HEARING AID ADAPTED FOR DETECTING BRAIN WAVES AND A METHOD FOR ADAPTING SUCH A HEARING AID

• US 20120177233A1
• Filed: 01/12/2012
• Published: 07/12/2012
• Est. Priority Date: 07/13/2009
• Status: Active Grant

• Current Assignee: T&W Engineering A/S (WS Audiology A/S)
• Original Assignee: Widex A/S (WS Audiology A/S)
• Inventors: Ungstrup, Michael, Rank, Mike Lind, Kidmose, Preben, Mandic, Danilo P., Looney, David, Park, Cheolsoo
• Granted Patent: US 9,025,800 B2
• Time in Patent Office: Days
• US Class Current: 381/314
• CPC Class Codes: A61B 2562/0215 Silver or silver chloride containing
• CPC Class Codes: A61B 5/121 evaluating hearing capacity
• CPC Class Codes: A61B 5/38 Acoustic or auditory stimuli
• CPC Class Codes: A61B 5/6815 Ear
• CPC Class Codes: A61B 5/6838 Clamps or clips
• CPC Class Codes: G06F 3/015 Input arrangements based on nervous system activity detection, e.g. brain waves [EEG] detection, electromyograms [EMG] detection, electrodermal response detection
• CPC Class Codes: H04R 2225/41 Detection or adaptation of hearing aid parameters or programs to listening situation, e.g. pub, forest
• CPC Class Codes: H04R 25/70 Adaptation of deaf aid to hearing loss, e.g. initial electronic fitting

Abstract

A hearing aid comprises an amplifier (303, 309, 317), an input transducer (301), an output transducer (824) and a signal processing device (825). The amplifier (303, 309, 317) and the signal processing device (825) are connected. The hearing aid further comprises at least two electrodes (201-205) adapted for detecting electrical signals such as brain waves, the at least two electrodes (201-205) being connected to a differential amplifier (303, 309, 317), which in turn is connected to the signal processing device, and means for modifying the operation of said hearing aid in dependence of the detected signals. The invention further provides a method for adaptation of a hearing aid.

Claims

1. A hearing aid comprising an amplifier, an input transducer, an output transducer and a signal processing device, said amplifier and said signal processing device being connected;

at least two electrodes adapted for detecting electrical signals such as brain waves, the at least two electrodes being connected to a differential amplifier, which in turn is connected to the signal processing device; and

means for modifying the operation of said hearing aid in response to the detected signals.

2. The hearing aid according to claim 1, wherein said signal processing device comprises feature extraction means for extracting at least one feature from a signal detected by means of said at least two electrodes and classifying means for classifying said at least one feature extracted by said feature extraction means.

3. The hearing aid according to claim 1, comprising a microphone connected to said feature extraction means.

4. The hearing aid according to claim 1, comprising means for comparing a signal detected by means of said at least two electrodes with a predefined set of attention classes.

5. The hearing aid according to claim 1, wherein said means for modifying the operation of the hearing aid modifies the operation of said hearing aid in response to said at least one feature extracted by said feature extraction means.

6. The hearing aid according to claim 1, wherein said means for modifying the operation of said hearing aid is activated by said hearing aid upon recognizing by means of said signal processing device a detected signal as comprising characteristics of at least one of a hearing threshold measurement, a hearing loss measurement, an attention focus measurement and a Brain-Computer Interface action measurement.

7. The hearing aid according to claim 1, wherein the at least two electrodes are arranged on or in a surface of a part of the hearing aid, preferably a plug of said hearing aid, such that when said hearing aid is worn by a user, said at least two electrodes are in physical contact with tissue of said user.

8. The hearing aid according to claim 1, comprising a fluid, conductive gel in connection with said at least two electrodes.

9. The hearing aid according to claim 1, wherein said at least two electrodes are silver electrodes.

10. A hearing aid system comprising a first and a second hearing aid, each one of the first and the second hearing aid having an amplifier, an input transducer, an output transducer and a signal processing device, said amplifier and said signal processing device being connected;

at least two electrodes adapted for detecting electrical signals such as brain waves, the at least two electrodes being connected to a differential amplifier, which in turn is connected to the signal processing device; and

means for modifying the operation of said hearing aid in response to the detected signals, at least one of the first and second hearing aid comprising a signal processing device comprising a feature extraction means and a classifying means, and wherein at least one of the first and second hearing aids comprises transmitting means for transmitting information to the second or first hearing aid, respectively.

11. The hearing aid system according to claim 10, wherein the signal processing means further comprises a class combining means.

12. The hearing aid system according to claim 10 wherein said feature extraction means, said classification means and said class combining means of said first and second hearing aid, respectively, are interconnected by means of said transmitting means.

13. The hearing aid system according to claim 10, wherein said transmitting means is wireless.

14. A method for adaptation of a hearing aid during use by a user, the method comprising the following steps:

providing a hearing aid, said hearing aid having an amplifier, an input transducer, an output transducer and a signal processing device, said amplifier and said signal processing device being connected;

at least two electrodes adapted for detecting electrical signals such as brain waves, the at least two electrodes being connected to a differential amplifier, which in turn is connected to the signal processing device; and

means for modifying the operation of said hearing aid in response to the detected signals.

measuring a brain signal from said user, and

adjusting the operation of said hearing aid in response to the detected signal.

15. The method according to claim 14, comprising comparing said measured signal with a predefined set of attention classes.

16. The method according to claim 14 comprising repeating said measuring, comparing and adjusting steps with a predetermined frequency.

17. The method according to claim 15 wherein said comparing step comprises:

extracting a feature from the measured brain signal by executing a first algorithm in said signal processing device, and

classifying said feature by executing a second algorithm in said signal processing device.

18. The method according to claim 15, wherein at least a part of said comparing step is performed using signal processing based on Empirical Mode Decomposition (EMD).