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SAA4970T Datasheet(PDF) 6 Page - NXP Semiconductors |
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SAA4970T Datasheet(HTML) 6 Page - NXP Semiconductors |
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6 / 32 page  1996 Oct 25 6 Philips Semiconductors Preliminary specification Economical video processing IC (ECOBENDIC) SAA4970T Fig.2 Pin configuration. handbook, halfpage SAA4970T MGE091 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 52 51 50 55 56 54 53 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 TEST2 Pmirref UO VSSA VO VCC YO Vref Iref VrefH R1 R2 PIP CLMP IE WE RE VD HD RESET BONE HA VA ALE IT1 IT2 XtalI XtalO TEST1 CK1 VSS CK2 UVIN0 UVIN1 UVIN2 UVIN3 YIN0 YIN1 YIN2 VSS VDD YIN3 YIN4 YIN5 YIN6 YIN7 AD0 AD1 AD2 AD3 AD4 AD5 27 28 WRN RDN AD6 AD7 FUNCTIONAL DESCRIPTION ECO data path The data path performs the DCTI, peaking, phase compensation, framing and blanking functions plus colour reformatting and variable delay of Y to UV at the input and output of the data path. DCTI DCTI is implemented to get a dynamic interpolation of the low bandwidth U and V signals. First a 2 : 1 linear interpolation is done, to go from a 4 :1:1 format to a 4:2:2 format. A second interpolation is done in which the data path delay is varied on the basis of a function of the second derivative of the U and V signal (or more precise: ). The effect at an edge is that during the first half the data path delay is higher than nominal and in the second half it is lower than nominal. This will make the edge much steeper. As this second interpolation is done with the resolution equal to that of the Y samples and also with a zero DCTI gain a 2 : 1 interpolation is performed, a 4:4:4 format is obtained. The DCTI function can be controlled by setting the range to ±12, ±8, ±6 or ±4 pixels (see Fig.3) or by adjusting the gain to 0, 1 ⁄4, 1⁄2 or 1. An artefact of this processing exists when two edges are close together in the video. During the second half of the first edge a delay is chosen that will collect video data where the second edge is already active. The same is valid for the second edge. The result of this processing on a video pulse, which is looking like a hill, is that of a hill with one or two bumps in it. To prevent this from happening, the positions where the first derivatives in U and V change sign, are marked and used to limit the range of the relative delay. This function is called ‘over the hill protection’. It can be turned on and off. Figures 5 and 6 show the effect of the DCTI function with and without ‘over the hill protection’ when applied to a hill-shaped video pulse. t d d t d dU t d dV + {} |
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