Patent ID: 7512962

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 configured to input AV data of a plurality of channels being transferred using a transport packet of a transport stream; the same number of PCR extracting means which are configured to extract the PCR of the channels displayed on said main screen and said subsidiary screen among said plurality of channels as the number of screens of said multiscreen; one PLL means configured to establish PLL synchronization with the channel displayed on said main screen by using said extracted PCR; the same number of STC counter means which are configured to count the times of the channels displayed on said main screen and said subsidiary screen by using the oscillation frequency of said PLL means as the number of screens of said multiscreen; AV decoding means configured to AV-decode the AV data of the channels displayed on said main screen and said subsidiary 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 configured to output said AV-decoded AV data; and wherein said output AV data is displayed on said multiscreen, and 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.