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EP0440028A2 Multifrequency tone signal detector 失效
Mehrfrequenz-Tondetektor。

Multifrequency tone signal detector
摘要:
An MF digit or DTMF digit detector identifies MF digits or DTMF digits in a signal and eliminates talkoff as a source of false detection by analyzing the frequency spectrum of the signal which is provided by FFT and by using the history of the signal to determine whether an MF digit or a DTMF digit was simulated by a human voice.
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