Digital hearing aid system

• US 5,757,932 A
• Filed: 10/12/1995
• Issued: 05/26/1998
• Est. Priority Date: 09/17/1993
• Status: Expired due to Term

• Current Assignee: GN Resound A/S (GN Store Nord A/S)
• Original Assignee: AudioLogic, Inc. (Cirrus Logic Incorporated)
• Inventors: Melanson, John L., Bisgaard, Nikolai, Lindemann, Eric
• Primary Examiner(s): LE, HUYEN D
• Application Number:
  US08/542,158
• Time in Patent Office: 957 Days
• Field of Search: 381/68, 381/68.1, 381/68.2, 381/68.4, 381/68.6, 381/68.7, 381/69, 381/69.2, 128/746
• US Class Current: 381/312
• CPC Class Codes: H04R 25/356 Amplitude, e.g. amplitude shift or compression
• CPC Class Codes: H04R 25/505 using digital signal processing
• CPC Class Codes: H04R 25/552 Binaural
• CPC Class Codes: H04R 25/554 using a wireless connection, e.g. between microphone and amplifier or using Tcoils
• CPC Class Codes: H04R 25/558 Remote control, e.g. of amplification, frequency

Abstract

A detachable digital binaural processing hearing aid comprised of a digital signal processor (DSP), two microphones, two receivers, a bi-directional communications link between each microphone/receiver and the digital signal processor, an analog-to-digital converter, and a digital-to-analog converter. In one embodiment of the present invention, the user has the option of disabling the digital signal processor by either physically removing an external digital processing unit or by disabling a digital processor to permit an analog processor to provide audio enhancement. The user is also given the option of selecting from a variety of digital filters/compressors that generate binaural signals that are sent to both ears of the user. In a second embodiment, each hearing element comprises a digital signal processor and a communication link to the other hearing element. Two examples of the communication link are an electrical wire connecting the two hearing elements and a electromagnetic transceiving system where each hearing element has a transceiver that transmits a signal representing the sound at one ear of the user and receives a signal representing the sound at the other ear of the user.

Claims

1. A hearing aid comprising:

two audio microphones, each of said audio microphones positioned adjacent to one ear of a user, for receiving audio signals and for converting said audio signals to an analog input signal;

two analog-to-digital converters, for converting said analog input signals to a first digital signal;

a first binaural digital processor, disposed to receive said first digital signal, for selectably performing a binaural processing technique on said first digital signal and generating digital binaural output signals;

two digital-to-analog converters, for converting said digital binaural output signals to analog binaural output signals;

two audio receivers, each disposed to receive said analog binaural output signals, for converting said analog binaural output signals to a filtered audio signal to be transmitted into one of the ears of said user; and

a bidirectional communication system, for providing one of said analog input signals and said first digital signal to said first binaural digital processor, said first binaural digital processor performing a monaural processing technique when said bidirectional communication system is not operational.

2. The hearing aid of claim 1, further comprising:

a first hearing element, including;

a first of said two audio microphones,

a first of said two audio receivers,

a first of said two analog-to digital converters,

said first binaural digital processor, and

a first of said two digital-to-analog converters; and

a second hearing element, including;

a second of said two audio microphones,

a second of said two audio receivers,

a second of said analog-to-digital converters,

a second binaural digital processor, disposed to receive said second digital signal, for selectably performing a binaural processing technique on said second digital signal and generating second digital binaural output signals, said second digital processor performing a monaural processing technique when said bidirectional communication system is not operational, and

a second of said digital-to-analog converters.

3. The hearing aid of claim 2, wherein said bidirectional communication system includes a first wire coupling said first hearing element and said second hearing element.

4. The hearing aid of claim 2, wherein said bidirectional communication system includes:

a first transceiver, located in said first hearing element, for converting said analog input signals to first electromagnetic signals, for transmitting said first electromagnetic signals, and for receiving second electromagnetic signals transmitted from a second transceiver located in said second hearing element.

5. The hearing aid of claim 2, wherein said bidirectional communication system includes:

a first transceiver, located in said first hearing element, for converting said first digital signals to first electromagnetic signals, for transmitting said first electromagnetic signals, and for receiving second electromagnetic signals transmitted from a second transceiver located in said second hearing element.

6. The hearing aid of claim 2, wherein said first binaural digital processor performs a first portion of said binaural processing technique and said second binaural digital processor performs a second portion of said binaural processing technique.

7. The hearing aid of claim 6, further comprising a digital communications link disposed to transmit digital signals to and to receive digital signals from each of said first binaural digital processor and said second binaural digital processor.

8. The hearing aid of claim 2, further comprising:

a first analog processing system, coupled to said first audio microphone, for performing an analog processing technique on said analog input signal when said first binaural digital processor is not implemented;

a second analog processing system, coupled to said second audio microphone, for performing an analog processing technique on said analog input signal when said second binaural digital processor is not implemented.

9. The hearing aid of claim 1, further comprising:

a first hearing element, coupled to said bidirectional communication system, having;

a first of said two audio microphones,

a first of said two audio receivers, and

said first binaural digital processor; and

a second hearing element, having;

a second of said two audio microphones,

a second of said two audio receivers.

10. The hearing aid of claim 9, wherein said bidirectional communication system includes:

a wire connecting said first hearing element and said second hearing element.

11. The hearing aid of claim 9, wherein said bidirectional communication system includes:

a first transceiver, located in said first hearing element, for converting said analog input signals to first electromagnetic signals, for transmitting said first electromagnetic signals, and for receiving second electromagnetic signals; and

a second transceiver, located in said second hearing element, for converting said analog input signals to second electromagnetic signals, for transmitting said second electromagnetic signals, and for receiving said first electromagnetic signals.

