| 主权项 |
1. A method to monitor a media device, comprising:
attempting, by executing a first instruction with a processor, to detect a logical transition between two sequential bits in a sequence of bits of a digital audio signal output by a port of the media device, the digital audio signal being encoded via differential encoding; and when the logical transition is detected, generating operating state data by executing a second instruction with the processor, the operating state data including a first time and indicating that the media device was in an on state at the first time; or when the logical transition is not detected, generating the operating state data by executing a third instruction with the processor, the operating state data including the first time and indicating that the media device was in an off state at the first time. |
