Re: Filter Implementation

[shall689]

Thanks Doug,


Your work is getting me going in the right direction.  I don't know why I
was ever used excel in the first place.

You used a(1) (=1) for the y(n-1) term.   I was thinking that a(2)
(=-0.985033202259162) should be used for that term, i.e. y(n) = b(1)*x(n) +
b(2)*x(n-1) + a(2)*y(n-1).  Is that correct?

If a(2) is used for the y(n-1) term, the plot look like my excel plot, so
there is something I am misunderstanding about implementing the filter
equation.

Also, the filtered output has an offset if a(1) is used with y(n-1).

Stephen




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