Why does the CHEBWIN function give incorrect results in Signal Processing Toolbox 6.1 (R13SP1)?

When I use the following code:

   wvtool(chebwin(4096,30))

The main lobe of the time response does not have a peak at 1.0 as expected. However, if I use the code:

   wvtool(chebwin(4096,60))

I receive a peak amplitude of 1.0. I should receive a peak amplitude of 1.0 in all situations.

Answer 1

[MathWorks Support Team]

This enhancement has been incorporated in Release 14 Service Pack 3 (R14SP3). For previous product releases, read below for any possible workarounds:

This is a bug in Signal Processing Toolbox 6.1 (R13SP1) in the way that CHEBWIN handles the main lobe calculations..

There are no workarounds.