Re: Control System Question

[Doug Stewart]

On Wed, Feb 8, 2012 at 8:24 PM, Thomas D. Dean <address@hidden> wrote:

On 02/08/12 17:00, Doug Stewart wrote:

y(n) = y(n-1) + (1/F1 + 1/F2)*x(n) + (1/F1 - 1/F2)*x(n-1)

den=[1 -1 0];

I do not understand why the 2nd order denom.

Tom Dean
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In z space this is

y=yZ^-1 + (a) xZ^-1  +bxZ-2

y(1  - z^(-1) ) = x( aZ^-1  bZ^-2

y             aZ^-1  +bZ^-2                            Z^2

__ =      -----------------------           *     _______

x              (1 - z^-1)                                   Z^2

y                aZ  +  b   

____  =   __________________
x                Z^2  -Z   +0

let me know how it works

Doug

--

DAS

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