Re: simple filter question

[CdeMills]

Get some good lecture over digital filters, like f.i. 
Digital Signal Processing, Alan V. Oppenheim , Ronald W. Schafer
 
filter is the convolution operator: y = filter(B, A, x)
is equivalent to A*y = B*x
where * is the convolution operator, that is:
(Auteur)
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a(1) y(1) = b(1) x(1)
a(1) y(2) + a(2) y(1) = b(1) x(2) + b(2) x(1)
a(1) y (3) + a(2) y(2) + a(3) y (1) = b(1) x(3) + b(2) x(2) + ...

As a transfer function, the system frequency response can be directly
obtained as b(s)/a(s), where s=2*pi*j*f for continuous-time (analog) system,
or b(z)/z(z), if the system is discrete-time.

Regards

Pascal



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