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- $\begingroup$ Have you measured your laptop audio, 6i6 (use RMAA software) and PC audio (is it integrated audio chip in question) spectrum's separately? $\endgroup$Juha P– Juha P2021-01-17 08:21:24 +00:00Commented Jan 17, 2021 at 8:21
- 1$\begingroup$ Most likely your sound card is bandpass sampling EMI generated by a smart utility meter installed by your utility company. The duty cycle and period remind me of a Neptune water meter $\endgroup$Andy Walls– Andy Walls2021-01-17 14:06:31 +00:00Commented Jan 17, 2021 at 14:06
- $\begingroup$ Would you make the recording available please? $\endgroup$Olli Niemitalo– Olli Niemitalo2021-01-17 15:44:27 +00:00Commented Jan 17, 2021 at 15:44
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