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高兴地看到本刊86年第2期,在问题讨论栏目中,专门讨论了TA7193P解码集成电路分析中的一些问题。这是贯彻“双百”方针的具体体现,有利于开展学术探讨,弄清问题,同时对该集成电路的应用也具有实际意义。现仅以本人教学中的体会谈一些看法,谬误之处,敬请同仁指正。 TA7193P电路分析中值得商榷的关键问题是相位问题。如APC电路中的锁相位置,基准副载波f_(sc)压控振荡器各路输出的相位,正确同步解调U、V分量所需f_(sc)的相位等等。在分析相位时,应以色度通道输入的F.B.A.S的极性作为前题。这一点参考资料
Happy to see the magazine No. 2 of 86 in the discussion section, devoted to discuss some of the problems in the analysis of the integrated circuit of the TA7193P decoding. This is a concrete manifestation of implementing the “double hundred” principle, which is conducive to carrying out academic discussions and clarifying problems, and is also of practical significance for the application of this integrated circuit. Now I only talk about some of the views of teaching experience, fallacy, please correct me colleagues. TA7193P circuit analysis is questionable the key issue is the phase problem. Such as phase locking in the APC circuit, the phase of the outputs of the voltage-controlled oscillator of the reference subcarrier f_ (sc), the phase of f_ (sc) needed to correctly synchronously demodulate the U and V components, and the like. When analyzing the phase, the polarity of the F.B.A.S. input by the chrominance channel should be used as the subject. This reference