![Figure 4: The PFB half band filter structure after folding the even-symmetric filter weights hA[n] and ignoring the zero weights in hB[n].](https://www.wavewalkerdsp.com/wp-content/uploads/wordpress-popular-posts/2574-featured-125x75.png)
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Introduction to Interpolation and Upsampling - GNU Radio Tutorials: Half-Way Review
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