Determining Device State Using a State-Detection Circuit

摘要

An audio/video (A/V) hub includes a state-detection circuit coupled to at least one pin in a high-definition multimedia-interface input connector, which can electrically couple to an entertainment device. When electrically coupled to the entertainment device, the state-detection circuit establishes a ground loop between the electronic device and the entertainment device. A control circuit in the A/V hub detects whether there is electrical coupling with the entertainment device using the state-detection circuit. When the electrical coupling is detected, the control circuit provides a set of first control commands associated with different types of entertainment devices until, in response, content activity is detected via the input connector. Moreover, when the content activity is detected, the control circuit provides a set of second control commands associated with different providers of entertainment devices until a change in a state of the entertainment device is detected via the input connector and the state-detection circuit.

主权项

1. An audio/video (A/V) hub, comprising:
an input connector that electrically couples to an entertainment device, wherein the input connector is compatible with a high-definition multimedia-interface (HDMI) standard; a state-detection circuit coupled to at least one pin in the input connector, wherein, when the entertainment device is electrically coupled to the input connector, the state-detection circuit establishes a ground loop between the electronic device and the entertainment device; and a control circuit electrically coupled to the input connector, configured to:
detect whether there is electrical coupling between the entertainment device and the input connector using the state-detection circuit;when the electrical coupling is detected, provide a set of first control commands associated with different types of entertainment devices until, in response, content activity is detected via the input connector; andwhen the content activity is detected, provide a set of second control commands associated with different providers of entertainment devices until a change in a state of the entertainment device is detected via the input connector and the state-detection circuit.