Patent ID: 7236531

Claim:
A multichannel display data generating apparatus for generating data for displaying AV data of plurality of channels on a multiscreen comprising a main screen for displaying the video of AV data the voice of which is output to a main speaker and a subsidiary screen for displaying the video of AV data the voice of which is not output to a main speaker, said apparatus comprising: input means for inputting AV data of a plurality of channels being transferred using a transport packet of a transport stream; PCR extracting means for extracting a PCR of the channel displayed on said main screen among said plurality of channels; PLL means for establishing PLL synchronization by using said extracted PCR; STC counter means for counting the time of the channel displayed on said main screen by using the oscillation frequency of said PLL means; AV decoding means for AV-decoding the AV data of the channel displayed on said main screen in AV synchronization with said STC counter means and for AV-decoding the AV data of the channel displayed on said subsidiary screen out of AV synchronization; and output means for outputting said AV-decoded AV data; and wherein said output AV data is displayed on said multiscreen, wherein the channel displayed on said subsidiary screen is displayed without a PCR which is used to synchronize a) audio for the channel displayed on said subsidiary screen, to b) video for the channel displayed on said subsidiary screen.