DTMF tone detection with Goertzel Algorithm

A signal generator to simulate the dual tones of a touch-tone telephone. Can be used to test the Goertzel algorithm. This is for dsp6713dsk board.

这是一个DTMF的解码程序，用了两种方法：一是FFT，而是Goertzel算法 -This code is designed to detect the DTMF. Two methods to achieve it: one is FFT and the other is Goertzel algorithm.