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

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summer
summer 2015-7-17
回答： Walter Roberson 2015-7-17
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.

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Walter Roberson
Walter Roberson 2015-7-17
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.

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