Has the bandpass filter function changed recently?

2013 7 30
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I am using the Bandpass filter function as shown below:
d = fdesign.bandpass('N,F3dB1,F3dB2',Order,F3dB1,F3dB2,Fs);
d1 = design(d,'butter');
where I commonly specify N as 4, F3dB1 as 5 and F3dB2 as 450 and Fs as 2000.
I have used this many times up to yesterday and it worked fine. Today I am getting an error message as shown below:
"Error using fdesign.bandpass/set The name 'SpecificationType' is not an accessible property for an instance of class 'bandpass'."
I don't know whether there has been a sudden change in the input specifications, but even if I try and run one of the examples from the help file I get the same message. I will be very grateful to see if anyone else has come across this or if anyone can suggest why it's suddenly changed! Thanks, Rosie

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Wayne King
Wayne King 2013-7-30

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Hi, the following code should work:
Order = 4;
F3dB1 = 5;
F3dB2 = 450;
Fs = 2000;
d = fdesign.bandpass('N,F3dB1,F3dB2',Order,F3dB1,F3dB2,Fs);
d1 = design(d,'butter');
The only thing I can think of is that you have some file that is actually shadowing the actual UDD class file
Can you try the following:
dbstop in toolbox\signal\signal\@fdesign\@bandpass\bandpass.m
and then
d = fdesign.bandpass('N,F3dB1,F3dB2',Order,F3dB1,F3dB2,Fs);
to see if the debugger takes you to the correct file, should be:
toolbox\signal\signal\@fdesign\@bandpass\bandpass.m

更多回答（1 个）

Rosie
Rosie 2013-7-30

0 个投票

Thanks for your answer, I think it must have been something along those lines. Fortunately, closing down Matlab and re-opening it has fixed the issue, for now at least.

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