 Open "iirimp1.DE2" that should resides in the same directory
DSPLinks was installed. The schematic will be opened like following. This is to filter a Text file
and see its spectrum. Left click on TXTIN (U_0) to select it and right click to choose "Open
a Monitor".  Then you will see the figure of Unit Impulse. Only the first data has a value 1 and 0 for others. We will input this unit impulse to IIR filter. 
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