Systems and methods for reducing electromagnetic radiation emitted from a wireless headset

1. A system comprising:

a mobile device comprising a transmission module for transmitting data or voice signals over a microwave frequency band; and

a wireless headset comprising:

a transceiver that enables the wireless headset to wirelessly communicate with the mobile device during a time when the mobile device and wireless headset are linked within a personal area network (PAN), the wireless headset configured to receive instructions from the mobile device to enter a sleep mode, the transceiver being turned off during the sleep mode; and

a microphone configured to receive an audio signal from the mobile device, the audio signal being a wake-up signal from the mobile device when the transceiver is turned off.

2. The system of claim 1 , wherein the wireless headset further comprises match detecting circuitry configured to determine whether the received audio signal matches a predetermined audio file.

3. The system of claim 2 , wherein the predetermined audio file includes audio signals of a ringtone of the mobile device.

4. The system of claim 2 , wherein the wireless headset further comprises recording circuitry configured to record audio from the mobile device and store an audio file of the recorded audio.

5. The system of claim 1 , wherein:

the mobile device comprises a light emitter configured to emit a light signal indicating a command to the wireless headset to awaken from the sleep mode; and

the wireless headset comprises a light sensor configured to sense the emitted light signal.

6. The system of claim 5 , wherein the wireless headset further comprises light analyzing circuitry configured to determine when sensed light signals are valid light signals emitted by the light emitter of the mobile device.

7. A method of enabling a sleep mode for a wireless headset, the method comprising:

receiving instructions from a master device to enter a sleep mode;

in response to receiving instructions to enter the sleep mode, turning off a transceiver of the wireless headset, the transceiver being configured to enable wireless short-range communication between the wireless headset and the master device;

listening for an audio signal from the master device; and

in response to receiving a valid audio signal from the master device, turning on the transceiver of the wireless headset.

8. The method of claim 7 , further comprising determining whether the received audio signal matches a pre-recorded audio file.

9. The method of claim 8 , wherein the pre-recorded audio file is a recording of an audio output from the master device.

10. The method of claim 8 , wherein the pre-recorded audio file is a recording of a voice command from a user of the wireless headset.

11. The method of claim 7 , further comprising waiting for a light signal from the master device.

12. The method of claim 11 , further comprising determining whether a detected light signal is a valid light signal from the master device.

13. The method of claim 11 , wherein the light signal is an infrared signal.

14. The method of claim 7 , wherein the master device is a mobile phone device.

15. A wireless headset comprising:

a transceiver configured to wirelessly communicate with a mobile device during a time when the mobile device and wireless headset are linked within a personal area network (PAN), wherein, when the wireless headset is inactive, the transceiver is configured to receive instructions from the mobile device to enter a sleep mode;

switching circuitry configured to turn off the transceiver during the sleep mode;

a microphone configured to receive an audio signal from the mobile device, the audio signal being a wake-up signal from the mobile device when the transceiver is turned off;

wherein the switching circuitry is configured to turn the transceiver on when the wake-up signal is received.

16. The wireless headset of claim 15 , wherein the mobile device is a mobile phone and the audio signal is a ringtone of the mobile phone indicating an incoming call.

17. The wireless headset of claim 15 , further comprising circuitry to compare the received audio signal with a pre-recorded audio file.

18. The wireless headset of claim 17 , further comprising circuitry to record audio from the mobile device and store the audio as the audio file.

19. The wireless headset of claim 15 , further comprising a light sensor for sensing light emitted from the mobile device, the light signal being the wake-up signal from the mobile device when the transceiver is turned off.

20. The wireless headset of claim 19 , wherein the light sensor is an infrared sensor and the light emitted from the mobile device is infrared light.