Using the 73M2901CE DTMF Detector

By: Jeff Sorensen

Abstract: One of the features of the Teridian 73M2901CE single-chip V.22bis modem is the dual tone multiple frequency (DTMF) detection function. The DTMF detector uses Goertzel filters to detect valid DTMF tone pairs, which is a discrete Fourier transform (DFT) technique commonly used for detecting specific frequencies. The 73M2901CE supports all the modes described in this application note.

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APP 4997:
APPLICATION NOTE 4997,AN4997, AN 4997, APP4997, Appnote4997, Appnote 4997