The Math Forum

Search All of the Math Forum:

Views expressed in these public forums are not endorsed by NCTM or The Math Forum.

Math Forum » Discussions » Software » comp.soft-sys.matlab

Notice: We are no longer accepting new posts, but the forums will continue to be readable.

Topic: Why is there gain after FIR filter?
Replies: 0  

Advanced Search

Back to Topic List Back to Topic List  

Posts: 121
Registered: 10/8/05
Why is there gain after FIR filter?
Posted: Apr 9, 2013 2:56 PM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply

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?


Point your RSS reader here for a feed of the latest messages in this topic.

[Privacy Policy] [Terms of Use]

© The Math Forum at NCTM 1994-2018. All Rights Reserved.