The acoustic detector in the armband contains five piezoelectric cantilevers, each weighted to respond to certain bands of sound frequencies.
臂带上的声波检测器带有五个压电悬臂，每一个可以检测某个特定频段的声音。
Due to vibration at low frequencies and high power, felt was inserted between the brass bands and the sides of the cores.
由于输出牛在低频率和高功率情况下会产生震动，在铁芯边缘和铜带之间塞入毛毡。
A tuneable antenna is an antenna that can change resonance frequencies for effective reception of a wide range frequency bands.
一个可调谐天线是一个天线，可以改变一个广泛有效的频段接收共振频率。
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