Heating, ventilation, and cooling (HVAC) systems regulate ambient temperature in a room based on temperature values detected by dedicated temperature sensors. Such sensors are expensive. This disclosure describes obtaining temperature values in a room based on emitting ultrasonic pulses from a speaker and detecting back-reflected ultrasonic signals from the room to obtain the ultrasonic impulse response of the room. Changes in the ultrasonic impulse response are detected and corresponding temperature values are predicted using a Gaussian mixture model (GMM) or other suitable technique. The described techniques can enable any device capable of transmitting and detecting ultrasound to act as a temperature sensor.
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Shin, D; Li, Wei; and Guo, Jian, "Ultrasonic Room Thermometry Using A Smart Speaker", Technical Disclosure Commons, (November 05, 2020)