US 11,857,341 B2
Systems and methods of spatial filtering for measuring electrical signals
Johannes Anne Bruinsma, Drachten (NL); Erno H. Klaassen, Los Altos, CA (US); Paras Samsukha, San Jose, CA (US); and Xiaoyu Guo, Santa Clara, CA (US)
Assigned to Apple Inc., Cupertino, CA (US)
Filed by Apple Inc., Cupertino, CA (US)
Filed on Jun. 7, 2021, as Appl. No. 17/340,257.
Application 17/340,257 is a continuation of application No. 15/275,129, filed on Sep. 23, 2016, granted, now 11,026,628.
Claims priority of provisional application 62/235,362, filed on Sep. 30, 2015.
Prior Publication US 2021/0290159 A1, Sep. 23, 2021
Int. Cl. A61B 5/282 (2021.01); A61B 5/00 (2006.01); A61B 5/304 (2021.01); A61B 5/316 (2021.01); A61B 5/332 (2021.01)
CPC A61B 5/681 (2013.01) [A61B 5/0006 (2013.01); A61B 5/282 (2021.01); A61B 5/304 (2021.01); A61B 5/316 (2021.01); A61B 5/332 (2021.01); A61B 5/7214 (2013.01); A61B 2560/0468 (2013.01); A61B 2562/0209 (2013.01)] 21 Claims
OG exemplary drawing
 
1. A method comprising:
contacting a first skin region of a user with a plurality of measurement electrodes located on a surface of a wearable device;
obtaining a noise level for each of the plurality of measurement electrodes;
selecting, using the noise levels, a first group of measurement electrodes from the plurality of measurement electrodes;
selecting, using the noise levels, a sampling rate or frequency for each of the first group of measurement electrodes;
performing a scan by sampling each measurement electrode at the sampling rate or frequency to generate a measurement signal from each of the first group of measurement electrodes;
transmitting, to a controller, a measurement signal obtained from each of the first group of measurement electrodes; and
determining one or more physiological parameters from the measurement signals obtained from the first group of measurement electrodes.