Patent ID: 9591981
Date: 2017-03-14
CPC Classifications: A61B

Claim:
1. Apparatus for acquiring electrical signals from a living subject, comprising: an injection electrode adapted to be attached to a surface of a body of the subject; input electrodes adapted to be attached to a surface of a body of the subject; and a processor, which is configured to: inject a known calibration signal to the subject via the injection electrode, acquire the known calibration signal at the input electrodes, the input electrodes being adapted to generate output signals in response to the calibration signals, measure respective levels of output signals generated at the input electrodes in response to the calibration signal, derive respective weighting factors for each input electrode in response to the respective levels using a correction vector comprising a numerical measure of the known calibration signal acquired by each input electrode, and apply the respective weighting factors to physiological signals acquired by the input electrodes, so as to generate respective corrected physiological signals.