... 多频发送器 multifrequency sender，MFS 多频终端 multifrequency terminal 多频音调 multifrequency tone ...
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DTMF Dual Tone MultiFrequency 双音多频
dual tone multifrequency receiver 双音多频接收机
dual-tone multifrequency system 双音多频制
DTMF Dual-Tone Multifrequency Signaling 双音多频信号
Double Tone MultiFrequency 双音多频
Tone Multifrequency Signaling 双音多频信号
DTMF Dual-Tone Multifrequency System 双音多频制
tone multifrequency 双音色多频
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