Active unipolar dry electrode open ear wireless headset and brain computer interface

1. A wearable audio product for obtaining biologically-relevant information associated with a user comprising:

a first electrode placed over the user's auditory cortex on a first side of the user's body;

a second electrode placed on the first side of the user's body;

a first reference electrode placed on the first side of the user's body;

a third electrode placed over the user's auditory cortex on a second side of the user's body;

a fourth electrode placed on the second side of the user's body; and

a second reference electrode placed on the second side of the user's body,

a processor coupled to the first, second, first reference, third, fourth, and second reference electrodes, the processor configured to take one or more actions based on signals received from the first, second, first reference, third, fourth, and second reference electrodes,

wherein taking the one or more actions comprises:

combining signals from first side movement artifacts, the user's brain signals detected by the first and second electrodes, and the first reference electrode to generate a combined first side signal;

combining signals from second side movement artifacts, the user's brain signals detected by the third and fourth electrodes, and the second reference electrode to generate a combined second side signal;

comparing the combined first side signal and the combined second side signal to output a difference for the first side and a difference for the second side;

applying a first closed feedback loop for signals received from the first side of the body including the difference for the first side signal,

applying a second closed feedback loop for signals received from the second side of the body including the difference for the second side signal, and

removing noise from the received signals based on the first and second closed feedback loops, wherein removing the noise comprises cross-correlating the signals received from the first side of the body with the signals received from the second side of the body; and

an electroacoustic transducer coupled to the processor.

2. The audio product of claim 1 , wherein one of the second electrode or the fourth electrode is placed over one of: the user's occipital lobe or in an ear canal of the user.

3. The audio product of claim 1 , wherein one of the first reference electrode or the second reference electrode is placed on the skull of the user behind the user's ear.

4. The audio product of claim 1 , wherein taking the one or more actions further comprises:

determining a state of the user based on the signals received via the first side of the body comprising the first electrode, the second electrode, and the first reference electrode, or the second side of the body comprising the third electrode, the fourth electrode, and the second reference electrode; and

taking the one or more actions based on the determined state.

5. The audio product of claim 4 , wherein determining the state of the user further comprises:

determining a drop in impedance of the signals received via at least one of the first electrode, the second electrode, the first reference electrode, the third electrode, the fourth electrode, and the second reference electrode; and

in response to the determined drop in the impedance, determining the state of the user is stressed.

6. The audio product of claim 5 , wherein taking the one or more actions based on the determined state comprises:

tracking a type of music played by the audio product in response to determining the state of the user is stressed; and in response to determining the state of the user is stressed, recommending at least one of a song or melody based on the tracked type of music.

7. The audio product of claim 4 , wherein determining the state of the user further comprises:

determining a decreased rate of blinking of the user based on the signals received via at least one of the first electrode, the second electrode, the third electrode, and the fourth electrode; and in response to the determined decreased rate of blinking, determining the user is focused.

8. The audio product of claim 7 , wherein taking the one or more actions based on the determined state comprises:

in response to determining the user is focused, recommending a certain song or melody played by the audio product.

9. The audio product of claim 4 , wherein determining the state of the user further comprises:

measuring jaw movements based on the signals received from at least one of the first electrode, the second electrode, the first reference electrode, the third electrode, the fourth electrode, and the second reference electrode; and

in response to the measured jaw movements, determining the user is talking.

10. The audio product of claim 9 , wherein taking the one or more actions based on the determined state comprises:

adjusting a volume of music played by the audio product in response to determining the user is talking.

11. The audio product of claim 9 , wherein taking the one or more actions based on the determined state comprises:

triggering automatic speech recognition (ASR) in response to determining the user is talking.

12. The audio product of claim 9 , wherein taking the one or more actions based on the determined state comprises: entering a low power mode in response to determining the user is not talking.

13. A method for obtaining biologically-relevant information associated with a user from a wearable audio product including an electroacoustic transducer coupled to a processor, comprising:

receiving, by the processor, electrical signals via a first electrode placed over the user's auditory cortex on a first side of the user's body;

receiving, by the processor, electrical signals via a second electrode placed on the first side of the user's body;

receiving, by the processor, electrical signals via a first reference electrode placed on the first side of the user's body;

receiving, by the processor, electrical signals via a third electrode placed over the user's auditory cortex on a second side of the user's body;

receiving, by the processor, electrical signals via a fourth electrode placed on the second side of the user's body;

receiving, by the processor, electrical signals via a second reference electrode placed on the second side of the user's body; and

taking, by the processor, one or more actions based, at least in part, on the signals received from the first, second, first reference, third, fourth, and second reference electrodes, wherein taking the one or more actions comprises:

combining the signals from first side movement artifacts, the user's brain signals detected by the first and second electrodes, and the first reference electrode to generate a combined first side signal;

combining the signals from second side movement artifacts, the user's brain signals detected by the third and fourth electrodes, and the second reference electrode to generate a combined second side signal;

comparing the combined first side signal and the combined second side signal to output a difference for the first side and a difference for the second side;

applying a first closed feedback loop for the signals received from the first side of the body including the difference for the first side signal,

applying a second closed feedback loop for the signals received from the second side of the body including the difference for the second side signal, and

removing noise from the received signals based on the first and second closed feedback loops, wherein removing the noise comprises cross-correlating the signals received from the first side of the body with the signals received from the second side of the body.

14. The method of claim 13 , wherein the second electrode or the fourth electrode is placed over one of the user's occipital lobe or in an ear canal of the user.

15. A wearable audio product including an electroacoustic transducer for obtaining biologically-relevant information associated with a user comprising:

a first electrode, a second electrode, and a first reference electrode each placed on a first side of the user's body;

a third electrode, a fourth electrode, and a second reference electrode each placed on a second side of the user's body; and

a processor coupled to the first, second, third, fourth, first reference, and second reference electrodes, wherein the processor is configured to:

perform noise canceling on signals received via the first, second, third, and fourth electrodes, wherein performing the noise canceling comprises:

combining signals from first side movement artifacts, the user's brain signals detected by the first and second electrodes, and the first reference electrode to generate a combined first side signal;

combining signals from second side movement artifacts, the user's brain signals detected by the third and fourth electrodes, and the second reference electrode to generate a combined second side signal;

comparing the combined first side signal and the combined second side signal to output a difference for the first side and a difference for the second side;

apply a first closed feedback loop for signals received from the first side of the body including the difference for the first side signal;

apply a second closed feedback loop for signals received from the second side of the body including the difference for the second side signal; and

remove noise from the received signals based on the first and second closed feedback loops, wherein removing the noise comprises cross-correlating the signals received from the first side of the body with the signals received from the second side of the body; and

control the audio-product based on the noise-canceled signals.

16. The wearable audio product of claim 15 , wherein the second and fourth electrodes are placed over one of: the first and second side of the user's occipital lobe or in each ear canal of the user.