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TDA4780 Datasheet(PDF) 14 Page - NXP Semiconductors |
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TDA4780 Datasheet(HTML) 14 Page - NXP Semiconductors |
14 / 44 page 1997 Feb 06 14 Philips Semiconductors Preliminary specification RGB video processor with automatic cut-off control and gamma adjust TDA4780 Note 1. Matrix coefficients should be tested by comparing RGB output signals with a reference RGB colour bar, which is fed in at (RGB)1 or (RGB)2 inputs. In the event of NMEN = 1 (NTSC) at minimum saturation the Y output and RGB output signals are not identical to the Y input signal. PAL/SECAM signals are matrixed by the equation: VG − Y = −0.51VR − Y − 0.19VB − Y NTSC signals are matrixed by the equations (hue phase shift of −2 degrees): VR − Y* = 1.39VR − Y − 0.07VB − Y; VG − Y* = −0.46VR − Y − 0.15VB − Y; VB − Y* =VB − Y For demodulation axis see Fig.11. In the matrix equations: VR − Y and VB − Y are conventional PAL demodulation axes and amplitudes at the output of the demodulator. VR − Y*, VG − Y* and VB − Y* are the NTSC-modified colour-difference signals. Fig.7 Cut-off measurement pulses. handbook, full pagewidth MGE878 maximum brightness nominal brightness ultra-black cut-off measurement line for green signal |
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