Hearing aid with occlusion reduction

1. A hearing aid, comprising:

an occlusion reduction system having a tuned resonator;

a hearing aid housing having a rear end and a front end;

a vent, extending from the rear end of the hearing aid housing to the front end of the hearing aid housing, said vent having a first end facing outside the ear and a second end facing the ear canal; and

a tuned piston and a flexible surround combination covering said vent, the tuned piston and the flexible surround combination forming the tuned resonator.

2. The hearing aid of claim 1 , wherein the occlusion reduction system comprises active occlusion reduction circuitry and a ventilation channel extending through the housing of the hearing aid along its length, said vent having the tuned resonator located at the one end of the ventilation channel that faces away from the user.

3. The hearing aid of claim 2 , wherein the tuned resonator is shaped and sized to entirely cover the one end of the ventilation channel.

4. The hearing aid of claim 1 , wherein the tuned resonator is tuned to a resonance frequency between approximately 10 and 100 Hz.

5. The hearing aid of claim 1 , wherein the tuned resonator is tuned to a resonance frequency of approximately 30 Hz.

6. The hearing aid of claim 1 , wherein the tuned resonator is tuned to a resonance frequency that minimizes distortions in the frequency response of the hearing aid caused by walk-induced head vibrations.

7. A hearing aid, comprising:

a. an external microphone that converts ambient sounds originating outside the ear into first representative electrical signals;

b. an internal microphone that converts sounds originating inside the ear canal, including at least occlusion sounds, into second representative electrical signals;

c. a signal processing system operatively coupled between the external microphone and the internal microphone that modifies and combines the first and second electrical signals to generate third representative electrical signals;

d. a receiver that converts the third representative electrical signals into hearing-loss compensating sounds and occlusion-negating sounds and projects the hearing-loss compensating sounds and occlusion-negating sounds into the ear canal;

e. a vent, extending from the rear of the hearing aid housing to the front of the hearing aid housing, having a first end facing outside the ear and a second end facing the ear canal; and

f. a tuned piston and a flexible surround combination that is situated at the front of the hearing aid housing and that covers the first end of the vent.

8. The hearing aid of claim 7 , wherein the tuned piston and the flexible surround combination is shaped and sized to completely cover the first end of the vent.

9. The hearing aid of claim 7 , wherein the tuned piston is formed as a rigid disk and the flexible surround is formed as an elastic membrane that extends from the disk to either the housing or to the inside surface of the first end of the vent, said disk being suspended across the first end of the vent by the membrane.

10. The hearing aid of claim 9 , wherein the rigid disk is attached along its entire perimeter to the membrane and the membrane is attached along its entire outer perimeter to either the housing or to the inside surface of the first end of the vent.

11. The hearing aid of claim 9 , wherein the disk is formed with a diameter in the range of approximately 1-3 mm.

12. The hearing aid of claim 7 , wherein the tuned piston and the flexible surround combination form a resonator.

13. The hearing aid of claim 12 , wherein the resonator is tuned to a resonance frequency between approximately 10 and 100 Hz.

14. The hearing aid of claim 12 , wherein the tuned resonator is tuned to a resonance frequency that counteracts a portion of the sound pressure inside the residual volume of the occluded ear canal caused by walk-induced head vibrations.