User voice detector device and method using in-ear microphone signal of occluded ear

1. A method for detecting voice of a user of an intra-aural device, the intra-aural device having an in-ear microphone adapted to be in fluid communication with an outer-ear ear canal of the user occluded from an environment outside the ear by the intra-aural device, the method comprising the steps of:

obtaining a signal provided by the in-ear microphone, the signal being influenced by an occlusion effect within the occluded outer-ear ear canal caused by bone and tissue conducted vibrations from the user, thereby distorting an in-ear frequency profile of the signal relative to an open-air voice signal;

processing the signal provided by the in-ear microphone to determine an acquired voice indicator signal, and to filter the signal over a predetermined frequency range to isolate the user's voice from the distorted in-ear frequency profile while accounting for wearer-induced disturbances specific to the intra-aural device; and

detecting voice produced by the user by comparing the acquired voice indicator signal with a corresponding threshold value, upon the acquired voice indicator signal being larger than the corresponding threshold value, and wherein the processing and detecting steps reduce any voice interference coming from a non-user by controlling the distorted in-ear frequency profile enhanced by the occlusion effect relative to an external noise.

2. The method of claim 1 , wherein the acquired voice indicator signal is an in-ear microphone voice indicator signal (IVIS) and the corresponding threshold value is an in-ear microphone threshold value (ITV).

3. The method of claim 2 , wherein the step of processing includes processing the signal provided by the in-ear microphone using a voice detector algorithm to determine the acquired voice indicator signal.

4. The method of claim 2 , wherein the step of obtaining includes the step of:

averaging the in-ear microphone voice indicator signal (IVIS) over a predetermined time period.

5. The method of claim 1 , wherein the intra-aural device has an outer-ear microphone adapted to be in fluid communication with the environment outside the ear, the method further comprising the step of processing a signal provided by the outer-ear microphone; and wherein the acquired voice indicator signal is a ratio of an in-ear microphone voice indicator signal (IVIS) over an outer-ear microphone voice indicator signal (OVIS), and the corresponding threshold value is a ratio threshold value (RTV), upon the outer-ear microphone voice indicator signal (OVIS) being larger than a predetermined floor level (PFL), and wherein the step of detecting voice produced by the user further removes any voice interference coming from a non-user.

6. The method of claim 5 , wherein the step of processing a signal provided by the outer-ear microphone includes processing the signal provided by the inner-ear microphone and a signal provided by the outer-ear microphone using a voice detector algorithm to determine the acquired voice indicator signal.

7. The method of claim 5 , wherein the step of obtaining includes the step of:

averaging the in-ear microphone voice indicator signal (IVIS) and the outer-ear microphone voice indicator signal (OVIS) over a predetermined time period.

8. The method of claim 5 , wherein the step of processing includes filtering the signal provided by the in-ear microphone and the signal provided by the outer-ear microphone over a predetermined frequency range.

9. A voice detector device for detecting voice of a user of an intra-aural device, the voice detector device comprising:

an in-ear microphone adapted to be in fluid communication with an outer ear canal of an ear of the user occluded from an environment outside the ear; and

a processing unit operatively connected to the in-ear microphone to receive an internal signal therefrom, the processing unit being configured so as to:

execute the method of claim 1 for detecting voice of the user of the intra-aural device.

10. A voice detector device for detecting voice of a user of an intra-aural device, the voice detector device comprising:

an in-ear microphone adapted to be in fluid communication with an outer ear canal of an ear of the user occluded from an environment outside the ear;

an outer-ear microphone adapted to be in fluid communication with the environment outside the ear; and

a processing unit operatively connected to the in-ear microphone and the outer-ear microphone to receive an internal signal and an external signal therefrom, respectively, the processing unit being configured so as to:

further execute the method of claim 6 for detecting voice of the user of the intra-aural device.