multifrequency signal的用法和样例：
例句
- The signal applied here mixes with the oscillator current, causing an amplitude-modulated RF signal to appear at the plate.
信号从此输入并与振荡电路交连，形成调制了的射频信号并由屏极输出。 - This paper investigates the problems about the base-band signal shaping and the multi-rate signal processing of the radio-frequency signal.
本文对基带信号的成形和射频信号的多速率处理进行了研究。
