function?[B]?=?decode（ZAfad）
%
%?This?programm?analyze?a?frequency?coded?signalvector?and?sort?the?won
%?frequencies?its?key.
%
%?example:?????[B]?=?decode（ZA4000）?
%
%?Z?????????:?frequency?coded?signalvector?
%?A?????????:?dtmf?key?vector?
%?fa????????:?sampling?rate?in?hz
%?d?????????:?time?in?seconds
%?B?????????:?key?vector

n=length（A）;

for?k=1:n;
????%?fft?analyze?of?the?frequency?coded?signalvector
????temp=abs（fft（Z（k:）））;????????????????????????

????%?Analyze?to?the?half?sampling?rate?because?the?frequencies?after?are
????%?not?interesting?for?analyze.?They?were?created?by?sampling?the?signal?
????x=1:（fa/2）*d;
????%?maximum?of?the?array
????[ai]=max（temp（x））;
????%?frequency?1?
????f1=（i/d）-1;
????%?set?the?actuall?x?coordinate?at?area?+/-10?to?0?
????i=i-10:i+10;
????temp（i）=0;?
????%?maximum?of?the?array
????[ai]=max（temp（x））;
????%?frequency?2?
????f2=（i/d）-1;
????%?frequency?sort
????if?f1>1000
????????var=f1;
????????f1=f2;
????????f2=var;
????elseif?f1<1000
????end
????%?msgbox（num2str（f1））;
????%?msgbox（num2str（f2））;
???
????%?include?frequency?tolerance?and?sort?the?key?frequencies?（the?actuall??
????%?tolerance?are?at?with?time:?>=?0.0499?s?and?sampling?rate:?3300Hz）
????if?（（f1>692）?&&?（f1<720））
???????f1=697;
?????????elseif?（（f1>765）?&&?（f1<800））
????????????f1=770;
??????????????elseif?（（f1>847）?&&?（f1<880））
?????????????????f1=852;
???????????????????elseif?（（f1>936）?&&?（f1<960））
??????????????????????f1=941;
????end
??????????????????
????if?（（f2>1204）?&&?（f2<1240））
???????f2=1209;
?????????elseif?（（f2>1331）?&&?（f2<1360））
????????????f2=1336;
??????????????elseif?（（f2>1472）?&&?（f2<1500））
?????????????????f2=1477;
???????????????????elseif?（（f2>1628）?&&?（f2<1660））
??????????????????????f2=1633;
????end?????????
????????????
????%?msgbox（num2str（f1））
????%?msgbox（num2str（f2））
????%?sort?the?evaluated?frequencies?to?the?keys
????switch（f1）;
???????case{697};
???????????switch（f2）;
???????????????case{1209};
???????????????????taste=‘1‘;
???????????????case{1336};
???????????????????taste=‘2‘;
???????????????case{1477};
???????????????????taste=‘3‘;
???????????????case{1633};
???????????????????taste=‘A‘;
???????????end
???????case{770};
???????????switch（f2）;
???????????????case{1209};
???????????????????taste=‘4‘;
???????????????case{1336};
???????????????????taste=‘5‘;
???????????????case{1477};
???????????????????taste=‘6‘;
???????????????case{1633};
???????????????????taste=‘B‘;
???????????end
????????case{852};
???????????switch（f2）;
???????????????case{1209};
???????????????????taste=‘7‘;
???????????????case{1336};
???????????????????taste=‘8‘;
???????????????case{1477};
???????????????????taste=‘9‘;
???????????????case{1633};
???????????????????taste=‘C‘;
???????????end
????????case{941};
???????????switch（f2）;
???????????????case{1209};
???????????????????taste=‘*‘;
???????????????case{1336};
???????

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????文件????????1041??2006-03-18?15:26??genfcs.m
?????文件????????1724??2006-03-18?15:20??main_program_dtmf.m
?????文件????????3269??2006-03-18?15:25??decode.m
?????文件????????1438??2006-03-18?15:33??encode.m