Diotic presentation of second-order gradient directional hearing aid signals

• US 20030215106A1
• Filed: 05/15/2002
• Published: 11/20/2003
• Est. Priority Date: 05/15/2002
• Status: Active Grant

• Current Assignee: Starkey Laboratories Incorporated
• Original Assignee: Micro Ear Technology Incorporated (Starkey Laboratories Incorporated)
• Inventors: Preves, David A., Roberts, Randall W., Peterson, Timothy S., Hagen, Lawrence, Bren, Mark A.
• Granted Patent: US 7,369,669 B2
• Time in Patent Office: Days
• US Class Current: 381/313
• CPC Class Codes: H04R 2225/53 Hearing aid for unilateral hearing impairment using Contralateral Routing Of Signals [CROS]
• CPC Class Codes: H04R 25/405 by combining a plurality of transducers
• CPC Class Codes: H04R 25/407 Circuits for combining signals of a plurality of transducers
• CPC Class Codes: H04R 25/552 Binaural

Abstract

Systems, devices and methods are provided for diotically presenting second-order gradient directional hearing aid signals. The present subject matter provides an improved signal-to-noise ratio, and presents a desired directional signal to each ear. One aspect is a hearing aid system. In one embodiment, the system includes a first microphone system in a first device and a second microphone system in a second device. The first microphone system has a first output signal, and the second microphone system has a second output signal. Each output signal includes a first-order directional signal. The system further includes a first receiver circuit and a second receiver circuit. The combination of the first output signal and the second output signal provides a diotic presentation of a second-order gradient signal to both the first receiver circuit and the second receiver circuit. Other aspects are provided herein.

Claims

1. A hearing aid system, comprising:

a first microphone system positioned in a first device for receiving sound and having a first output signal representative of the sound received, wherein the first output signal includes a first-order gradient directional hearing aid signal;

a second microphone system positioned in a second device for receiving sound and having a first output signal representative of the sound received, wherein the second output signal includes a first-order pressure gradient directional hearing aid signal;

a first receiver circuit positioned in the first device for aiding hearing in a first ear of a wearer, the first receiver circuit being connected to the first microphone system to receive the first output signal and connected to the second microphone system to receive the second output signal; and

a second receiver circuit positioned in the second device for aiding hearing in a second ear of a wearer, the second receiver circuit being connected to the first microphone system to receive the first output signal and connected to the second microphone system to receive the second output signal,

wherein the first output signal and the second output signal provide a diotic presentation of a second-order gradient signal to the first receiver circuit and the second receiver circuit.

2. The system of claim 1, wherein each of the first and second microphone systems includes a switch-selectable directional-omnidirectional microphone system for providing a directional mode of operation in which the first-order gradient directional hearing aid signal is produced and an omnidirectional mode of operation in which an omnidirectional signal is produced.

3. The system of claim 2, wherein the switch-selectable directional-omnidirectional microphone system includes a directional microphone for providing the directional mode of operation and an omnidirectional microphone for providing the omnidirectional mode of operation.

4. The system of claim 2, wherein the switch-selectable directional-omnidirectional microphone system includes:

a first omnidirectional microphone system having a first omnidirectional output signal representative of the sound received; and

a second omnidirectional microphone system having a second omnidirectional output signal representative of the sound received,

wherein the first omnidirectional output signal and the second omnidirectional output signal are summed in the directional mode of operation to provide the first-order gradient directional hearing aid signal, and

wherein one of the first and the second omnidirectional signals provides the omnidirectional signal in the omnidirectional mode of operation.

5. The system of claim 1, wherein:

the first receiver circuit includes a first receiver and a first signal processing circuit for receiving the first output signal and providing a first processed signal representative of the sound received to the first receiver; and

the second receiver circuit includes a second receiver and a second signal processing circuit for receiving the second output signal and providing a second processed signal representative of the sound received to the second receiver.

6. The system of claim 5, wherein:

the first signal processing circuit includes an adjust phase module and an adjust gain module for adjusting a phase and a gain of the second output signal and summing the first output signal and the second output signal; and

the second signal processing circuit includes an adjust phase module and an adjust gain module for adjusting a phase and a gain of the first output signal and summing the first output signal and the second output signal.

7. A hearing aid system, comprising:

a first instrument for aiding hearing in a first ear of a wearer, including;

a first microphone system for receiving sound and having a first output signal representative of the sound received, wherein the first output signal includes a first-order directional signal; and

a first receiver circuit connected to the first microphone system to receive the first output signal; and

a second instrument for aiding hearing in a second ear of a wearer, including;

a second microphone system for receiving sound and having a second output signal representative of the sound received, wherein the second output signal includes a first-order directional signal; and

a second receiver circuit connected to the second microphone system to receive the second output signal,

wherein the first-order directional signals from the first microphone system and the second microphone system are combined to provide a second-order directional signal that is diotically presented to the first receiver circuit and the second receiver circuit.

