%Copyright:Mingxu?Zhang
%2015/3/15
%DTMF?signal?detect


%設(shè)信號經(jīng)濾波后為r
tm?=?[‘1‘‘2‘‘3‘‘a(chǎn)‘;‘4‘‘5‘‘6‘‘b‘;‘7‘‘8‘‘9‘‘c‘;‘*‘‘0‘‘#‘‘d‘];%?DTMF信號代表的16個數(shù)
f1=[697770852941];???????????????????%?行頻率向量
f2=[1209133614771633];??%?列頻率向量

?
v=fir1（2220.02‘high‘）;
r?=?conv（sv）;


w?=?0;
Average?=?0;
OUT?=?‘00000000‘;
K=[1820222431343842];
for?l?=?100:200;
????Average?=?Average?+?r（l）^2/100;
end
Average?=?100*Average;
c?=?1;
f?=?1;
for?u?=?1:100;
????w??=?w?+?r（c+u）^2;
end
while?c<32620?&&?f<9;
????w?=?w?-?r（c）^2?+?r（c+u+1）^2;
????if?w>2*Average;
???????X=goertzel（r（c+10:c+215）K+1）;??????????????%?用Goertzel算法計算八點DFT樣本
???????val?=?abs（X）;???????????????????????????%?列出八點DFT向量
???????subplot（42f）;
???????stem（Kval‘.‘）;grid;xlabel（‘k‘）;ylabel（‘|X（k）|‘）;?%?畫出DFT（k）幅度
???????axis（[10?50?0?120]）;
???????limit?=?50;?????????????????%
???????for?t?=?5:8;
???????????if?val（t）?>?limit?break?end???????%?查找列號
???????end
???????for?g=1:4;
???????????if?val（g）?>?limit?break?end???????%?查找行號
???????end
???????OUT（f）?=?tm（gt-4）;
???????f?=?f?+?1;
???????while?w>1.5*Average?&&?f????????????c?=?c?+?1;
???????????w?=?w?-?r（c）^2?+?r（c+u+1）^2;
???????end????
????else
???????c?=?c?+?1;
????end
end
disp（OUT）;

????????
????

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件???????1352??2015-03-15?09:59??DTMF\detect.m

?????文件???????1588??2015-03-15?09:59??DTMF\dtmf.m

?????文件????????809??2015-03-15?10:00??DTMF\generate.m

?????文件????????341??2015-03-15?10:00??DTMF\transmit.m

?????目錄??????????0??2015-03-15?10:01??DTMF

-----------?---------??----------?-----??----

?????????????????4090????????????????????5