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1. 发明申请

US20110250931A1 Static Heading Detection in Personal Navigation Device 审中-公开
标题翻译：个人导航设备中的静态标题检测
公开(公告)号：US20110250931A1
公开(公告)日：2011-10-13
申请号：US13078748
申请日：2011-04-01
申请人： Tarkesh Pande , Jaiganesh Balakrishnan , Deric Waters , Goutam Dutta , Jayawardan Janardhanan , Sthanunathan Ramakrishnan , Sandeep Rao , Karthik Ramasubramanian
发明人： Tarkesh Pande , Jaiganesh Balakrishnan , Deric Waters , Goutam Dutta , Jayawardan Janardhanan , Sthanunathan Ramakrishnan , Sandeep Rao , Karthik Ramasubramanian
IPC分类号： G01C21/00 , G01S1/08 , H04W88/02 , G01S1/02
CPC分类号： G01S19/47 , G01C21/165
摘要： A personal navigation device configured to determine heading readings continuously using data from a sensor in the personal navigation device. Heading readings are selected corresponding to a periodic event. A representative heading is determined from the selected heading readings. When a portion of the selected heading readings has a value within a range of the representative heading, a static heading indicator is asserted to indicate the personal navigation device is moving in a static heading. The static heading indicator may be used to smooth an estimated trajectory of the personal navigation device.
摘要翻译：一种个人导航装置，被配置为使用来自个人导航装置中的传感器的数据连续地确定航向读数。根据周期性事件选择标题读数。从所选标题读数确定代表性标题。当所选航标读数的一部分具有在代表性标题的范围内的值时，断言静态航向指示符以指示个人导航设备正在静态航向中移动。静态航向指示符可以用于平滑个人导航设备的估计轨迹。

2. 发明授权

US08930136B2 Static heading detection in personal navigation device 有权
标题翻译：个人导航设备中的静态航向检测
公开(公告)号：US08930136B2
公开(公告)日：2015-01-06
申请号：US13078748
申请日：2011-04-01
申请人： Tarkesh Pande , Jaiganesh Balakrishnan , Deric Waters , Goutam Dutta , Jayawardan Janardhanan , Sthanunathan Ramakrishnan , Sandeep Rao , Karthik Ramasubramanian
发明人： Tarkesh Pande , Jaiganesh Balakrishnan , Deric Waters , Goutam Dutta , Jayawardan Janardhanan , Sthanunathan Ramakrishnan , Sandeep Rao , Karthik Ramasubramanian
IPC分类号： G01C21/10 , G01C22/00 , G01S19/47 , G01C21/16
CPC分类号： G01S19/47 , G01C21/165
摘要： A personal navigation device configured to determine heading readings continuously using data from a sensor in the personal navigation device. Heading readings are selected corresponding to a periodic event. A representative heading is determined from the selected heading readings. When a portion of the selected heading readings has a value within a range of the representative heading, a static heading indicator is asserted to indicate the personal navigation device is moving in a static heading. The static heading indicator may be used to smooth an estimated trajectory of the personal navigation device.
摘要翻译：一种个人导航装置，被配置为使用来自个人导航装置中的传感器的数据连续地确定航向读数。根据周期性事件选择标题读数。从所选标题读数确定代表性标题。当所选航标读数的一部分具有在代表性标题的范围内的值时，断言静态航向指示符以指示个人导航设备正在静态航向中移动。静态航向指示符可以用于平滑个人导航设备的估计轨迹。

3. 发明授权

US10330491B2 Robust step detection using low cost MEMS accelerometer in mobile applications, and processing methods, apparatus and systems 有权
公开(公告)号：US10330491B2
公开(公告)日：2019-06-25
申请号：US13302329
申请日：2011-11-22
申请人： Jayawardan Janardhanan , Sandeep Rao , Goutam Dutta
发明人： Jayawardan Janardhanan , Sandeep Rao , Goutam Dutta
IPC分类号： G06F19/00 , G01P21/00 , G01C22/00 , G01C21/18 , G06F1/16 , G01C21/16 , G01C21/20 , G01P15/00 , G01F15/00
摘要： A system (10) for pedestrian use includes an accelerometer (110) having multiple electronic sensors; an electronic circuit (100) operable to generate a signal stream representing magnitude of overall acceleration sensed by the accelerometer (110), and to electronically correlate a sliding window (520) of the signal stream with itself to produce peaks at least some of which represent walking steps, and further operable to electronically execute a periodicity check (540) to compare different step periods for similarity, and if sufficiently similar then to update (560) a portion of the circuit substantially representing a walking-step count; and an electronic display (190) responsive to the electronic circuit (100) to display information at least in part based on the step count. Other systems, electronic circuits and processes are disclosed.

