A channel over which pilot signal is transmitted. 可在其上传输导频信号的一种信道。
A colored flare used as a warning signal for trucks and railroad trains. 信号火一种为卡车或火车作警告信号的有色火焰
A control signal. 一个控制信号。
A decrease in signal power as measured between two points. 信号能量在两点间测量出来的减小量。参阅signal。
A device that converts a property of an input signal, such as frequency or phase, into an amplitude variation, depending on how the signal differs from a standard or reference signal. 鉴别器,鉴频器一种将输入信号的某一特征,如频率或相位转变为幅度变化装置,其变化大小因信号与标准或参考信号的不同程度而异
A disturbance, especially a random and persistent disturbance, that obscures or reduces the clarity of a signal. 干扰噪声一种干扰,尤指一处任意的和持续的干扰,使信号变模糊或减少
A filter whose transfer function is matched with the frequency spectrum function of input signal. 其传递函数与输入信号的频谱函数相匹配的一种滤波器。
A group of flags raised together as a signal. 作为信号一起扯起的一组旗
A radio signal tells the pilot of an airplane when his plane is off the beam. 飞机脱离航道时,会有一个无线电信号告诉驾驶员。
A red light is usually a signal of danger. 红灯通常是危险的信号。