Intelligent terminal room temperature measurement method based on linear frequency modulation sound signal

Abstract

The invention discloses an intelligent terminal room temperature measurement method based on a linear frequency modulation sound signal. The method comprises the following steps: transmitting a linear frequency modulation signal by using an intelligent terminal loudspeaker; performing environmental noise reduction on the dual-channel sound signals received by the upper microphone and the lower microphone of the intelligent terminal; dividing interference of the signal according to distance and attenuation, and removing interference terms on the dual-channel sound signal after environmental noise reduction according to time delay calculation; then, relative time delay is calculated between the two-channel sound signals through guiding search, and the average sound velocity of the surrounding environment of the intelligent terminal is calculated by combining the sound path distance difference between an upper microphone and a lower microphone of the intelligent terminal; and finally, measuring the room temperature according to a sound velocity-temperature mapping relation. According to the invention, full-band noise in the environment can be effectively filtered out, interference of sound reflection obstacles on sound signals at the microphone can be suppressed, room temperature measurement of the intelligent terminal is realized from the perspective of sound signal processing, and the method has high portability and also has high accuracy, real-time performance and robustness.

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