Hearing aid system with lost partner functionality

1. A hearing aid system comprising a first hearing aid and an external device, each having:

a short range communications component for establishing a short-range wireless link between the first hearing aid and the external device;

a monitor component to monitor whether the link is active; and

an alert component to issue an alert based on the detection of no traffic at the link within a defined second period of time, following a first period of time with monitored active traffic on the link, said alert component making an activity determination when said monitor component indicates that said link has been active for a first period of time, and being responsive to said activity determination to issue said alert when said monitor component indicates that said link has been inactive for said second period of time;

wherein the alert component comprises: a first counter to count the clock cycles elapsed since the onset of traffic, a first comparator adapted to delay the start of active link detection until a first predetermined count is reached; a watchdog timer comprising a second counter adapted to count the clock cycles elapsed since the tripping by the first comparator, the watchdog timer having a second comparator to determine if a second predetermined count is reached; and alarm logic for issuing an alert when the second comparator indicates that the second predetermined count has been reached by the second counter.

2. The system according to claim 1 , wherein said first hearing aid has a self-test component for conducting a self-test and a transmitter for sending a message on the link to said external device about the result of the self-test.

3. The system according to claim 1 , wherein the alert component is adapted to issue an audible message or tone.

4. The system according to claim 1 , wherein the alert component comprises a visual indicator.

5. The system according to claim 1 , wherein the external device is a remote control.

6. The system according to claim 1 , wherein said external device comprises a second hearing aid.

7. A method for notifying a user of a defect or error in a hearing aid system, comprising establishing a link for short range wireless connection between a first hearing aid and an external device, monitoring whether the link is active by, at each of said first hearing aid and external device:

starting a first counter once traffic has commenced; said first counter to count the clock cycles elapsed since the onset of traffic, adapting a first comparator to delay the start of active link detection until a first predetermined count is reached;

if the connection is not active, and the first counter has reached a first predetermined count, initiating a second counter; said second counter being part of a watchdog timer and adapted to count the clock cycles elapsed since the tripping by the first comparator; the watchdog timer having a second comparator to determine if a second predetermined count is reached;

if the connection is reestablished, resetting the second counter;

if the second counter reaches a second predetermined count, issuing an alert in at least said first hearing aid.

8. The method according to claim 7 , wherein the alert is selected from a group consisting of a spoken message, a visual indicator, and a message sent to an external unit.

9. The method according to claim 7 , wherein said external device comprises a remote control.

10. The method according to claim 7 , wherein said external device comprises a second hearing aid.