双相调变 two-phase modulation ; biphase modulation

双重调变 double modulation

双极调变 dipole modulation

双平衡调变器 double balanced modulator

双重音调变换 DUALPIT

双铁心调压变压器 two-core voltage regulating transformer

双正交调变 biorthogonal modulation ; modulation biorthogonal

双音调调变频率 dual tone modulation frequency

双边频带调变 double sideband modulation DSB ; modulation double sideband