DT MF信号是音频电话中的拨号信号，广泛应用于新一代电话机。

DTMF signal used as dialing signal in tone telephone applied in many new field widely.

youdao

DT MF信号是音频电话中的拨号信号，广泛应用于新一代电话机。

DTMF signal used as dialing signal in tone telephone applied in many new field widely.

youdao