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Altera_Forum
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15 years ago

Unwanted offset attenuation in FIR filters

My FIR is now working so far - thanks to Altera Guru "MSchmitt" - but I still have two problems left. Please have a look at the attached pictures - there is an unwanted offset attenuation of 6dB in t...
Altera_Forum's avatar
Altera_Forum
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15 years ago

I thought I was using only signed representations, when switching the pulldown in the FIR comiler to "signed" - so, this is obviously not the case - what do I have to do in addition?

:confused::confused::confused:

So, if the arbitrary gain is a result of the number of coefficients - what number would you suggest to get optimal results? Would it be a good idea to switch from "auto scaling" maybe to e.g. "auto scaling to power 2"? Under what conditions?