Rapid DTMF signal classification via parallel cascadeidentification
Michael J. Korenberg, P.W. Doherty · Electronics Letters · 1996
The parallel cascade identification of nonlinear systems is used for the 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 DTMF signals with half or less than half of the input data required by current methods.