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`"THD"_F("Square Wave") = sqrt(pi^2 / 8 -1)`

0.483425847608679

The Total Harmonic Distortion (**THD**) of a Square Wave is 0.483425847608679. The Total Harmonic Distortion of many standard signals can be computed analytically.

- Total Harmonic Distortion by Kevin Froczak (31 Jan 2016)
- I. V. Blagouchine and E. Moreau, “Analytic Method for the Computation of the Total Harmonic Distortion by the Cauchy Method of Residues” in
*IEEE Transactions on Communications*vol 59, no. 9, pp. 2478-2491 Sept. 2011. - D. Zwillinger,
*Table of Integrals, Series, and Products*, 8th ed. Oxford, UK: Elsevier, 2015, pp. 10-11