help on understanding Band Properties of Arbitrary Response Filter in FilterBuilder

hello all,

I would like your help to understand the inputs of Frequencies and Amplitudes, of the Band Properties Panel.

So I open filterbuilder, select the Arbitrary Response Filter. In the Main tab I set Impulse Response to FIR, Order of 200 and Filter Type Single-rate. In the Response Specifications the number of bands is 1, I have specified the response as Amplitudes and the Frequency units are set to Hz. I set the Input Fs equal to 44100Hz.

In the Band Properties, the Frequencies vector acts as the X axis while the Amplitudes as the Y?

I guess what I'm asking is what do the vectors Frequencies and Amplitudes serve as?

Thank you in advance!

Answer 1

[Honglei Chen]

You can think of Frequency and Amplitude as samples from frequency response of the filter. If you plot Amplitude vs. Frequency, it should approximately look like your desired frequency response.

HTH