Patent ID: 8001289

Claim:
A digital AV apparatus comprising: an AV decoder which outputs decoded video and decoded audio data; a first controller to control an AV decoding operation; a scaler to selectively adjust resolutions of decoded video data output from the AV decoder and additional information video data provided from an external video source and to output resolution-adjusted video data and resolution-adjusted additional information video data; an audio processor to selectively process decoded audio data output from the AV decoder and additional information audio data provided from an external audio source; and a second controller to receive a command provided from an external controller and to control the selection operation of the scaler and the audio processor based on the command, wherein the second controller acts as a master to control the scaler and the audio processor, and the second controller acts as a slave to the first controller during an AV decoding operation and to the external controller when receiving the command, and wherein the master is defined as a device that starts a data transmission on a bus and generates a clock signal for data transmission and the slave is defined as a device that is a data transmission destination.