Patent ID: 6940560

Claim:
A system for performing combing for PAL luma data for a display having a plurality of lines, the display capable of depicting a frame including a horizontal boundary having a top edge and a bottom edge, a top line of the plurality of lines at the top edge of the horizontal boundary, a bottom line of the plurality of lines at the bottom edge of the horizontal boundary, the system comprising: a feedback means having a first input, a second input and a first output, the first input receiving luma data for a current line; a line delay having a delay input and a delay output, the delay input coupled with the first output, the delay output coupled with the second input; a feed forward means having a third input, a fourth input and a second output, the third input coupled with the delay output, the fourth input receiving the luma data for the current line, the feedback means being controlled to provide fedback luma data from the second input to the first output when the current line is the top line and to provide the luma data for the current line from the first input to the first output otherwise, the feed forward means being controlled to provide next line luma data from the fourth input to the second output when the current line is the bottom line and to provide the luma data from the current line to the second output otherwise.