Originally Posted by dr1394
Thers no "real" blanking in SDI
..Lot's of data in the blanking.
According to my reference the Blanking Level is clearly defined and it's NOT any 8-bit decimal code word between (1-254) like you seem to have impliedhttp://en.wikipedia.org/wiki/Serial_Digital_Interface
For SDI portions of the vertical and horizontal blanking regions which are NOT used for ancillary data, it is recommended that the luma samples be assigned the code word 16 (decimal), and the chroma samples be assigned 128 per 8-bit payload; both of which correspond to 0 mV.
In other words Michael Robin is correct again in that the Blanking level for ITU-R 601 or 709 is defined as the YCbCr code words for 0 mV.http://broadcastengineering.com/mag/...r_bars_puzzle/
“Color bars signals are identified with four numbers, representing percentages of the maximum value of 700 mV (100 percent), with an oblique stroke between them as follows:”
“These signals may be used in their original form (component analog GBR signals), matrixed into E´Y, E´B-E´Y and E´R-E´Y (scaled or non-scaled), or encoded into an analog (PAL, NTSC or SECAM) or digital (component or composite) signal
“Table 11.9 shows the calculated signal amplitudes for individual steps corresponding to the three primary colors (green, blue and red) and their complements (yellow, cyan and magenta) of the 100/0/100/0
color bars signal with reference to (Table 11.8) ITU-R BT.601 Coded Signal Standard and the component signal “levels in mV” for ITU-R BT.601 E’Y, E’CB, E’CR components”
Note Table 11.9 on page 508,(0-700mV) Black-White 100% Color Bar Component Signal Level in “mV” for ITU-R 601 and 709.