Touch-tone phone as shown below, when pressing a key will be generated as shown in the corresponding frequency analog signals and, through detection of the signal frequency to identify the corresponding button. Test through the preparation of a digital signal analysis program to simulate the function of the completion of the above.

Packet : 357385917.1ban.rar filelist
7.1ban\interface.fig
7.1ban\interface.m
7.1ban\interface.asv
7.1ban\subdig.m
7.1ban

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