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公开(公告)号：US20170356937A1
公开(公告)日：2017-12-14
申请号：US15180814
申请日：2016-06-13
Applicant: FREESCALE SEMICONDUCTOR, INC.
Inventor： Lukas Vaculik , Jan Tomecek
CPC classification number: G01R19/2506 , G01R13/0272 , G01R13/34 , G01R13/345 , G01R19/0053 , G01R23/02 , H03M1/0656 , H03M1/12 , H03M1/1255
Abstract: A method, apparatus, and energy metering system obtains mains samples of a mains power line signal, performs non-white noise (NWN) filtering of the mains power line signal, obtains adjustable clock source samples of an adjustable clock signal of an adjustable clock oscillator, determines a difference based on the mains samples and the adjustable clock source samples, adjusts an adjustable clock source frequency of the adjustable clock oscillator based on the difference, and applies the adjustable clock source frequency to an analog to digital converter (ADC) to determine a conversion rate of the ADC.
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公开(公告)号：US20160370894A1
公开(公告)日：2016-12-22
申请号：US14744310
申请日：2015-06-19
Applicant: Freescale Semiconductor, Inc.
Inventor： Karel Povalac , Petr Gargulak , Lukas Vaculik
IPC: G06F3/044 , G06F3/0354 , G06F3/041
CPC classification number: G06F3/044 , G06F3/03545 , G06F3/03547 , G06F3/0416 , G06F3/0418 , G06F2203/04106 , G06F2203/04808
Abstract: A signal adaptive filtering technique for recognizing touch and release events as indicated from a measured capacitance signal received from a capacitive touch sensor device in order to improve electromagnetic noise immunity, event detection responses, adaptability to dynamically changing environments, and adaptability to signal sensitivity changes and signal offset over an extended period of time. A capacitive touch sensor system may include one or more capacitive touch sensor devices, each sending a measured capacitance signal that outputs a baseline capacitance signal during a release event, and outputs an increased capacitance signal during a touch event. The system updates the baseline capacitance signal with a filter, wherein a transfer function of the filter varies as a function of a current state of the capacitive touch sensor device, determines a range of capacitance values calculated from the baseline capacitance signal in which a recognition of the touch event will not be performed, creates a predicted signal from a filtered version of the measured capacitance signal, and recognizes a touch or release event from a comparison of the measured capacitance signal to the predicted signal.
Abstract translation: 一种用于识别从电容式触摸传感器装置接收的测量电容信号所指示的触摸和释放事件的信号自适应滤波技术，以便改善电磁噪声抗扰度，事件检测响应，对动态变化环境的适应性以及对信号灵敏度变化的适应性，以及 信号偏移在一段延长的时间内。 电容式触摸传感器系统可以包括一个或多个电容式触摸传感器装置，每个电容式触摸传感器装置发送测量的电容信号，其在释放事件期间输出基线电容信号，并且在触摸事件期间输出增加的电容信号。 系统利用滤波器更新基线电容信号，其中滤波器的传递函数作为电容式触摸传感器装置的当前状态的函数而变化，确定从基线电容信号计算的电容值的范围，其中识别 将不执行触摸事件，从测量的电容信号的滤波版本创建预测信号，并且从测量的电容信号与预测信号的比较中识别触摸或释放事件。
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公开(公告)号：US09811220B2
公开(公告)日：2017-11-07
申请号：US14744310
申请日：2015-06-19
Applicant: Freescale Semiconductor, Inc.
Inventor： Karel Povalac , Petr Gargulak , Lukas Vaculik
IPC: G06F3/044 , G06F3/041 , G06F3/0354
CPC classification number: G06F3/044 , G06F3/03545 , G06F3/03547 , G06F3/0416 , G06F3/0418 , G06F2203/04106 , G06F2203/04808
Abstract: A signal adaptive filtering technique for recognizing touch and release events as indicated from a measured capacitance signal received from a capacitive touch sensor device in order to improve electromagnetic noise immunity, event detection responses, adaptability to dynamically changing environments, and adaptability to signal sensitivity changes and signal offset over an extended period of time. A capacitive touch sensor system may include one or more capacitive touch sensor devices, each sending a measured capacitance signal that outputs a baseline capacitance signal during a release event, and outputs an increased capacitance signal during a touch event. The system updates the baseline capacitance signal with a filter, wherein a transfer function of the filter varies as a function of a current state of the capacitive touch sensor device, determines a range of capacitance values calculated from the baseline capacitance signal in which a recognition of the touch event will not be performed, creates a predicted signal from a filtered version of the measured capacitance signal, and recognizes a touch or release event from a comparison of the measured capacitance signal to the predicted signal.
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公开(公告)号：US09841446B1
公开(公告)日：2017-12-12
申请号：US15180814
申请日：2016-06-13
Applicant: FREESCALE SEMICONDUCTOR, INC.
Inventor： Lukas Vaculik , Jan Tomecek
CPC classification number: G01R19/2506 , G01R13/0272 , G01R13/34 , G01R13/345 , G01R19/0053 , G01R23/02 , H03M1/0656 , H03M1/12 , H03M1/1255
Abstract: A method, apparatus, and energy metering system obtains mains samples of a mains power line signal, performs non-white noise (NWN) filtering of the mains power line signal, obtains adjustable clock source samples of an adjustable clock signal of an adjustable clock oscillator, determines a difference based on the mains samples and the adjustable clock source samples, adjusts an adjustable clock source frequency of the adjustable clock oscillator based on the difference, and applies the adjustable clock source frequency to an analog to digital converter (ADC) to determine a conversion rate of the ADC.
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