4. 发明申请

US20130090881A1 ROBUST STEP DETECTION USING LOW COST MEMS ACCELEROMETER IN MOBILE APPLICATIONS, AND PROCESSING METHODS, APPARATUS AND SYSTEMS 审中-公开
标题翻译：在移动应用中使用低成本MEMS加速度计的鲁棒步进检测和处理方法，装置和系统
公开(公告)号：US20130090881A1
公开(公告)日：2013-04-11
申请号：US13302329
申请日：2011-11-22
申请人： Jayawardan Janardhanan , Sandeep Rao , Goutam Dutta
发明人： Jayawardan Janardhanan , Sandeep Rao , Goutam Dutta
IPC分类号： G06F19/00 , G01P21/00
CPC分类号： G01C22/006 , G01C21/16 , G01C21/165 , G01C21/18 , G01C21/206 , G01F15/00 , G01P15/00 , G06F1/163
摘要： A system (10) for pedestrian use includes an accelerometer (110) having multiple electronic sensors; an electronic circuit (100) operable to generate a signal stream representing magnitude of overall acceleration sensed by the accelerometer (110), and to electronically correlate a sliding window (520) of the signal stream with itself to produce peaks at least some of which represent walking steps, and further operable to electronically execute a periodicity check (540) to compare different step periods for similarity, and if sufficiently similar then to update (560) a portion of the circuit substantially representing a walking-step count; and an electronic display (190) responsive to the electronic circuit (100) to display information at least in part based on the step count. Other systems, electronic circuits and processes are disclosed.
摘要翻译：一种用于行人使用的系统（10）包括具有多个电子传感器的加速度计（110）电子电路（100），其可操作以产生表示由所述加速度计（110）感测的总加速度的大小的信号流，并且将所述信号流的滑动窗口（520）与其自身电子相关，以产生峰值，其中至少一些代表并且进一步可操作以电子地执行周期性检查（540）以比较用于相似性的不同步骤周期，并且如果足够类似以更新（560）基本上表示步行步数的电路的一部分; 以及响应于所述电子电路（100）至少部分地基于所述步数显示信息的电子显示器（190）。公开了其他系统，电子电路和过程。

5. 发明申请

US20090252269A1 DIGITAL RADIO PROCESSOR ARCHITECTURE WITH REDUCED DCO MODULATION RANGE REQUIREMENT 有权
标题翻译：具有减少DCO调制范围要求的数字无线电处理器架构
公开(公告)号：US20090252269A1
公开(公告)日：2009-10-08
申请号：US12060886
申请日：2008-04-02
申请人： Sarma S. Gunturi , Jawaharlal Tangudu , Sthanunathan Ramakrishnan , Jayawardan Janardhanan , Debapriya Sahu , Subhashish Mukherjee
发明人： Sarma S. Gunturi , Jawaharlal Tangudu , Sthanunathan Ramakrishnan , Jayawardan Janardhanan , Debapriya Sahu , Subhashish Mukherjee
IPC分类号： H04L7/00
CPC分类号： H04L27/362 , H04L7/0331
摘要： A method of achieving reduced modulation range requirement in a Digitally Controlled Oscillator (DCO) which is deployed as part of a DRP (Digital Radio Processor) and tuned to a tuning frequency range having operating-channel center-frequencies, wherein phase difference between consecutive samples is termed as FCW (Frequency Control Word), uses the steps of digitally modifying and limiting the FCW so that the FCW does not exceed known FCW thresholds, e.g., chosen from π/2, π/4, π/8, and redistributing the FCWs while maintaining a cumulative sum of phases and without significant EVM (Error Vector Magnitude) degradation. The FCW threshold can be chosen arbitrarily and need not be in the form of π/2n. The method uses a FCW limiting algorithm which reduces supply voltage sensitivity of the DCO and enables significant reduction in area of capacitor bank which would be otherwise needed.
摘要翻译：一种在数字控制振荡器（DCO）中实现减少的调制范围要求的方法，其被部署为DRP（数字无线电处理器）的一部分并被调谐到具有操作信道中心频率的调谐频率范围，其中连续样本之间的相位差被称为FCW（频率控制字），使用数字修改和限制FCW的步骤，使得FCW不超过已知的FCW阈值，例如从pi / 2，pi / 4，pi / 8选择并重新分配 FCW同时保持相位的累积和，并且没有显着的EVM（误差矢量幅度）劣化。 FCW阈值可以任意选择，不需要以pi / 2n的形式。该方法使用FCW限制算法，其降低DCO的电源电压灵敏度，并且能够显着减小电容器组的面积，否则将需要它。

