dtmf_4.m

用matlab的gui编写的DTMF双音多频信号生成与检测的演示程序

function [HT,T]=dtmf_4
Fs=8000;
N=400;
b_low=[0,0.56856,0];a_low=[1,-1.64528,1];
b_high=[0,0.81315,0];a_high=[1,-1.16410,1];
[H1,T]=impz(b_low,a_low,N,Fs);
[H2,T]=impz(b_high,a_high,N,Fs);
HT=H1+H2;
soundsc(HT);
save dtmf_data_4 HT;