公开(公告)号：EP4040682A1

公开(公告)日：2022-08-10

申请号：EP21155525.5

申请日：2021-02-05

申请人： Imec VZW ,  Katholieke Universiteit Leuven KU Leuven Research & Development ,  Stichting IMEC Nederland

发明人： LIN, Qiuyang ,  SONG, Shuang ,  VAN WEGBERG, Roland ,  VAN HELLEPUTTE, Nick

IPC分类号： H03M1/08 ,  H03M1/52 ,  H03M1/54 ,  H03M1/12 ,  H03M1/06

摘要： An analog-to-digital converter, ADC, circuitry, comprises: an integrator (102; 202) connected to a capacitor (110; 210a, 210b), the integrator (102; 202) being configured to switch between integrating an analog input signal for ramping an integrator output and integrating a reference input signal for returning integrator output towards a threshold; a comparator (120; 220) for comparing integrator output to the threshold; and a timer (150; 250) for determining a time duration during which the reference input signal is integrated, the time duration providing a digital representation of an analog input signal value; the ADC circuitry (100; 200) further comprising a feedforward noise shaping loop (130; 130a, 130b; 230a, 230b) configured to store a quantization error signal based on digitizing a first sample, the comparator (120; 220) being configured to receive a feedforward noise shaping signal for changing the threshold for digitizing a later sample of the analog input signal following the first sample.

公开(公告)号：EP3745103A1

公开(公告)日：2020-12-02

申请号：EP19177264.9

申请日：2019-05-29

申请人： IMEC vzw ,  Katholieke Universiteit Leuven KU Leuven Research & Development ,  Stichting IMEC Nederland

发明人： LIN, Qiuyang ,  XU, Jiawei ,  SONG, Shuang ,  VAN HELLEPUTTE, Nick ,  TAVERNIER, Filip

IPC分类号： G01J1/44 ,  G01J1/46 ,  A61B5/024 ,  A61B5/1455 ,  H03M1/00

摘要： A light-to-digital converter (2) comprises a light-to-current converter (10); a current integrator (4) with an integrator output (30) resettable to a baseline level; and a counter (18) with a digital output (26), wherein the light-to-current converter (10) is switchably connectable as a positive integration input to the current integrator (4), for, during a light-collecting phase (404-406), integrating a current from the light-to-current converter (10), the integrator output (30) starting from the baseline value and ending at a value to be digitized; a reference current source (14) is switchably connectable as a negative integration input to the current integrator (4), for, during a counting phase (406-408) subsequent to the light-collecting phase (404-406), integrating a reference current from the reference current source (14), the integrator output (30) starting from the value to be digitized and ending at the baseline value, the time spent integrating the reference current corresponding to the value to be digitized; and the counter (18) is configured for measuring the time.

公开(公告)号：EP3501381A1

公开(公告)日：2019-06-26

申请号：EP17210372.3

申请日：2017-12-22

申请人： Stichting IMEC Nederland ,  IMEC vzw

发明人： ZHANG, Yifan ,  GROENENDAAL, Willemijn ,  SONG, Shuang ,  VULLINGS, Rik

IPC分类号： A61B5/00 ,  A61B5/024

摘要： A method for time domain signal reconstruction for representing heart activity of a subject from a photoplethysmogram (PPG) signal comprises: receiving (402) a PPG signal carrying information of heart activity of the subject; decomposing (404) frequency information of the PPG signal into a plurality of components, each component having a frequency spectrum and a weight; for each component of the plurality of components: comparing (406) the frequency spectrum of the component to a spectrum mask based on an estimate of heart rate of the subject; and adjusting (408) the weight of the component based on the comparing; and reconstructing (410) a time domain signal based on recombination of the plurality of components with adjusted weights.

公开(公告)号：EP3501382A1

公开(公告)日：2019-06-26

申请号：EP17210448.1

申请日：2017-12-22

申请人： Stichting IMEC Nederland ,  IMEC vzw

发明人： ZHANG, Yifan ,  GROENENDAAL, Willemijn ,  SONG, Shuang ,  VULLINGS, Rik

IPC分类号： A61B5/00 ,  A61B5/024

摘要： A system (100) for motion artifact reduction in a photoplethysmogram, PPG, signal representing heart activity of a subject, comprises: a processing unit (120), said processing unit (120) being configured to: receive (302) a PPG signal carrying information of heart activity of the subject; receive (304) a motion reference signal carrying information of a motion of the subject; form (306) a PPG time-frequency representation, based on the PPG signal, and a motion reference time-frequency representation, based on the motion reference signal; and subtract (308) a weighted representation of the motion reference time-frequency representation from the PPG time-frequency representation for reducing a motion artifact component in the PPG time-frequency representation and form a cleaned time-varying frequency spectrum of the PPG signal.