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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Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.