Methods and apparatus to meter video game play

1. A method comprising:

detecting media identifying information corresponding to media presented in an environment including a video game system capable of executing a plurality of video games;

identifying which of the plurality of video games is being played via a video game controller based on the media identifying information, wherein the video game controller is coupled to a sensor to detect motion data related to movement of the video game controller and to transmit the motion data without affecting operation of the video game system; and

combining, via a processor, the media identifying information with the motion data received from the sensor.

2. A method as defined in claim 1 , further comprising causing the sensor to periodically transmit the motion data.

3. A method as defined in claim 1 , wherein detecting the media identifying information comprises capturing an audio signal associated with the video game system.

4. A method as defined in claim 3 , wherein detecting the media identifying information comprises collecting an embedded code in the audio signal.

5. A method as defined in claim 3 , wherein detecting the media identifying information comprises detecting a signature in the audio signal.

6. A method as defined in claim 1 , further comprising detecting a presence of a user in the environment.

7. A method as defined in claim 6 , further comprising combining presence data corresponding to detecting of the presence with the media identifying information and the motion data.

8. A method as defined in claim 1 , wherein combining the media identifying information and the motion data comprises associating the media identifying information with a message including the motion data to be conveyed to a metering entity.

9. A tangible machine readable storage medium comprising instructions that, when executed, cause a machine to at least:

detect media identifying information corresponding to media presented in an environment including a video game system capable of executing a plurality of video games;

identify which of the plurality of video games is being played via a video game controller based on the media identifying information, wherein the video game controller is coupled to a sensor to detect motion data related to movement of the video game controller and to transmit the motion data without affecting operation of the video game system; and

combine the media identifying information with the motion data received from the sensor.

10. A storage medium as defined in claim 9 , wherein the instructions cause the machine to trigger the sensor to periodically transmit the motion data.

11. A storage medium as defined in claim 9 , wherein the instructions cause the machine to detect the media identifying information by capturing an audio signal associated with the video game system.

12. A storage medium as defined in claim 11 , wherein the instructions cause the machine to detect the media identifying information by collecting an embedded code in the audio signal.

13. A storage medium as defined in claim 11 , wherein the instructions cause the machine to detect the media identifying information by detecting a signature in the audio signal.

14. A storage medium as defined in claim 9 , wherein the instructions cause the machine to detect a presence of a user in the environment.

15. A storage medium as defined in claim 14 , wherein the instructions cause the machine to combine presence data representing the detected presence with the media identifying information and the motion data.

16. A storage medium as defined in claim 9 , wherein the instructions cause the machine to combine the media identifying information and the motion data by associating the media identifying information with a message including the motion data to be conveyed to a metering entity.

17. An apparatus comprising:

a sensor structured to be attached to a video game controller, the sensor structured to be attached external to a housing of the video game controller, the sensor structured to detect a user interaction with the video game controller;

a processor structured to execute instructions to:

compare a magnitude of a motion of the video game controller detected by the sensor to a threshold; and

attribute the motion to video game play if the magnitude of the motion detected by the sensor exceeds the threshold; and

a transmitter structured to convey a signal representative of the detected user interaction to a meter without affecting operation of a video game system to be controlled by the video game controller.

18. An apparatus as defined in claim 17 , wherein the processor, when executing instructions, is structured to attribute the motion to non-video game play if the magnitude is less than the threshold.

19. An apparatus as defined in claim 17 , wherein the processor, when executing instructions, is structured to associate the user interaction with an identifier assigned to the sensor.

20. An apparatus as defined in claim 17 , further comprising a filter structured to determine if the motion corresponds to haptic feedback implemented by the video game controller.

21. An apparatus as defined in claim 20 , wherein the haptic feedback is provided in response to an aspect of a video game being played via the video game controller.

22. An apparatus as defined in claim 17 , wherein the sensor is carried by an annular housing removably attachable to a wire of the video game controller.