Teledyne-lecroy DFP2 - Digital Filter Package 2 Manual de usuario descargar pdf (Pagina 19)

DFP2 Option

DFP2-OM-E Rev A ISSUED: November 2003 17

Example 2: Creating an IIR Filter Coefficient File Using Mathcad

Note: This example uses the Mathcad Signal Processing Extension Pack.

order

fcutoff .

A iirlow butter order( ) fcutoff,():=

0.083

0.166

0.083

1.404−

0.736

0.067

0.135

0.067

1.143−

0.413

0.061

0.122

0.061

1.032−

0.276

⎛

⎜

⎝

⎞

⎠

x 0 .001, .5..:=

0 0.1 0.2 0.3 0.4 0.5

0.5

gain A x,()

0.50 x

Now create an ASCII file containing the coefficients: IirFilter.txt

Note: The diskette icon, the file name, and the "A" below it are the representation of a Mathcad "File Output" component.

It is inserted by selecting Insert, Data, File Output. You must specify the file name ("IirFilter.txt" in the example) and fill in

the variable name that is the source of the data ("A" in the example). Be sure to specify a complete path for the file.

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Teledyne-lecroy DFP2 - Digital Filter Package 2 Manual de usuario Pagina 19