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1.发明申请公开(公告)号：US20150094592A1
公开(公告)日：2015-04-02
申请号：US14497295
申请日：2014-09-25
Applicant: Texas Instruments Incorporated
Inventor： Sourabh Ravindran , Jonathon David Spaulding
CPC classification number: A61B8/5223 , A61B8/02 , A61B8/462 , A61B8/488 , A61B8/5207
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.
Abstract translation: 提供了一种心率监测系统中基于超声波心率检测的方法，包括接收解调的多普勒超声信号，将带通滤波器应用于解调的多普勒超声信号以去除直流（DC）分量和带外 噪声，其中产生经滤波的解调多普勒超声信号，整流滤波的解调多普勒超声信号以产生经整流的滤波解调多普勒超声信号，对经整流滤波的解调多普勒超声信号应用低通滤波器以滤除不期望的分量以离开 对应于由心率引起的功率偏移的结果信号，检测所得信号中的峰值，以及基于检测到的峰值计算心率。
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公开(公告)号：US20130191069A1
公开(公告)日：2013-07-25
申请号：US13745714
申请日：2013-01-18
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Sourabh Ravindran
CPC classification number: G01C22/006 , G06F1/163 , G06F1/1694
Abstract: A pedometer with a three-axis accelerometer provides reliable step counts while worn on the wrist. Three-axis accelerometer data is combined into a single combined data stream. Each positive slope region around an inflection point in the combined data stream that has positive slope, a magnitude that exceeds an amplitude threshold value and that spans a time period that exceeds a time threshold value is identified. Each negative slope region around an inflection point in the combined data stream that has negative slope, a magnitude that exceeds an amplitude threshold value and that spans a time period that exceeds a time threshold value is identified. A step count is incremented for each occurrence of an identified positive slope region that is separated by an identified negative slope region as a step.
Abstract translation: 带有三轴加速度计的计步器在佩戴在手腕上时可提供可靠的步数。 三轴加速度计数据组合成单个组合数据流。 识别具有正斜率的组合数据流中的拐点周围的每个正斜率区域，超过振幅阈值并跨越超过时间阈值的时间段的幅度。 识别具有负斜率的组合数据流中的拐点周围的每个负斜率区域，超过振幅阈值并跨越超过时间阈值的时间段的幅度。 对于由识别的负斜率区域分隔的所识别的正斜率区域的每次出现，步长计数递增。
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公开(公告)号：US11054279B2
公开(公告)日：2021-07-06
申请号：US13745714
申请日：2013-01-18
Applicant: Texas Instruments Incorporated
Inventor： Sourabh Ravindran
Abstract: A pedometer with a three-axis accelerometer provides reliable step counts while worn on the wrist. Three-axis accelerometer data is combined into a single combined data stream. Each positive slope region around an inflection point in the combined data stream that has positive slope, a magnitude that exceeds an amplitude threshold value and that spans a time period that exceeds a time threshold value is identified. Each negative slope region around an inflection point in the combined data stream that has negative slope, a magnitude that exceeds an amplitude threshold value and that spans a time period that exceeds a time threshold value is identified. A step count is incremented for each occurrence of an identified positive slope region that is separated by an identified negative slope region as a step.
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公开(公告)号：US10945617B2
公开(公告)日：2021-03-16
申请号：US15634521
申请日：2017-06-27
Applicant: Texas Instruments Incorporated
Inventor： Vitali Loseu , Sourabh Ravindran
Abstract: Methods for heart rate measurement based on pulse oximetry are provided that can tolerate some degree of relative displacement of a photoplethysmograph (PPG) heart rate monitor device. In some methods, artifact compensation based on a reference signal is performed on the PPG signal data to remove artifacts in the signal that may be caused, for example, by changes in ambient light and/or motion of a person wearing the monitor device. The reference signal used for artifact compensation may be generated using an LED of a complementary wavelength to that of the LED used to generate the PPG signal, or by driving an LED at a lower current than the current applied to generate the PPG signal.
