Sinc function

Today we're going to a Sinc function, both normalized and unnormalized. Apparently it's useful in digital signal processing.

ASP

1. Const M_PI = 3.14159265358979323846
3. ' Unnormalized sinc function.
4. function sinc(x)
5.     sinc = sin(x) / x
6. end function
8. ' Normalized sinc function.
9. ' REQUIRES: constant M_PI
10. function nsinc(x)
11.     sinc = sin(M_PI * x) / (M_PI * x)
12. end function

PHP

1. // Unnormalized sinc function.
2. function sinc($x)
3. {
4.     return sin($x) / $x;
5. }
7. // Normalized sinc function.
8. function nsinc($x)
9. {
10.     return sin(M_PI * $x) / (M_PI * $x);
11. }

• View ASP implementation on Snipplr
• View PHP implementation on Snipplr