dtmf.m

DTMF编解码在MATLAB中的仿真（gui设计）

%dtfm.m
function x=dtmf(key);
fs=8000;
N=0.1*fs;   %信号时间为50ms
R=1; 
f1=0; 
fh=0;
switch key
    case{'1','2','3'} 
        f1=697;
    case{'4','5','6'}     
        f1=770;
    case{'7','8','9'}       
        f1=852;
    case{'*','0','#'}       
        f1=941;
end
switch key
    case{'1','4','7','*'}   
        fh=1209;
    case{'2','5','8','0'}   
        fh=1336;
    case{'3','6','9','#'}   
        fh=1477;
end
x=wav_gener(R,2*pi*f1/fs,N)+wav_gener(R,2*pi*fh/fs,N);