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引言在电视广播中,测量的主要作用可广义地定义为,从信号源起到发射信号为止,对信号链中所有设备和电路的校验和标准化,以保证预定的质量标准。有人希望把测量延伸到信号链的最末端——观看者的接收机屏幕。但是,除了在发射机的设计和安置方面会影响到接收信号的情况外,这当然是极不现实的。
Introduction In television broadcasting, the primary role of measurement can broadly be defined as normalization of the checksums of all equipment and circuits in the signal chain from the source until the signal is transmitted, in order to guarantee predetermined quality standards. One would like to extend the measurement to the very end of the signal chain - the viewer’s receiver screen. However, this is of course unrealistic, except in the case of transmitter design and placement that can affect the reception of the signal.