双音: double tone多频: multifrequency(双音多频)音调: dtmf双音多频制: dual-tone multifrequency system (dtmf)双音多频信号: dual-tone multifrequency signaling双音多频信令: dtmf dual tone multifrequecy signaling双音多频序列: dtmf双音多频应用: dtmf确认双音多频发送: conf.dtmf sending双音多频按键话机: dtmf phone set双音多频接收机: dual tone multifrequency receiver双音多频信号接收器: touch down point电话用双音多频式按键号盘测试方法: methods of measurement for pushbutton dialer with dtmf电话用双音多频式按键号盘技术要求: performance requirements of pushbutton dialer with dtmf启动双音多频,从移动台到网络: start dtmf启动双音多频证实,从网络到移动台: start dtmf acknowledge双音多频式按键电话机测试方法: methods of measurement for pushbutton telephone with dtmf双音多频式按键电话机技术要求: performance requirements of pushbutton telephone with dtmf停止双音多频,从移动台到网络: stop dtmf停止双音多频证实,从网络到移动台: stop dtmf acknowledge数据音多频: dtmf data tone multiple frequency双音: double tone◇双音多频 dual-tone multifrequency; 双音信号发生器 double-tone signal oscillator; 双音振荡器 double tone oscillator双音调: tone dual; tone, dual双音轨: sdh双音节: bisyllable