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1.引言在过去测量录象机的信杂比这一指标时,都是在它的输入端送一个40～50%电平的灰度信号,将此信号记录在磁带上,然后重放这一信号,再用示波器在它的输出端测量其杂波电平的峰-峰值。将此峰-峰值换算为有效值,与0.7伏的基准电平相比,再取其对数,即可
1. INTRODUCTION In the past when measuring the signal-to-noise ratio of a video recorder, a gray-scale signal of 40-50% level was input at its input. This signal was recorded on a magnetic tape and then reproduced A signal, and then use the oscilloscope to measure the peak-to-peak value of its clutter at its output. Convert this peak-to-peak value to a rms value that is comparable to the 0.7-volt reference level and then logarithmically