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combining filters to extract higher bandwidth signal

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bluespec9

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Hello,

I want to combine 2 digital filters (2.5 KHz bandwidth each) in some way so that combined response of both these filter can extract a 5 KHz bandwidth signal from a given input spectrum.
If it is possible kindly guide me how can I do that.

Thanks
 

Is there a specific reason why you don't design a filter for a 5kHz bandwidth in the first place?
If the characteristics of the filters permit it, you should be able to add the results of both filters (both having a center frequency differing by 2.5kHz) and have your signal. But as I said, why not filter with a 5kHz Bandwidth in the first place?
 

do you have the equations for the filter?
 

I just wanted to get filter out two channel and combine them to get higher bandwidth signal. I succeeded it in doing that by polyphase. Thnaks.
 

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