signal, determining the integrity of said signal with a “hand detect” signal that confirms electrical connection to the subject, dividing the digital heart monitoring signal into at least one frame, generating a folded correlation value for the center sample in the at least one frame, identify the number of peaks folded correlation values based on amplitude and distance parameters of the digital heart monitoring signal in the at least one frame, removing false peaks and collecting peaks corresponding to a length of time, determining the heart rate based on the identified peaks wherein the identified peaks relate to a minimum distance between valid heart beat peaks based on a heart rate estimate, computing the weighted average of heart rate value based on the number of previous heart rate values.

公开(公告)号：US09880046B2

公开(公告)日：2018-01-30

申请号：US14712658

申请日：2015-05-14

Applicant: Texas Instruments Incorporated

Inventor： Amardeep Sathyanarayana ,  Nitish Murthy ,  Sourabh Ravindran ,  Brian Paul Burk

IPC: G01H1/00 ,  G01H13/00 ,  G01H3/08

CPC classification number: G01H3/08 ,  G01H1/00 ,  G01H13/00

Abstract: A method and apparatus for determining properties of at least one of a surface or materials adjacent to a portable device. The method includes windowing a segment of the received signal to remove an edge transients, computing the FFT power spectral density of the signal, determining a peak in the spectral energy at a frequency, finding local peaks by determining the difference in the signal amplitude is relation to a pre-determined threshold, and computing harmonic energy according to the local peaks and the difference and determining at least one property of the surface or material.

公开(公告)号：US20150196213A1

公开(公告)日：2015-07-16

申请号：US14667160

申请日：2015-03-24

Applicant: Texas Instruments Incorporated

Inventor： Keya R. Pandia ,  Sourabh Ravindran ,  Edwin Randolph Cole

IPC: A61B5/04

CPC classification number: A61B5/04017 ,  A61B5/029 ,  A61B5/0402 ,  A61B5/1102 ,  A61B5/113 ,  A61B5/6831 ,  A61B5/7207 ,  A61B5/725 ,  A61B5/7278 ,  A61B7/008 ,  A61B2505/07 ,  A61B2560/0475 ,  A61B2562/0219 ,  A61B2562/028

Abstract: A heart monitor includes a single chest accelerometer (210), an analog signal conditioning and sampling section (215) responsive to said accelerometer to produce a digital signal substantially representing acceleration, and a digital processor (220) operable to filter the acceleration signal into a signal affected by body motion and to cancel the body motion signal from the acceleration signal, thereby to produce an acceleration-based cardiac-related signal. Other processes and electronic systems are also disclosed.

Abstract translation: 心脏监视器包括单个胸部加速度计（210），响应于所述加速度计的模拟信号调节和采样部分（215）以产生基本上表示加速度的数字信号;以及数字处理器（220），其可操作以将加速度信号滤波为 信号受体动作影响，并从加速度信号中取消体动信号，从而产生基于加速度的心脏相关信号。 还公开了其它工艺和电子系统。