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The article focuses on the analysis of acoustic emission signals generated under dry sliding friction conditions. Two tests were conducted using a TRB3 tribometer with the disc made of 100Cr6 steel with a DLC coating, and pin made of corundum (Al2O3) and steel 100Cr6, respectively. Two tests with the disc without DLC coating were also carried out. The audio data written in the 16-bit linear pulse-code...