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Posted By

Scooter on 11/08/08


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math


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Sinc function

 / Published in: PHP
 

URL: http://reusablecode.blogspot.com/2008/11/sinc-function.html

Both normalized and unnormalized sinc functions. Apparently useful for digital signal processing.

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  1. <?php
  2.     /*
  3.     Copyright (c) 2008, reusablecode.blogspot.com; some rights reserved.
  4.     
  5.     This work is licensed under the Creative Commons Attribution License. To view
  6.     a copy of this license, visit http://creativecommons.org/licenses/by/3.0/ or
  7.     send a letter to Creative Commons, 559 Nathan Abbott Way, Stanford, California
  8.     94305, USA.
  9.     */
  10.  
  11.     // Unnormalized sinc function.
  12.     function sinc($x)
  13.     {    
  14.         return sin($x) / $x;
  15.     }
  16.  
  17.     // Normalized sinc function.
  18.     function nsinc($x)
  19.     {
  20.         return sin(M_PI * $x) / (M_PI * $x);
  21.     }
  22. ?>

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