symbol?=?{‘1‘‘2‘‘3‘‘4‘‘5‘‘6‘‘7‘‘8‘‘9‘‘*‘‘0‘‘#‘};
lfg?=?[697?770?852?941];?%?Low?frequency?group
hfg?=?[1209?1336?1477];??%?High?frequency?group
f??=?[];
for?c=1:4
????for?r=1:3
????????f?=?[?f?[lfg（c）;hfg（r）]?];
????end
end
Fs??=?8000;???????%?Sampling?frequency?8?kHz
N?=?800;??????????%?Tones?of?100?ms
t???=?（0:N-1）/Fs;?%?800?samples?at?Fs
pit?=?2*pi*t;


tones?=?zeros（Nsize（f2））;
for?toneChoice=1:12
????%?Generate?tone
????tones（:toneChoice）?=?sum（sin（f（:toneChoice）*pit））‘;
????%?Plot?tone
????subplot（43toneChoice）plot（t*1e3tones（:toneChoice））;
????title（[‘Symbol?“‘?symbol{toneChoice}‘“:?[‘num2str（f（1toneChoice））‘‘num2str（f（2toneChoice））‘]‘]）
????set（gca?‘Xlim‘?[0?25]）;
????ylabel（‘Amplitude‘）;
????if?toneChoice>9?xlabel（‘Time?（m

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????文件????????1066??2016-10-03?05:32??DTMF.m
?????文件????????1315??2016-10-03?05:32??license.txt