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ADV7191 Datasheet(PDF) 41 Page - Analog Devices |
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ADV7191 Datasheet(HTML) 41 Page - Analog Devices |
41 / 72 page REV. B ADV7190/ADV7191 –41– DNR2 BIT DESCRIPTION DNR Input Select (DNR20–DNR22) Three bits are assigned to select the filter that is applied to the incoming Y data. The signal that lies in the passband of the selected filter is the signal that will be DNR processed. Figure 81 shows the filter responses selectable with this control. FREQUENCY – MHz 1 0.4 0.6 0.2 01 234 6 5 0.8 0 FILTER D FILTER C FILTER A FILTER B Figure 81. Filter Response of Filters Selectable DNR Mode Control (DNR23) This bit controls the DNR mode selected. A Logic 0 selects DNR mode, a Logic 1 selects DNR Sharpness mode. DNR works on the principle of defining low amplitude, high- frequency signals as probable noise and subtracting this noise from the original signal. In DNR mode, it is possible to subtract a fraction of the signal that lies below the set threshold, assumed to be noise, from the original signal. The threshold is set in DNR Register 1. When DNR Sharpness mode is enabled it is possible to add a fraction of the signal that lies above the set threshold to the original signal, since this data is assumed to be valid data and not noise. The overall effect being that the signal will be boosted (similar to using Extended SSAF Filter). FILTER OUTPUT < THRESHOLD ? GAIN CONTROL BLOCK SIZE CONTROL BORDER AREA BLOCK OFFSET GAIN CORING GAIN DATA CORING GAIN BORDER FILTER BLOCK FILTER OUTPUT > THRESHOLD DNR OUT MAIN SIGNAL PATH Y DATA INPUT NOISE SIGNAL PATH SUBTRACT SIGNAL IN THRESHOLD RANGE FROM ORIGINAL SIGNAL DNR MODE FILTER OUTPUT > THRESHOLD ? GAIN CONTROL BLOCK SIZE CONTROL BORDER AREA BLOCK OFFSET GAIN CORING GAIN DATA CORING GAIN BORDER FILTER BLOCK FILTER OUTPUT < THRESHOLD DNR OUT MAIN SIGNAL PATH Y DATA INPUT NOISE SIGNAL PATH ADD SIGNAL ABOVE THRESHOLD RANGE TO ORIGINAL SIGNAL DNR SHARPNESS MODE Figure 82. Block Diagram for DNR Mode and DNR Sharp- ness Mode Block Offset (DNR24–DNR27) Four bits are assigned to this control which allows a shift of the data block of 15 pixels maximum. Consider the coring gain posi- tions fixed. The block offset shifts the data in steps of one pixel such that the border coring gain factors can be applied at the same position regardless of variations in input timing of the data. O X X X X X X O O X X X X X X O APPLY DATA CORING GAIN APPLY BORDER CORING GAIN OFFSET CAUSED BY VARIATIONS IN INPUT TIMING DNR27 – DNR24 = 01 HEX O X X X X X X O O X X X X X X O O X X X X X X O O X X X X X X O Figure 83. DNR27–DNR24, Block Offset Control DNR17 DNR16 DNR15 DNR14 DNR13 DNR12 DNR11 DNR10 DNR THRESHOLD DNR DNR DNR DNR DNR DNR 15 14 13 12 11 10 0 0 0 0 0 0 0 0000 0 11 •••• • • • •••• • • • •••• • • • 1111 1 062 1111 1 163 02 PIXELS 14 PIXELS DNR16 BORDER AREA 08 PIXELS 1 16 PIXELS DNR17 BLOCK SIZE CONTROL Figure 80. DNR Register 1 |
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