Fouret, Joachim; Ahmadi, Masoud; El-Hennawey, Mohamed; Liao, Can
(Metrosol Inc; RPX Clearinghouse LLC, 2008)
A fast DTMF detector for filtering a packetized linear voice signal to identify whether the voice signal contains a DTMF tone. The detector includes a plurality of parallel notch filters for knocking down DTMF tones. The ...