Novel biosignal acquisition method and algorithms for wearable devices

A method, comprising:

• locating a set of N electrodes in proximity to an epidermis of a subject so as to acquire signals generated by electric sources within the subject;
• transferring the signals via a set of M channels, where M is less than N;
• selecting repetitively and randomly, M signals from the N electrodes, and directing the M signals to the M channels via a switch:
• and
• activating the switch, and receiving and analyzing the M signals from the M channels so as to determine respective positions of the electric sources within the subject.

A method, comprising:

• positioning a set of N electrodes on an epidermis of a subject, wherein the electrodes are configured to acquire signals from the subject;
• selecting a subset of the N electrodes that are in proximity with each other;
• measuring impedances of the subset relative to each other;
• and
• when the impedances change, using the change of impedances to estimate a change in the acquired signals, and applying the change in the acquired signals so as to correct the acquired signals.

A method, comprising:

• positioning a set of N electrodes on an epidermis of a subject, wherein the electrodes are configured to acquire signals from the subject;
• while the subject is performing an initial gesture, injecting a signal into the subject via at least one of the N electrodes, and measuring N respective potentials generated at the N electrodes in response to the injection;
• formulating an initial matrix of the N respective potentials and the at least one of the N electrodes;
• forming a correspondence between the initial matrix and the initial gesture;
• and
• using the correspondence to recognize that a subsequent gesture of the subject corresponds to the initial gesture.

Apparatus, comprising:

• a set of N electrodes configured to be positioned on an epidermis of a subject, wherein the electrodes are configured to acquire signals from the subject;
• a switch connected to the set of N electrodes;
• and
• a controller configured to:
• while the subject is performing an initial gesture, inject a signal into the subject via at least one of the N electrodes, and measure N respective potentials generated at the N electrodes in response to the injection;
• formulate an initial matrix of the N respective potentials and the at least one of the N electrodes;
• form a correspondence between the initial matrix and the initial gesture;
• and
• use the correspondence to recognize that a subsequent gesture of the subject corresponds to the initial gesture.