# Difference between revisions of "Discrete Filter"

From T-VEC Wiki

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<table> | <table> | ||

<pre> | <pre> | ||

− | Discrete | + | Discrete Transfer Function: |

A.z + B | A.z + B | ||

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where A, B, C, D are real numbers | where A, B, C, D are real numbers | ||

+ | |||

+ | or Alternatively a | ||

+ | |||

+ | Discrete Filter: | ||

+ | |||

+ | A + B.z^-1 | ||

+ | ---------- | ||

+ | D + C.z^-1 | ||

+ | |||

The output of the function is defined as | The output of the function is defined as | ||

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In.z0 : current input | In.z0 : current input | ||

In.z-1: previous input | In.z-1: previous input | ||

+ | |||

+ | NOTE: these 2 specifications are equivalent, one form is used by control engineers and the other is used by filter designers. The output function definition is the same regardless. | ||

</pre> | </pre> | ||

</table> | </table> |