12. The hearing aid of claim 9, wherein said bidirectional communication system includes:

a first transceiver, located in said first hearing element, for converting said first digital signals to first electromagnetic signals, for transmitting said first electromagnetic signals, and for receiving second electromagnetic signals; and

a second transceiver, located in said second hearing element, for converting said first digital signals to second electromagnetic signals, for transmitting said second electromagnetic signals, and for receiving said first electromagnetic signals.

13. The hearing aid of claim 1 further comprising:

a first hearing element, having;

a first of said two audio microphones,

a first of said two audio receivers, and

a first analog processing system, coupled to said first audio microphone, for performing an analog processing technique on said analog input signal when said first binaural digital processor is not implemented;

a second hearing element, having;

a second of said two audio microphones,

a second of said two audio receivers, and

a second analog processing system, coupled to said second audio microphone, for performing an analog processing technique on said analog input signal when said first binaural digital processor is not implemented; and

a first unit having

a power supply, and

said first binaural digital processor coupled to said power supply.

14. The hearing aid of claim 13, wherein said first unit further comprises a digital processor mode selection means, coupled to said first binaural digital processor, for selecting one of a plurality of binaural digital processing techniques to be implemented by said first binaural digital processor.

15. The hearing aid of claim 13, wherein said bidirectional communication system includes:

a first wire connecting said first binaural digital processor and said first element; and

a second wire connecting said first binaural digital processor and said second element.

16. The hearing aid of claim 13, wherein said bidirectional communication system includes:

a first transceiver located in said first hearing element and a second transceiver located in said second hearing element, said first transceiver and said second transceiver for converting said analog input signals to first electromagnetic signals, for transmitting said first electromagnetic signals, and for receiving a second electromagnetic signal; and

a third transceiver located in said first unit, for receiving said first electromagnetic signals transmitted from said first transceiver and said second transceiver, for converting said first electromagnetic signals to said analog input signal, for converting said analog binaural output signals to said second electromagnetic signals, and for transmitting said second electromagnetic signals.

17. The hearing aid of claim 13, wherein said bidirectional communication system includes:

a first transceiver located in said first hearing element and a second transceiver located in said second hearing element, said first transceiver and said second transceiver for converting said first digital signals to first electromagnetic signals, for transmitting said first electromagnetic signals, and for receiving a second electromagnetic signal; and

a third transceiver located in said first unit, for receiving said first electromagnetic signals transmitted from said first transceiver and said second transceiver, for converting said first electromagnetic signals to said first digital signals, for converting said digital binaural output signals to said second electromagnetic signals, and for transmitting said second electromagnetic signals.

18. A hearing aid system comprising:

a hearing element, including;

a first audio microphone, positioned adjacent to one ear of a user, for receiving an audio signal and for converting said audio signal to an analog input signal,

a first analog processing system, coupled to said first audio microphone, for performing an analog processing technique on said analog input signal when a first binaural digital processor is not utilized, and

a first audio receiver, for converting an analog output signal to a filtered audio signal to be transmitted into one of the ears of said user;

a detachable first unit having;

a power supply,

a first analog-to-digital converter for converting said analog input signals to a first digital signal,

said first binaural digital processor, disposed to receive said first digital signal, for selectably performing a binaural digital processing technique on said first digital signal and generating a binaural digital output signal, and

a first digital-to-analog converter for converting said binaural digital output signal to a binaural analog output signal; and

a bidirectional communication system for coupling said first hearing element and said first unit, said first binaural digital processor performing a monaural processing technique when said bidirectional communication system is not operational.

19. The hearing aid system of claim 18, further comprising:

a first transceiver located in said first hearing element, for converting said first digital signal to a first electromagnetic signal, for transmitting said first electromagnetic signal, and for receiving a second electromagnetic signal; and

a second transceiver located in said first unit, for receiving said first electromagnetic signal, for converting said first electromagnetic signal to said first digital signal, for converting said binaural digital output signal to said second electromagnetic signals, and for transmitting said second electromagnetic signals.

20. The hearing aid of claim 18, wherein said bidirectional communication system includes a wire, coupled between said first hearing element and said detachable first unit.

21. A hearing aid comprising:

a first hearing element, including;

a first audio microphone positioned adjacent to one ear of a user, for receiving a first set of audio signals and for converting said first set of audio signals to a first analog input signal;

a first analog-to-digital converter, for converting said first analog input signal to a first digital signal;

a first binaural digital processor, disposed to receive said first digital signal and a second digital signal, for selectably performing a binaural processing technique on said first and second digital signals and generating first and second digital binaural output signals;

a first digital-to-analog converter, for converting said first digital binaural output signal to a first analog binaural output signal; and

a first audio receiver disposed to receive said first analog binaural output signal, for converting said first analog binaural output signal to a first filtered audio signal to be transmitted into one of the ears of said user;

a second hearing element, including;

a second audio microphone positioned adjacent to one ear of a user, for receiving a second set of audio signals and for converting said second set of audio signals to a second analog input signal;

a second analog-to-digital converter, for converting said second analog input signal to the second digital signal;

a second digital-to-analog converter, for converting said second digital binaural output signal to a second analog binaural output signal;

a second audio receiver disposed to receive said second analog binaural output signal, for converting said second analog binaural output signal to a second filtered audio signal to be transmitted into one of the ears of said user; and

a power supply coupled to said first binaural digital processor; and

a bidirectional communication system, for providing said second digital signal to said first binaural digital processor.