how to make bandstop filter

I Want to filter a signal and I need to have stop band[299740,299750 Hz]. I use fdatool but it haz this Error: Fpass2 must be less than 22050.How should I design This Filter with no error

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Answer 1

[Wayne King]

You have the sampling frequency specified as 44100 Hz. Is that correct? If that is correct how can you have a stopband [299740,299750 Hz]?

If the data is sampled at 44100 Hz, then the spectrum is periodic with period equal to 44100 Hz. Add in the fact that a real-valued signal has to be conjugate symmetric in the Fourier domain and you only need to specify filter specifications in the interval [0 22050] Hz

That is the reason for the error message.

[vajihe]

so you mean Can't I have a filter in That band of frequency by given Fs(44100)? If it is possible What is a proper filter?

[Wayne King]

You can make a stopband somewhere in [0 22050] so for example you can have a stopband from [10000 15000] Hz.