Research of DTMF dialing system based on the goertzel algorithm and MATLAB simulation

The DTMF audio dialing signal is widely used in worldwide scope because of its high speed, easy automatic detection -, identification and extended telephone service. With new theories and algorithms continue to appear, digital signal processing technologies have opened up a lot of new application fields. This paper gives DTMF signal generation scheme on the theoretical basis of digital signal D/A, A/D converting, deduces the modified Goertzel algorithm based on the digital signal processing´s DFT algorithm, finishs the DTMF signal detection using the Goertzel algorithm filter banks, and finally, realizes MATLAB simulation of DTMF dialing system.