多频: multifrequency制: make; manufacture多频制信令: compelled multi-frequency signaling双音多频制: dual-tone multifrequency system (dtmf)多频互控信令,多频制信令: compelled multi-frequency signaling调频制: frequency modulation system二频制: two-frequency system分频制: frequency division system话频制: voice frequency system双频制: double frequency system; double-frequency recording; two frequency system; twofold frequency system四频制: quadruple-frequency system调频调频制: frequency modulation frequency modulation调频制广播: frequency modulation broadcasting二次变频制: double super system; double-super system二频制位: binary digit(bit); binary digit（bit）改进调频制: mfm; modified frequency modulation模拟调频制: analog frequency modulation system双变频制: double conversion system双路移频制: four frequency diplex; frequency shift twinplex; twinplex system双频制信号: two-frequency signalling移频制通信: frequency-shift communication语言倒频制: speech inversion system直接调频制: direct frequency modulation system多频,倍频: multiple-frequency多频带: mb; multiband
