请问filterDe​signer界面中的​幅值响应和幅值响应估​计分别指什么，有什么​不同？

查看滤波器幅频响应性能时，应该按照哪一个来呢？

[Walter Roberson]

Approximate translation:

What do the amplitude response and amplitude response estimation in the filterDesigner interface mean and what are the differences?

When checking the amplitude-frequency response performance of the filter, which one should be followed?

Answer 1

[Abhinav Aravindan]

Hi @天

The ‘Magnitude Response’ and ‘Magnitude Response Estimate’ in the “Filter Designer” refer to different methods of analyzing the filter.

1. Magnitude Response: The Magnitude response is derived from the Frequency response, which is the filter transfer function evaluated at the unit circle, H(z) =H(e^jω).
2. Magnitude Response Estimate: The Magnitude Response Estimate is obtained by running input data made up from sinusoids with uniformly distributed random frequencies through the filter and computing the ratio between output data and input data.

The description for the same and further detail can be found in the “Filter Analyzer” documentation attached below under the Analysis section.

https://www.mathworks.com/help/releases/R2024a/signal/ref/filteranalyzer-app.html#:~:text=Analyzer%20%E2%80%94%20File%2C%20analysis%2C%20and%20analysis%20options