6. 发明授权

US08694251B2 Attitude estimation for pedestrian navigation using low cost mems accelerometer in mobile applications, and processing methods, apparatus and systems 有权
标题翻译：在移动应用中使用低成本mems加速度计的行人导航姿态估计，以及处理方法，装置和系统
公开(公告)号：US08694251B2
公开(公告)日：2014-04-08
申请号：US13301913
申请日：2011-11-22
申请人： Jayawardan Janardhanan , Goutam Dutta , Varun Tripuraneni
发明人： Jayawardan Janardhanan , Goutam Dutta , Varun Tripuraneni
IPC分类号： G01C21/10
CPC分类号： G01C21/16 , G01C21/165 , G01C21/20 , G01C22/006
摘要： A user-heading determining system (10) for pedestrian use includes a multiple-axis accelerometer (110) having acceleration sensors; a device-heading sensor circuit (115) physically situated in a fixed relationship to the accelerometer (110); an electronic circuit (100) operable to generate signals representing components of acceleration sensed by the accelerometer (110) sensors, and to electronically process at least some part of the signals to produce an estimation of attitude of a user motion with respect to the accelerometer, and further to combine the attitude estimation (750, α) with a device heading estimation (770, ψ) responsive to the device-heading sensor circuit, to produce a user heading estimation (780); and an electronic display (190) responsive to the electronic circuit (100) to display information at least in part based on the user heading estimation. Other systems, circuits and processes are also disclosed.
摘要翻译：用于行人使用的用户航向确定系统（10）包括具有加速度传感器的多轴加速度计（110）物理地位于与所述加速度计（110）固定关系的设备航向传感器电路（115）; 电子电路（100），其可操作以产生表示由所述加速度计（110）传感器感测到的加速度的分量的信号，并且电子处理所述信号的至少一部分以产生相对于所述加速度计的用户运动姿态的估计，并且进一步将所述姿态估计（750，α）与响应于所述设备航向传感器电路的设备航向估计（770，ψ）组合以产生用户航向估计（780）; 以及响应于所述电子电路（100）至少部分地基于所述用户标题估计来显示信息的电子显示器（190）。还公开了其它系统，电路和过程。

7. 发明授权

US08345811B2 Digital radio processor architecture with reduced DCO modulation range requirement 有权
标题翻译：数字无线电处理器架构具有降低的DCO调制范围要求
公开(公告)号：US08345811B2
公开(公告)日：2013-01-01
申请号：US12060886
申请日：2008-04-02
申请人： Sarma S. Gunturi , Jawaharlal Tangudu , Sthanunathan Ramakrishnan , Jayawardan Janardhanan , Debapriya Sahu , Subhashish Mukherjee
发明人： Sarma S. Gunturi , Jawaharlal Tangudu , Sthanunathan Ramakrishnan , Jayawardan Janardhanan , Debapriya Sahu , Subhashish Mukherjee
IPC分类号： H04L7/00
CPC分类号： H04L27/362 , H04L7/0331
摘要： A method of achieving reduced modulation range requirement in a Digitally Controlled Oscillator (DCO) which is deployed as part of a DRP (Digital Radio Processor) and tuned to a tuning frequency range having operating-channel center-frequencies, wherein phase difference between consecutive samples is termed as FCW (Frequency Control Word), uses the steps of digitally modifying and limiting the FCW so that the FCW does not exceed known FCW thresholds, e.g., chosen from π/2, π/4, π/8, and redistributing the FCWs while maintaining a cumulative sum of phases and without significant EVM (Error Vector Magnitude) degradation. The FCW threshold can be chosen arbitrarily and need not be in the form of π/2n. The method uses a FCW limiting algorithm which reduces supply voltage sensitivity of the DCO and enables significant reduction in area of capacitor bank which would be otherwise needed.
摘要翻译：一种在数字控制振荡器（DCO）中实现减少的调制范围要求的方法，其被部署为DRP（数字无线电处理器）的一部分并被调谐到具有操作信道中心频率的调谐频率范围，其中连续样本之间的相位差被称为FCW（频率控制字），使用数字修改和限制FCW的步骤，使得FCW不超过已知的FCW阈值，例如从＆pgr; / 2，＆pgr; / 4，＆pgr / 并重新分配FCW，同时保持相位的累积和，并且没有显着的EVM（误差向量幅度）劣化。 FCW阈值可以任意选择，不需要以＆pgr / 2n的形式。该方法使用FCW限制算法，其降低DCO的电源电压灵敏度，并且能够显着减小电容器组的面积，否则将需要它。

