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显象管所用彩色萤光粉的色度,是彩色电视系统的基础规范之一;对摄象机或胶片扫描装置进行比色设计时,不能不注意到它。1953年美国电视系统委员会(NTSC)所规定的色度坐标,现在已经毫无现实意义,因为萤光粉已经有了重大改变,而图象信号源装置不能不适应正在生产的显象装置。同时,新式彩色摄象机设计及其它图象源设计,近来采用了一种线性矩阵,这就更加要求显象萤光粉必须与图象源光谱分介之间密切匹配;因为这种矩阵近似地计入了摄象机理想分光敏感曲线负值部分的作用,而有效光谱分介里引入这些负值部分之后,将要求匹配更加苛刻。英国成立了一个工作组来研究本国的实际情况,并作出建议以改进第1逐行倒相系统(PAL System 1)所规定的接收机的色度。 本文第一部分综述1953年以来使用的各种萤光粉,评定它们的工作性能,从而形成工作组的决定。评论了各种方案的优缺点,并在结论中提出建议。对于第一部分所述的实验及观察结果,又在第二部分作定量的比色研究。分析了基色萤光粉组稍稍偏离设计方案的影响,正如目前应用的彩色电视接收机已经遇见的情况一样;探讨了按原来 NTSC 方案的萤光基色组所设计的摄象机的彩色重现问题。结论是:可以容许色度坐标有小的改变;但若按 NTSC 基色组设计摄象机,则现有接收机中彩色质量?
The chromaticity of the color phosphor used in the picture tube is one of the basic specifications of a color television system. It is indispensable to note the colorimetric design of a camera or film scanning device. The chromaticity coordinates specified by the 1953 National Television System Committee (NTSC) are now impractical because the phosphor has changed significantly and the image source device can not be adapted to the developing device being produced. At the same time, new color camera designs and other image source designs have recently adopted a linear matrix that further requires that the phosphor be closely matched to the spectral source of the image source; as this matrix approximates To include the negative part of the ideal spectral sensitivity curve of the camera, and the introduction of these negative parts of the effective spectral separation will require more stringent matching. A working group was set up in the United Kingdom to study the real situation in the country and to make recommendations to improve the receiver’s chromaticity under the first PAL progressive system (PAL System 1). The first part of this article reviews various fluorescent powders used since 1953 and assesses their performance to form the working group’s decision. Comment on the strengths and weaknesses of the various options and make recommendations in the conclusions. For the first part of the experimental and observation results, but also in the second part for quantitative colorimetric studies. The effect of slightly deviating from the design scheme for the primary phosphor set was analyzed, as has been the case for the color television receivers currently used; the color reproduction of the video camera designed for the primary phosphor set of the NTSC scheme was discussed . The conclusion is: can allow a small change in chromaticity coordinates; However, if the design of the camera according to the NTSC color group, the existing color quality of the receiver?