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Thread Subject:
Why is there gain after FIR filter?

Subject: Why is there gain after FIR filter?

From: fl

Date: 9 Apr, 2013 18:56:08

Message: 1 of 1

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?


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