RAPID DTMF SIGNAL CLASSIFICATION VIA PARALLEL CASCADE IDENTIFICATION

The parallel cascade identification of nonlinear systems is used for t he rapid recognition of dual tone multi-frequency (DTMF) signals, i.e, the 'dual tones' used to encode the digits on a telephone keypad. The authors demonstrate that parallel cascades can correctly identify DTM F signals with half or less than half of the input data required by cu rrent methods.