Automobile running speed detection method based on smart phone audio perception

The invention discloses an automobile running speed detection method based on smart phone audio perception. According to the method, a microphone of a smart phone is used for collecting sound signalsgenerated when an automobile runs, and the speed interval to which the automobile speed belongs is determined by analyzing the characteristics of the sound signals; meanwhile, a simple sonar system isformed by a loudspeaker and a microphone of the smart phone, and the speed of moving objects around pedestrians is obtained by analyzing high-frequency sound signals which are collected by the microphone, emitted by the loudspeaker and reflected by the moving objects. Finally, the speed of the automobile passing through the user is detected by combining the two results. According to the invention, high-frequency sound which cannot be perceived by human ears is emitted only by means of the loudspeaker in the smart phone, the microphone receives sound signals, the deployment cost is low, the anti-interference performance is strong, the privacy leakage problem does not exist, and the method is especially suitable for detection environments where vehicles sequentially pass and vehicles and pedestrians are close to each other, and has very high accuracy.