DTMF signal used as dialing signal in tone telephone applied in many new field widely.
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。
However, the Bell System was intrigued by touch-tone because it increased the speed of dialing.
然而，贝尔系统推出的触摸式的语气，因为它增加的速度拨号。
However, the Bell System was intrigued by touch-tone because it increased the speed of dialing.
然而，贝尔系统推出的触摸式的语气，因为它增加的速度拨号。
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