变换: vary; alternate; commutation ...频率: frequency; rate电阻抗变换频率试验: impedance change frequency test交换频率: crossing frequency; exchange frequence; exchange frequency; switching frequency切换频率: switching frequency转换频率: inversion frequency; switching frequency交换频率通信: frequency exchange signaling多普勒转换频率常数: doppler-shifted constant frequency频率变换: channel rotation; frequency change; frequency conversion; frequency tra lation; frequency transformation; frequency translation; frequency transposition; frogging频率变换，变频: frequency translation频率变换器: frequency transformer; frequency translator参数频率变换: parametric frequency conversion电压 频率变换器: voltage frequency transducer工作频率变换: operating frequency change类比-频率变换器: analog-to-frequency converter量子频率变换: quantum frequency conversion频率变换电路: frequency-conversion circuit频率变换调制: frequency shift keying (fsk)频率变换键控: keying frequency shift; keying, frequency shift (fsk)频率下变换器: frequency down convertor快速傅里叶变换频谱分析仪: fast-fourier-tra form ectrum analyzer; fast-fourier-transform spectrum analyzer频率变换器，周波变换器: frequency converter换频道: change the channel换频机: inverted frequency converter换频器: frequency changement; frequency changer
