LTPDA Toolbox™

The pole/zero model helper

The LTPDA toolbox contains a class (pzmodel) for creating and using pole/zero models. The pole/zero model helper GUI allows the user to visualise the pole/zero model as it's being designed. It also allows the user to quickly see how the corresponding IIR filter (miir object) will look for different sample rates.

To start the pole/zero model helper:

      >> pzmodel_helper

or click the appropriate button on the LTPDA Launch Bay.

Once the GUI is loaded, you will see the following figure:

You can add poles and zeros to the model by entering the frequency (and Q) in the edit boxes, then click Add pole or Add zero as appropriate. The response is then updated in the response axes.

Graphical User Interfaces in LTPDA

The Spectral Window GUI