8. The system of claim 7, further comprising at least one electrical conductor between the first instrument and the second instrument for transmitting the first output signal from the first microphone system to the second receiver circuit, and the second output signal from the second microphone system to the first receiver circuit.

9. The system of claim 8, wherein the at least one electrical conductor includes a removable cord for removable attachment to sockets in the first instrument and the second instrument.

10. The system of claim 7, further comprising a wireless link between the first instrument and the second instrument for transmitting the first output signal from the first microphone system to the second receiver circuit, and the second output signal from the second microphone system to the first receiver circuit.

11. The system of claim 10, wherein the wireless link includes a two-way wireless link.

12. The system of claim 10, wherein the wireless link includes two one-way wireless links.

13. The system of claim 7, wherein the first and second microphone systems each include a switch-selectable directional-omnidirectional microphone for providing a directional mode of operation in which the first-order directional signal is produced and an omnidirectional mode of operation in which an omnidirectional signal is produced.

14. The system of claim 7, further comprising a switch for disconnecting the second microphone system from the first receiver circuit and disconnecting the second receiver circuit from the first microphone system to move from a mode of operation that provides a diotic presentation of the second-order directional signal to a mode of operation that provides first-order directional signals to the first and second receiver circuits.

15. The system of claim 7, wherein:

the first microphone system has a directional mode of operation in which a first directional signal is produced as the first output signal and an omnidirectional mode of operation in which a first omnidirectional signal is produced as the first output signal;

the second microphone system has a directional mode of operation in which a second directional signal is produced as the second output signal and an omnidirectional mode of operation in which a second omnidirectional signal is produced as the second output signal;

the system further comprises a user-wearable switch for selecting a desired mode of operation from an omnidirectional mode of operation in which the first receiver circuit receives the first omnidirectional signal and the second receiver circuit receives the second omnidirectional signal, a first-order gradient mode of operation in which the first receiver circuit receives the first directional signal and the second receiver circuit receives the second directional signal, and a summed second-order gradient mode of operation in which a second-order directional signal is diotically presented to the first and second receivers.

16. The system of claim 7, wherein:

the first receiver circuit includes a first receiver and a first signal processing circuit for receiving the first output signal and providing a first processed signal representative of the sound received to the first receiver; and

the second receiver circuit includes a second receiver and a second signal processing circuit for receiving the second output signal and providing a second processed signal representative of the sound received to the second receiver.

17. The system of claim 16, wherein:

the first signal processing circuit includes an adjust phase module and an adjust gain module for adjusting a phase and a gain of the second output signal and summing the first output signal and the second output signal; and

the second signal processing circuit includes an adjust phase module and an adjust gain module for adjusting a phase and a gain of the first output signal and summing the first output signal and the second output signal.

18. A hearing aid system, comprising a first hearing aid device and a second hearing device, each hearing device including:

a microphone system for receiving a sound and providing a signal representative of the sound, the microphone system including;

a directional microphone system for providing a first-order pressure gradient directional signal representative of the sound; and

an omnidirectional microphone system for providing an omnidirectional signal representative of the sound;

a switch for selecting a mode of operation to provide a selected signal, wherein;

when an omnidirectional mode of operation is selected, the selected signal includes the omnidirectional signal representative of the sound;

when a first-order gradient directional mode of operation is selected, the selected signal includes the first-order pressure gradient directional signal; and

when a second-order gradient directional mode of operation is selected, the selected signal includes a sum of the first-order pressure gradient directional signals from the microphone system for both the first and the second hearing aid devices;

signal processing circuitry for receiving and processing the selected signal into a processed signal representative of the sound; and

a receiver for receiving the processed signal to produce a processed sound that aids hearing.

19. The system of claim 18, when a diotic omnidirectional mode is selected, the selected signal includes a sum of the omnidirectional signals from the microphone system for both the first and the second hearing aid devices.

20. The system of claim 18, wherein the microphone system includes a switch-selectable directional-omnidirectional microphone for providing the directional microphone system when either the first-order or second-order gradient directional mode of operation is selected and for providing the omnidirectional microphone system when an omnidirectional mode of operation is selected.

21. The system of claim 18, wherein the microphone system includes:

a first omnidirectional microphone system having a first omnidirectional output signal representative of the sound; and

a second omnidirectional microphone system having a second omnidirectional output signal representative of the sound,

wherein the first omnidirectional output signal and the second omnidirectional output signal are summed in either the first-order or second-order gradient directional mode of operation to provide the first-order gradient directional signal, and

wherein one of the first and the second omnidirectional signals provides the omnidirectional signal in the omnidirectional mode of operation.

