signallingn.发信号；信号设备动词signal的现在分词形式.signaln.信号；标志v.(发信号)通知、表示adj.显著的Signal data processing system信息号数据处理系统signal converter storage tube信号变换存储管signal sample-and-process数据采集与处理signal transmission frequency信号频率signal power density spectrum信号功率密度谱signal unit resynchronization信号单元再同步Signal- to- clutter ratio信杂比signal carrier remote control载波遥控signal-to-crosstalk ratio信号串音比signal amplitude distribution信号幅度分布