This disclosure describes techniques to affix an embossed pattern on an object such that when the pattern is scratched over by a hard object such a coin, pencil, or fingernail, a distinctive sonic signature is emitted. The sonic signature can be used, e.g., by a virtual assistant application, a smart speaker, or other device, to identify the object.
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de la Bastie, Sebastien, "Embossed audio tag activated by touch", Technical Disclosure Commons, (September 04, 2019)