According to the table 1-1 in ITU-R BT.470-6, the line-blanking interval of PAL B/D/H/I/K/L should be 12us:
But when I measure the output of ADV7390, I found that it is about 10us. I have config ADV7390 by using the scripts in table 82. I think this is correct for ADV7390 when the input is set to BT656, because according to figure 104 in datasheet, the line-blanking interval should be 288 clock ( frequency is 27MHz and period is 37.037ns) , that is 288 x 37.037 = 10.6us.
But it is not conform to th BT470, and have ariased problems in some monitors （ most monitor is OK). How can I changed the line blanking interval to 12us?
Thank you for your quick reply. I have check that thread but it is not my case. The input clock of ADV7390 in my system is 27MHz. I searched in the datasheet and found that bit3 of Reg#0x84(SD active video length) can solve this problem. When setting active pixel to 702 pixel by enable this bit, the line-blanking interval is exactly 12us now. But I worry that the angle of view will be incorrect because the camera output 720 pixel and ADV7390 discard 18 of them. Should I add a scaler before AD7390 to scale 720 pixel down to 702 pixel? Could you explain this bit in detail ? For example, how it is implement, discard pixel or scale-down in AD7390? In what circumstance I should enable it, and if it is enable , any other reigster should be changed? and so on. Thanks in advance.