the error information when i use fdesign.lowpass to design a filter.

the code:

 h = fdesign.lowpass('N,F3db,Ap,Ast'  ,14, 0.93,0.1,60);

the error message is :

There is no enumerated value named 'N,F3db,Ap,Ast'.

But the 'N,F3db,Ap,Ast' is listed in the help info of the fdesign.lowpass.

do you know why this happened?thank you very much.

Answer 1

[Walter Roberson]

Notice:

      Note:   Specifications strings marked with an asterisk require the DSP System Toolbox™ software.

That entry is one of the ones marked with an asterisk.