I would like to cite "fred harris rule of thumb" for estimating filter order. Is there a book or paper where I can find this rule of thumb? Thanks a bunch.

  • $\begingroup$ i know about fred harris, but i have never heard of a *"fred harris rule of thumb". i gotta few rules of thumb, too. but i don't think any are published. $\endgroup$ – robert bristow-johnson Jan 11 '18 at 7:29
  • $\begingroup$ It was also mentioned in this answer. You could ask Dan for a reference (by leaving a comment under his answer). $\endgroup$ – Matt L. Jan 11 '18 at 8:01

You can find the formula for (at least) one "Harris method" or "Harris approximation" in Multirate Signal Processing for Communication Systems, Fredric J. Harris, 2004, page 216, equation (8.16), with details in Chapter 3. F. Harris calls it "harris approximation" (without capital for the name), namely:

$$ N = \frac{f_{SMPL}}{\Delta f}\frac{Atten(dB)}{22}$$

Also in Digital Communications with Emphasis on Data Modems: Theory, Analysis, Richard W. Middlestead, page 752, equation B.39.

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