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Hi Kaz,
Yes. But the fir compensation filter only compensates the cic filter which does the decimation by 4. The compensation filter did not do the additional decimation by 2. You can tell that by checking the repeating points on the plot of the fir filter, which has 22.8MHz output sampling frequency. How to do this additional decimation by 2 using the same compensation filter so the total decimation rate is 8 (4*2)? The fir ouput sampling frequency should be 11.4MHz.
Thanks a lot,
Lee
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It is meant to compensate and decimate by 2. when implementing the compensation filter you have to discard every other sample from output. Either directly or as part of your fir implementation(to reduce resource). The response itself is referred to input Fs
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