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 _    _      ___       _____    _____     _  __  
| \  / ||   / _ \\    / ___//  |  ___||  | |/ // 
|  \/  ||  | / \ ||   \___ \\  | ||__    | ' //  
| .  . ||  | \_/ ||   /    //  | ||__    | . \\  
|_|\/|_||   \___//   /____//   |_____||  |_|\_\\ 
`-`  `-`    `---`   `-----`    `-----`   `-` --`

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發送短信 : Zeros of linear phase FIR filter with piecewise constant frequency response