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Topic: Why is there gain after FIR filter?
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fl

Posts: 90
Registered: 10/8/05
Why is there gain after FIR filter?
Posted: Apr 9, 2013 2:56 PM
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Hi,
I design a low pass FIR with 16 decimation rate with filterbuilder. The FIR has 582 taps, whose maximum coefficient is 0.0056 and minimum is -0.0012. I think that the FIR has been normalized (because there is no '1' as its maximum). When I filter the sampling data, I find that the waveform level is lifted from 2.5 to 2.8. The low pass feature does achieved. I do not know the reason why there is a vertical lift of the waveform. Could you explain it to me?

Thanks,



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