8. 发明申请

US20120136573A1 ATTITUDE ESTIMATION FOR PEDESTRIAN NAVIGATION USING LOW COST MEMS ACCELEROMETER IN MOBILE APPLICATIONS, AND PROCESSING METHODS, APPARATUS AND SYSTEMS 有权
标题翻译：在移动应用中使用低成本MEMS加速度计的PEDESTRIAN导航的姿态估计和处理方法，装置和系统
公开(公告)号：US20120136573A1
公开(公告)日：2012-05-31
申请号：US13301913
申请日：2011-11-22
申请人： Jayawardan Janardhanan , Goutam Dutta , Varun Tripuraneni
发明人： Jayawardan Janardhanan , Goutam Dutta , Varun Tripuraneni
IPC分类号： G01C21/16
CPC分类号： G01C21/16 , G01C21/165 , G01C21/20 , G01C22/006
摘要： A user-heading determining system (10) for pedestrian use includes a multiple-axis accelerometer (110) having acceleration sensors; a device-heading sensor circuit (115) physically situated in a fixed relationship to the accelerometer (110); an electronic circuit (100) operable to generate signals representing components of acceleration sensed by the accelerometer (110) sensors, and to electronically process at least some part of the signals to produce an estimation of attitude of a user motion with respect to the accelerometer, and further to combine the attitude estimation (750, α) with a device heading estimation (770, ψ) responsive to the device-heading sensor circuit, to produce a user heading estimation (780); and an electronic display (190) responsive to the electronic circuit (100) to display information at least in part based on the user heading estimation. Other systems, circuits and processes are also disclosed.
摘要翻译：用于行人使用的用户航向确定系统（10）包括具有加速度传感器的多轴加速度计（110）物理地位于与所述加速度计（110）固定关系的设备航向传感器电路（115）; 电子电路（100），其可操作以产生表示由所述加速度计（110）传感器感测到的加速度的分量的信号，并且电子处理所述信号的至少一部分以产生相对于所述加速度计的用户运动姿态的估计，并且进一步将所述姿态估计（750，α）与响应于所述设备航向传感器电路的设备航向估计（770，ψ）组合以产生用户航向估计（780）; 以及响应于所述电子电路（100）至少部分地基于所述用户标题估计来显示信息的电子显示器（190）。还公开了其它系统，电路和过程。

9. 发明授权

US08400340B2 Achieving high dynamic range in a sigma delta analog to digital converter 有权
标题翻译：在Σ-Δ模数转换器中实现高动态范围
公开(公告)号：US08400340B2
公开(公告)日：2013-03-19
申请号：US13184570
申请日：2011-07-18
申请人： Vineet Mishra , Jayawardan Janardhanan , Samala Sreekiran , Meghna Agrawal
发明人： Vineet Mishra , Jayawardan Janardhanan , Samala Sreekiran , Meghna Agrawal
IPC分类号： H03M3/00
CPC分类号： H03M3/496 , H03M3/39 , H03M3/464
摘要： A continuous-time sigma-delta analog to digital converter (CTSD ADC) includes a comparator that samples the time integral of an analog signal at each rising edge and falling edge of a sampling clock. A feedback block, operating as a digital to analog converter, receives the outputs of the comparator and generates corresponding analog signals also at each rising and falling edge of the sampling clock. The feedback blocks are implemented as either switched-resistor or switched-current circuits. High signal-to-noise ratio (SNR) is achieved in the CTSD ADC without the need to use very high sampling clock frequencies. Compensation for excess loop delay is provided using a local feedback technique. In an embodiment, the sigma delta modulator in the CTSD ADC is implemented as a second order loop, and the comparator as a two-level comparator.
摘要翻译：连续时间Σ-Δ模数转换器（CTSD ADC）包括在采样时钟的每个上升沿和下降沿采样模拟信号的时间积分的比较器。作为数模转换器工作的反馈块接收比较器的输出，并在采样时钟的每个上升沿和下降沿也产生相应的模拟信号。反馈块实现为开关电阻或开关电流电路。在CTSD ADC中实现了高信噪比（SNR），而不需要使用非常高的采样时钟频率。使用本地反馈技术提供多余回路延迟的补偿。在一个实施例中，CTSD ADC中的Σ-Δ调制器被实现为二阶环路，比较器被实现为两电平比较器。

10. 发明授权

US07006115B2 Supporting variable line length in digital display timing controllers using data enable signal 有权
公开(公告)号：US07006115B2
公开(公告)日：2006-02-28
申请号：US10176663
申请日：2002-06-24
申请人： Jayawardan Janardhanan , Deepak Khanchandani , Ramanujam Thodur Madabusi
发明人： Jayawardan Janardhanan , Deepak Khanchandani , Ramanujam Thodur Madabusi
IPC分类号： G09G5/02
CPC分类号： G09G5/006 , G09G5/18
摘要： A digital display unit which receives horizontal lines of unequal length in a V-active region and computes an average length of the lines. The average is used to generate horizontal line demarkers in the V-blank (vertical blank) region. The demarkers specify the transition from one line to the other. Such a feature is useful in spread spectrum clocking (SSC) based display signals in which HSYNC signals may also not be available to determine the transitions from one line to another in the V-blank region.

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