PAL制电视基础（国外英文资料）.doc

PAL制电视基础（国外英文资料） PAL system and its programming and decoding process PAL is short for Phase Alternation Line (Line by Line). PAL is on chroma orthogonal modulation, on the basis of the balance will be one of the chrominance components (FV component) inverter line by line, in the beginning (line) periodically change FV component phase sequence, on the closed end USES the average measures, in order to reduce the effects of phase error in the transmission. The significance of the phase distortion of 2.5.1 is affected The image distortion of color TV sets has the brightness distortion, the saturation distortion and the tonal distortion (the geometric distortion is not discussed). In this case, the brightness distortion mainly affects the level of the scene, the color saturation distortion changes the depth of the color, and the color change of the scene is caused by the color distortion. In the three kinds of distortion, the human eye is most sensitive to the distortion of the hue, and the phase distortion of the color signal in the NTSC system can lead to the obvious tonal distortion. Inaccurate color TV tuner, multipath effect and nonlinear of transmission system may cause phase distortion, practice has proved that to make the human feel tonal distortion, phase distortion should be less than + / - 5 °. The PAL system is developed to address the phase sensitivity. On the back The 2.5.2 PAL color signal PAL for chroma method, is also the first will be the primary signal 3 R, G, B transformation as a luminance signal and two color difference signal, and then use the method of orthogonal modulation balance the chromas gap between the luminance signal spectrum, these is the same with NTSC system. The difference is that the FV component of the chromaticity signal is inverted by line, and the color axis does not rotate. The rule of reverse is: As n in c: n = F U sin omega SCt + V cosine omega SCt, as n + 1 c: n + 1 = F U sin omega SCt - V cosine omega SCt, the mathematical e