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公开(公告)号：US09717423B2
公开(公告)日：2017-08-01
申请号：US14166527
申请日：2014-01-28
Applicant: Texas Instruments Incorporated
Inventor： Vitali Loseu , Sourabh Ravindran
CPC classification number: A61B5/02416 , A61B5/681 , A61B5/7207 , A61B5/725
Abstract: Methods for heart rate measurement based on pulse oximetry are provided that can tolerate some degree of relative displacement of a photoplethysmograph (PPG) heart rate monitor device. In some methods, artifact compensation based on a reference signal is performed on the PPG signal data to remove artifacts in the signal that may be caused, for example, by changes in ambient light and/or motion of a person wearing the monitor device. The reference signal used for artifact compensation may be generated using an LED of a complementary wavelength to that of the LED used to generate the PPG signal, or by driving an LED at a lower current than the current applied to generate the PPG signal.
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Patent Agency Ranking
6.发明授权Calculating heart rate from acceleration signals containing cardiac activity signals 有权从包含心脏活动信号的加速度信号计算心率公开(公告)号：US09462956B2
公开(公告)日：2016-10-11
申请号：US14667160
申请日：2015-03-24
Applicant: Texas Instruments Incorporated
Inventor： Keya R. Pandia , Sourabh Ravindran , Edwin Randolph Cole
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。
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7.发明申请METHOD, APPARATUS AND SYSTEM FOR PORTABLE DEVICE SURFACE AND MATERIAL ANALYSIS 有权方法，便携式设备表面和材料分析的装置和系统公开(公告)号：US20150330831A1
公开(公告)日：2015-11-19
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: 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.
Abstract translation: 一种用于确定与便携式设备相邻的表面或材料中的至少一个的属性的方法和装置。 该方法包括：对接收到的信号进行加窗以去除边缘瞬变，计算信号的FFT功率谱密度，确定频谱中的频谱能量的峰值，通过确定信号幅度差异来找到局部峰值关系 根据局部峰值和差值计算谐波能量，并确定表面或材料的至少一个性质。
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8.发明申请Low-Complexity Sensor Displacement Tolerant Pulse Oximetry Based Heart Rate Measurement 有权低复杂度传感器位移耐受脉搏血氧饱和度心率测量公开(公告)号：US20140213863A1
公开(公告)日：2014-07-31
申请号：US14166527
申请日：2014-01-28
Applicant: Texas Instruments Incorporated
Inventor： Vitali Loseu , Sourabh Ravindran
IPC: A61B5/024
CPC classification number: A61B5/02416 , A61B5/681 , A61B5/7207 , A61B5/725
Abstract: Methods for heart rate measurement based on pulse oximetry are provided that can tolerate some degree of relative displacement of a photoplethysmograph (PPG) heart rate monitor device. In some methods, artifact compensation based on a reference signal is performed on the PPG signal data to remove artifacts in the signal that may be caused, for example, by changes in ambient light and/or motion of a person wearing the monitor device. The reference signal used for artifact compensation may be generated using an LED of a complementary wavelength to that of the LED used to generate the PPG signal, or by driving an LED at a lower current than the current applied to generate the PPG signal.
Abstract translation: 提供了基于脉搏血氧饱和度测量的心率测量方法，其可以容忍光电体积描记器（PPG）心率监测装置的一定程度的相对位移。 在一些方法中，对PPG信号数据执行基于参考信号的伪影补偿，以消除例如通过环境光的变化和/或穿着监视器装置的人的运动引起的信号中的假象。 用于伪影补偿的参考信号可以使用与用于产生PPG信号的LED的互补波长的LED或通过以比施加的电流低的电流驱动LED以产生PPG信号来生成LED。
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公开(公告)号：US10327653B2
公开(公告)日：2019-06-25
申请号：US15804937
申请日：2017-11-06
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Steven T. Dunbar , Sourabh Ravindran
IPC: A61B5/04 , A61B5/0245 , A61B5/00
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.
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10.发明申请公开(公告)号：US20170296075A1
公开(公告)日：2017-10-19
申请号：US15634521
申请日：2017-06-27
Applicant: Texas Instruments Incorporated
Inventor： Vitali Loseu , Sourabh Ravindran
CPC classification number: A61B5/02416 , A61B5/681 , A61B5/7207 , A61B5/725
Abstract: Methods for heart rate measurement based on pulse oximetry are provided that can tolerate some degree of relative displacement of a photoplethysmograph (PPG) heart rate monitor device. In some methods, artifact compensation based on a reference signal is performed on the PPG signal data to remove artifacts in the signal that may be caused, for example, by changes in ambient light and/or motion of a person wearing the monitor device. The reference signal used for artifact compensation may be generated using an LED of a complementary wavelength to that of the LED used to generate the PPG signal, or by driving an LED at a lower current than the current applied to generate the PPG signal.
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