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  ______   _    _     ______    _____    _    _   
 /_____// | || | ||  /_____//  |  ___|| | |  | || 
 `____ `  | || | ||  `____ `   | ||__   | |/\| || 
 /___//   | \\_/ ||  /___//    | ||__   |  /\  || 
 `__ `     \____//   `__ `     |_____|| |_// \_|| 
 /_//       `---`    /_//      `-----`  `-`   `-` 
 `-`                 `-`

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發送短信 : Experiments for signals and systems on a smartphone