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现今遥控彩电几乎都采用电压合成调谐方式。电压合成调谐技术(Voltage Synthetic Tuning,简称为VST)出现于70年代后期。这一技术实现了全自动、全电子化选台,大大提高了调谐精度,减小了调谐误差,方便了用户。其特点是运用微型计算机技术对数字信号进行运算和处理从而对彩电调谐实施控制。至今,这项技术已很成熟。本文以日本三菱公司80年代末开发的微处理器M50436-560SP为例介绍这项技术。由M50436-560SP为中心组成的选台电路见图1。
Almost all of today’s remote color TV use voltage synthesis tuning method. Voltage Synthetic Tuning (VST) appeared in the late 1970s. This technology to achieve a fully automatic, fully electronic election Taiwan, greatly improving the tuning accuracy and reduce the tuning error, user-friendly. Its characteristic is the use of microcomputer technology for digital signal processing and processing in order to control the implementation of color TV tuner. So far, this technology is very mature. In this paper, the Japanese MITSUBISHI 80 microprocessor developed in the late M50436-560SP as an example to introduce this technology. The M50436-560SP centering channel selection circuit shown in Figure 1.