OLIV4D A broadcaster creates a PALplus signal by scaling an anamorphic 16:9 picture with 576 lines down to 432 lines, so that the picture appears letterboxed on a regular PAL TV set. The use of the colour subcarrier means these signals appear as very dark blue and yellow patterns on black bars on a regular 4:3 PAL TV set. For luminance, the scaling is done using a pair of matching low-pass and high-pass filters, with the low-pass result being the regular PAL compatible letterbox broadcast.|As Shown in the Disassembly Photo