Data gathering system
First Claim
1. An apparatus for gathering data, the apparatus comprising:
- a band configured to be worn by a subject, the band comprising a first electrode configured to capacitively or conductively couple with a body of the subject while the band is worn by the subject;
wherein the first electrode is a non-adhesive, dry electrode;
a second electrode configured to capacitively or conductively couple with something other than the body of the subject; and
a circuit coupled to the first electrode and the second electrode, the circuit comprising;
a first shield actively shielding the first electrode;
a second shield actively shielding the second electrode;
driver circuitry coupled to the first shield and the second shield; and
a third shield surrounding the driver circuitry and located physically between the first shield and the second shield, the third shield electrically insulated from the first shield and the second shield;
wherein the circuit is configured to detect a signal according to a first instantaneous potential at the first electrode and a second instantaneous potential at the second electrode.
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Accused Products
Abstract
A device for gathering data has first and second electrodes. The first electrode is coupled to a surface of interest, and the second electrode is coupled to “everything else” or “the air”. The first electrode is shielded from the second, and from most sources of parasitic capacitance, by a shield that is driven by an active driver that drives the shield to track, and ideally to match, the instantaneous potential of the electrode. The second electrode is likewise shielded in a similar way from most sources of parasitic capacitance. These shields likewise help to limit the extent to which RFI from the device electronics couples with either of the electrodes. In this way the sensing device achieves a markedly better signal-to-noise ratio at frequency bands of interest.
1389 Citations
21 Claims
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1. An apparatus for gathering data, the apparatus comprising:
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a band configured to be worn by a subject, the band comprising a first electrode configured to capacitively or conductively couple with a body of the subject while the band is worn by the subject; wherein the first electrode is a non-adhesive, dry electrode; a second electrode configured to capacitively or conductively couple with something other than the body of the subject; and a circuit coupled to the first electrode and the second electrode, the circuit comprising; a first shield actively shielding the first electrode; a second shield actively shielding the second electrode; driver circuitry coupled to the first shield and the second shield; and a third shield surrounding the driver circuitry and located physically between the first shield and the second shield, the third shield electrically insulated from the first shield and the second shield; wherein the circuit is configured to detect a signal according to a first instantaneous potential at the first electrode and a second instantaneous potential at the second electrode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for detecting a signal via a first electrode incorporated with a band configured to be worn by a subject, a second electrode, and a circuit coupled to the first electrode and the second electrode, the circuit comprising a first shield, a second shield, and driver circuitry coupled to the first shield and the second shield, the method comprising:
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capacitively or conductively coupling the first electrode to a body of the subject while the band is worn by the subject; wherein the first electrode is a non-adhesive, dry electrode; capacitively or conductively coupling the second electrode to something other than the body of the subject; actively shielding the first electrode via the first shield; actively shielding the second electrode via the second shield; shielding the driver circuitry via a third shield located physically between the first shield and the second shield, the third shield electrically insulated from the first shield and the second shield; and detecting the signal according to a first instantaneous potential at the first electrode and a second instantaneous potential at the second electrode. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21)
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Specification