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extract group delay form FDATool programmatically

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stephen williams
stephen williams 2019-10-8
关闭： MATLAB Answer Bot 2021-8-20
Can you tell me how to extract a filter's group delay from FDATool, in simulink, programmatically so I can apply it to a separate Delay block as a parameter? The goal here is to match a delay between two paths (one having a filter in line), so I can compare the outputs precisely in the time domain (with a cope block for example).

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回答（2 个）

Shubh Sahu
Shubh Sahu 2019-10-11
The Filter Design and Analysis Tool (FDATool) has been renamed to Filter Designer. And Group Delay can be calculated by fvtool. For more information please refer these links
https://www.mathworks.com/help/signal/ref/grpdelay.html
https://www.mathworks.com/help/signal/ref/fvtool.html?searchHighlight=fvtool&s_tid=doc_srchtitle
stephen williams
stephen williams 2019-10-14
Thanks for the response. I guess I am missing something. What I need is a single number, at a frequency I guess if delay is not constant, and I don't care about the graph. I have to use version 2016a, because of a third party tool limitation, but both fvtool and grpdelay work in that version. In theory I could get the fitler coefficients from FDATool in a simulink mask, and create a filter object and provide it to grpdelay, but I don't want the graph to pop up. Any ideas?

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