發送短信 : Frequency hopping digital receiver and its implementation

 _    _     ______    ______    ______   _    _   
| |  | ||  /_   _//  /_   _//  /_   _// | \  / || 
| |/\| ||   -| ||-   `-| |,-    -| ||-  |  \/  || 
|  /\  ||   _| ||_     | ||     _| ||_  | .  . || 
|_// \_||  /_____//    |_||    /_____// |_|\/|_|| 
`-`   `-`  `-----`     `-`'    `-----`  `-`  `-`