How to remove delay from idtf object?

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bman 2020-8-11

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https://ww2.mathworks.cn/matlabcentral/answers/578236-how-to-remove-delay-from-idtf-object

回答： Rajiv Singh 2020-8-11

I'd like to use the inv() function for an idtf object to generate a predistorted waveform. Right now I cannot because the inverse is noncausal due to a 13 second iodelay in the original transfer function. How can I remove the iodelay from the idtf object?

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Answer 1

Rajiv Singh 2020-8-11

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https://ww2.mathworks.cn/matlabcentral/answers/578236-how-to-remove-delay-from-idtf-object#answer_478249

You will need an invertible realization. Try high order transfer function estimations with no delays. Or, if the estimated model with delays is a good/accurate model, compute its frequency response (freqresp), invert it, and fit a transfer function to the inverse frequency response.

For literally just removing the delay you can do model.ioDelay= 0