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一、前言 日本广播协会(NHK)开发出传输高清晰度信号的微波(42GHz)数字式现场拾取装置(FPU)。就高清晰度信号传输的FPU而言,以往比较重视传送100km以上长距离的采用微波(3.5GHz～13GHz)多值数字调频(FM)方式的FPU,以及从小型、轻量化方面较多考虑其机动性。近年投入实际使用的有引进高清晰度无线摄像机的42GHz模拟FM方式的FPU等。
I. Introduction The Japan Broadcasting Association (NHK) has developed a microwave (42GHz) digital field pick-up unit (FPU) that delivers high-definition signals. FPU for high-definition signal transmission has traditionally focused on the FPU that uses microwave (3.5 GHz to 13 GHz) multivalue digital frequency modulation (FM) method to transmit long distances over 100 km, and more consideration has been given to small size and light weight flexibility. In recent years put into practical use of the introduction of high-definition wireless camera 42GHz analog FM FPU and so on.