平均: average; mean图像信号: picture signal电平: electrical level; level图像信号平均电平: average picturesignal level平均图像电平: apl average picture level; mean picture level平均信号电平: average signal level图像黑色信号电平: picture black平均图象电平: average picture level信号电平: signallevel; sl signal level信号电平表: signal level meter信号电平计: meter signallevell; meter, signal-level (slm); signal-level meter (slm)电图像信号: electrical picture signal蓝图像信号: blue video signal图像信号: image signal; picture intelligence; picture signal; positive picture polarity; vision signal彩色信号电平: color level; colour level; colout level测试信号电平: test signal level传真信号电平: facsilinile signal level; facsimile signal level; facsimile-signal level电视信号电平: television level; television signal level峰值信号电平: peak signal level黑色信号电平: black level接收信号电平: rsl received signal level节目信号电平: program level门限信号电平: threshold signal level钳位信号电平: block level视频信号电平: video level
