Adaptive ring signal level device and method

1. A method for generating an adaptive ring signal level in a mobile communication device in response to a surrounding environmental condition of said mobile

communication device, the method comprising the steps of,

emitting a reference pulse signal from a loudspeaker,

recording a pulse response of said emitted signal at a microphone and storing it in a memory means

determining a transfer function based on the relation between the emitted signal and the recorded response,

comparing said transfer function with an ideal transfer function, stored in the memory means and which has been obtained under controlled and predetermined conditions,

calculating the difference between the determined transfer function and the ideal transfer function and storing it in the memory means as a response function,

comparing the calculated response function with predefined response functions stored in a look up table,

selecting the predefined response function that has the closest match with the calculated response function, and

adjusting the ring signal to a level that corresponds to the values associated with and stored together with the selected predefined response function.

2. The method according to claim 1 , wherein the mobile communication device comprises a camera and the method further comprises the steps of,

collecting information about the ambient light conditions with the camera, and

comparing the calculated response function first with the predefined response functions having the same light conditions as the collected information.

3. The method according to claim 1 , wherein the mobile communication device comprises a light sensor and the method further comprises the steps of,

collecting information about the ambient light conditions with the light sensor, and

comparing the calculated response function first with the predefined response functions having the same light conditions as the collected information.

4. The method according to claim 1 , wherein the emitted reference pulse signal is emitted periodically during the time when the mobile communication device is waiting for receiving a call and continuously during the time when the ring signal is ringing and the incoming call has not yet been answered.

5. The method according to claim 1 , wherein the emitted reference pulse signal is the ring signal itself.

6. A computer program comprising code means for performing the steps of claim 1 , when the program is run on a processing logic.

7. A computer program product comprising program code means stored on a computer readable medium for performing the method of claim 1 , when said product is run on a processing logic.

8. A mobile communication device capable of generating an adaptive ring signal level in response to the surrounding environmental condition, comprising a loudspeaker, a microphone, processing logic and memory means, where the processing logic of the mobile communication device is configured to execute the following steps,

emitting a reference pulse signal from the loudspeaker,

recording a pulse response of said emitted signal at the microphone and storing it in the memory means

determining a transfer function based on the relation between the emitted signal and the recorded response,

comparing said transfer function with an ideal transfer function, stored in the memory means and which has been obtained under controlled and predetermined conditions,

calculating the difference between the determined transfer function and the ideal transfer function and storing it in the memory means as a response function,

comparing the calculated response function with predefined response functions stored in a look up table,

selecting the predefined response function that has the closest match with the calculated response function, and

adjusting the ring signal to a level that corresponds to the values associated with and stored together with the selected predefined response function.

9. The mobile communication device according to claim 8 , wherein the mobile communication device furthermore comprises a camera and the processing logic is configured to carry out the further steps of,

collecting information about the ambient light conditions with the camera, and

comparing the calculated response function first with the predefined response functions having the same light conditions as the collected information.

10. The mobile communication device according to claim 8 , wherein the mobile communication device furthermore comprises a light sensor and the processing logic is configured to carry out the further steps of,

collecting information about the ambient light conditions with the camera, and

comparing the calculated response function first with the predefined response functions having the same light conditions as the collected information.

11. The mobile communication device according to claim 8 , wherein the mobile communication device is configured to emit the reference pulse signal periodically during the time when the mobile communication device is waiting for receiving a call and continuously during the time when the ring signal is ringing and the incoming call has not yet been answered.

12. The mobile communication device according to claim 8 , wherein the emitted reference pulse signal is the ring signal itself.