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Body-driven pseudorandom signal injection for biomedical acquisition channel calibration

  • US 9,968,301 B2
  • Filed: 07/09/2014
  • Issued: 05/15/2018
  • Est. Priority Date: 07/09/2014
  • Status: Active Grant
First Claim
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1. A method comprising:

  • measuring biopotential signals produced by a patient'"'"'s body, wherein the measuring is at a sensing electrode configured to be coupled to the patient'"'"'s body, wherein the measuring comprises;

    driving, via a monitoring circuitry, a pseudorandom noise (PN) signal, said PN signal being driven to the patient'"'"'s body at a reference electrode configured to be coupled to the patient'"'"'s body;

    receiving at the sensing electrode a biopotential signal and a distorted PN signal;

    synchronizing, via the monitoring circuitry, the PN signal driven to the patient'"'"'s body and the distorted PN signal received at the sensing electrode;

    determining, via the monitoring circuit, a signal-path gain A(t) based on the PN signal driven to the reference electrode and the distorted signal received by the sensing electrode;

    detecting, via the monitoring circuitry, a multiplicative motion artifact (MMA) using the signal-path gain A(t); and

    adjusting and employing, via the monitoring circuitry, a digital or analog programmable gain compensator to stabilize the signal-path gain A(t).

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