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DTMF信号の「3」です。 ポーズ1ms → 信号（697Hz＋1,477Hz）75ms → ポーズ49ms の順に流れます。 It is "3" for the DTMF signal. Pause: 1ms → signal (697Hz+1,477Hz): 75ms →, pause: 49ms.
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＃COPYLEFT＃DTMF
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DTMF信号の「3」です。 ポーズ1ms → 信号（697Hz＋1,477Hz）75ms → ポーズ49ms の順に流れます。 It is "3" for the DTMF signal. Pause: 1ms → signal (697Hz+1,477Hz): 75ms →, pause: 49ms.
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