dtmf tone interval 双音多频音间隔
DTMF Dual Tone MultiFrequency 双音多频
DTMF Dual-Tone Multifrequency Signaling 双音多频信号
DTMF Dual Tone Multiple Frequency 双音多频 ; 双音频多频率
DTMF Dual-Tone Multifrequency System 双音多频制
Dual Tone Multi-Frequency DTMF 双音多频
DTMF Dual Tone Multi Frequency 双音多频
Dual-Tone Multi-Frequency DTMF 双音多频
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