22. The system of claim 18, further comprising a cable removably attached between the first hearing aid device and the second hearing aid device, wherein the first-order pressure gradient directional signals are transmitted through the cable and, when the cable is removed, both the first hearing aid device and the second hearing aid device function as an individual first-order gradient directional hearing aid device.

23. A method for diotically presenting second-order gradient directional signals to a wearer of hearing aids, comprising:

receiving a sound both at a first microphone system in a first hearing aid device to provide a first-order gradient directional signal representative of the sound received and at a second microphone system in a second hearing aid device to provide a first-order gradient directional signal representative of the sound received;

summing the first-order gradient signals provided by the first microphone system and the second microphone system to provide a second-order gradient directional signal; and

presenting the second-order gradient directional signal to a first receiver in the first hearing aid device and to a second receiver in the second hearing aid device.

24. The method of claim 23, further comprising adjusting a gain for at least one of the first-order gradient signals prior to summing the first-order gradient signal.

25. The method of claim 23, further comprising adjusting a phase delay for at least one of the first-order gradient signals prior to summing the first-order gradient signal.

26. The method of claim 23, further comprising adjusting a gain and a phase delay for at least one of the first-order gradient signals prior to summing the first-order gradient signal.

27. The method of claim 23, further comprising, for a first directional mode of operation:

operating a first switch to prevent the first-order gradient signals from being summed;

presenting the first-order gradient signal provided by the first microphone system to the first receiver; and

presenting the first-order gradient signal provided by the second microphone system to the second receiver.

28. The method of claim 27, further comprising, for a second directional mode of operation:

operating a second switch such that the first microphone system provides an omidirectional signal representative of the sound received in the first hearing aid rather than the first-order gradient directional signal;

operating a third switch such that the second microphone system provides an omnidirectional signal representative of the sound received in the second hearing aid rather than the first-order gradient directional signal;

presenting the omnidirectional signal provided by the first microphone system to the first receiver; and

presenting the omnidirectional signal provided by the second microphone system to the second receiver.

29. The method of claim 23, wherein summing the first-order gradient signals provided by the first microphone system and the second microphone system to provide a second-order gradient directional signal includes transmitting the first-order gradient signals between the first microphone system and the second microphone system through at least one conductor.

30. The method of claim 23, wherein summing the first-order gradient signals provided by the first microphone system and the second microphone system to provide a second-order gradient directional signal includes transmitting the first-order gradient signals between the first microphone system and the second microphone system through a wireless link.

31. The method of claim 30, wherein transmitting the first-order gradient signals between the first microphone system and the second microphone system through a wireless link includes transmitting the first-order gradient signals through a two-way wireless link.

32. The method of claim 30, wherein transmitting the first-order gradient signals between the first microphone system and the second microphone system through a wireless link includes transmitting the first-order gradient signals through a two one-way wireless links.

33. A method for aiding hearing for a user wearing a first hearing aid unit and a second hearing aid unit, comprising:

receiving a sound at a first microphone system in the first hearing aid unit and at a second microphone system in the second hearing aid unit;

for a first mode of operation, providing a first omnidirectional signal representative of the sound from the first microphone system to a first receiver in the first hearing aid unit and a second omnidirectional signal representative of the sound from the second microphone system to a second receiver in the second hearing aid unit;

for a second mode of operation, providing a first directional signal representative of the sound from the first microphone system to the first receiver in the first hearing aid unit and a second directional signal representative of the sound from the second microphone system to the second receiver in the second hearing aid unit; and

for a third mode of operation, summing the first directional signal from the first microphone system to the second directional signal from the second microphone system to form a second-order gradient directional signal representative of the sound, and diotically presenting the second-order gradient directional signal to the first receiver in the first hearing aid unit and to the second receiver in the second hearing aid unit.

34. The method of claim 33, further comprising operating a switch to select a mode of operation from the first, second and third modes of operation.

35. The method of claim 33, wherein operating a switch includes manually operating a switch.

36. The method of claim 33, wherein operating a switch includes magnetically operating a reed switch.

37. The method of claim 33, wherein operating a switch includes operating a programmable memory switch.

38. The method of claim 33, wherein summing the first directional signal from the first microphone system to the second directional signal from the second microphone system includes electrically connecting an output of the first microphone system to an output of the second microphone system.

39. The method of claim 38, wherein summing the first directional signal from the first microphone system to the second directional signal from the second microphone system further includes adjusting a gain and a phase delay for at least one of the first directional signal and the second directional signal.

40. The method of claim 33, wherein summing the first directional signal from the first microphone system to the second directional signal from the second microphone system includes transmitting the first directional signal from the first microphone system to the second receiver through a first wireless link and transmitting the second directional signal from the second microphone system to the first receiver through a second wireless link.

41. The method of claim 40, wherein summing the first directional signal from the first microphone system to the second directional signal from the second microphone system further includes adjusting a gain and a phase delay for at least one of the first directional signal and the second directional signal.