Mobile communication devices having adaptable features and methods for implementation

1. A device comprising:

circuitry configured to:

periodically provide a test signal to an adaptable speaker system to determine resonance frequencies of the adaptable speaker system;

measure a current draw of the adaptable speaker system over a period of time;

determine a complex impedance of the adaptable speaker system based on the measured current draw over the period of time; and

dynamically adjust an output to the adaptable speaker system based on the determined complex impedance and the determined resonance frequencies,

wherein the circuitry lowers the output to the adaptable speaker system when the determined complex impedance indicates that the adaptable speaker system approaches a resonance event.

2. The device of claim 1 , wherein the circuitry is further configured to dynamically adjust the output to mitigate damage to the adaptable speaker system, the damage being related to the resonance event, and the output being a drive signal for the adaptable speaker system.

3. The device of claim 1 , wherein the circuitry is further configured to dynamically adjust the output to mitigate damage to the adaptable speaker system, the damage being related to the resonance event, and the output being a power level for driving the adaptable speaker system.

4. The device of claim 1 , wherein the circuitry is configured to detect distortion produced by the adaptable speaker system, the detected distortion being unrelated to the resonance event.

5. The device of claim 4 , wherein the circuitry is configured to determine a filter to apply to the output, in order to reduce the detected distortion.

6. The device of claim 5 , wherein the filter is a specific frequency dependent digital audio filter.

7. The device of claim 1 , wherein the circuitry is configured to:

determine a desired state for the adaptable speaker system; and

dynamically adjust the output to obtain the desired state for the adaptable speaker system.

8. The device of claim 1 , wherein the circuitry is configured to measure amplitudes of one or more frequency components of the current draw, and to measure relative phases of the one or more frequency components of the current draw.

9. The device of claim 8 , wherein the circuitry is configured to determine whether the adaptable speaker system produces distortion at the one or more frequency components, based on the measured amplitudes and the measured relative phases.

10. The device of claim 1 , wherein the circuitry comprises:

an analog current meter connected to an analog-to-digital converted included in the adaptable speaker system, the analog current meter configured to measure the current draw of the adaptable speaker system.

11. The device of claim 1 , wherein the circuitry comprises:

a memory configured to store information indicating a pre-determined, frequency dependent power profile for the adaptable speaker system.

12. The device of claim 11 , wherein the circuitry is configured to dynamically adjust the output to the adaptable speaker system based on the determined complex impedance and the pre-determined, frequency dependent power profile stored in the memory.

13. The device of claim 1 , wherein device is a mobile telephone device or a headset device.

14. The device of claim 1 , further comprising:

the adaptable speaker system that includes at least one speaker, the at least one speaker being configured to:

produce a speaker output; and

receive an echo produced by an interaction of the speaker output with an object, wherein

the circuitry is configured to determine a proximity of the object with respect to the device, based on the received echo.

15. The device of claim 14 , wherein

the speaker output includes a test signal; and

the circuitry is configured to measure the received echo in relation to the test signal, and to determine the proximity of the object based on the measurement.

16. The device of claim 14 , wherein the circuitry is configured to:

measure the received echo in relation to the produced speaker output; and

determine the proximity of the object based on the measurement.

17. The device of claim 14 , wherein the circuitry is configured to apply an operating state to the device based on the proximity of the object.

18. The device of claim 1 , wherein the resonance event is based on an environmental coupling of the adaptable speaker, and the circuitry is further configured to adjust the determined complex impedance based on variations in the resonance event due to the environmental coupling and to dynamically adjust the output based on the adjusted complex impedance.

19. The device of claim 1 , wherein the circuitry is configured to provide the test signal to the speaker system at regular intervals.

20. A method performed by an electronic device, the method comprising:

periodically providing a test signal to an adaptable speaker system to determine resonance frequencies of the adaptable speaker system;

measuring a current draw of the adaptable speaker system over a period of time;

determining a complex impedance of the adaptable speaker system based on the measured current draw over the period of time; and

dynamically adjusting an output to the adaptable speaker system based on the determined complex impedance and the determined resonance frequencies, and

wherein the output to the adaptable speaker system is lowered when the determined complex impedance indicates that the adaptable speaker system approaches a resonance event.