Maximally flat (maxflat) filters are a special class of FIR filters which have maximally flat passbands and stopbands for the given design parameters. The Maxflat Editor is shown below:
To use the Maxflat Editor:
Please note that the maxflat design algorithm is very demanding relative to the finite-precision arithmetic used to implement it on a PC. That can lead to the following problems:
Therefore, as a general rule, maxflat filters cannot be designed with more than a few hundred taps.
If the design does not converge, try reducing the rolloff specification and/or changing the transition center.
Once a maxflat filter has been designed, you can analyze its frequency response using the Frequency Response List. If the Automatic option is enabled, ScopeFIR will show you the frequency response at zero (DC), at the Transition Center, and at half the sampling frequency. See Using the Frequency Response List for more information on the Frequency Response List.
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