Patent ID: 8090884

Claim:
An audio/video (A/V) system capable of controlling an external device as a source of audio and/or video output of the A/V system, said A/V system comprising: an interface unit that transmits/receives control information to/from the external device and receives decoded digital multimedia data from the external device; a digital-to-analog (D/A) conversion unit that converts the received decoded digital multimedia data into an analog audio and/or video signal; and a control unit that controls the interface unit and the D/A conversion unit such that the received decoded digital multimedia data is converted into the analog signal as audio and/or video output of the A/V system; wherein the control information transmitted to the external device includes information on a multimedia file as requested from the A/V system and an operation command for controlling an operation on the requested multimedia file; wherein the control information transmitted from the external device includes information on an operational state associated with the operation; and wherein the external device decodes the requested multimedia file in accordance with the operation command to generate the decoded digital multimedia data.