| CPC G06F 21/32 (2013.01) [A61B 5/1172 (2013.01); A61B 5/14552 (2013.01); G06V 40/1306 (2022.01); G06V 40/1365 (2022.01)] | 26 Claims |

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1. A user classification system comprising: a first sensor configured to produce a first sensor signal, the first sensor comprising a multi-platen ultrasound fingerprint sensor comprising: a first platen having a first round-trip propagation time; an array of first pixel transducers adjacent to the first platen; a second platen having a second round-trip propagation time different from the first round-trip propagation time; and an array of second pixel transducers adjacent to the second platen, wherein each of the first pixel transducers are electrically paired with a corresponding second pixel transducer; and a user device comprising: a processor communicably coupled to the first sensor; and a memory storing machine-readable instructions for performing an algorithm, wherein the algorithm is configured to identify a user of the system based on the first sensor signal.
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