Necessity and Feasibility Analysis of Applying High-Frequency Audio to Roadside Auditory Warning

The vehicle sound insulation and high-speed driving cause Doppler effect of roadside auditory warning audio, which greatly weakens drivers’ auditory perception and sensitivity, and affects the warning effect. High-frequency audio refers to the frequency close to the limit of human natural sound. In order to explore the necessity and feasibility of applying high-frequency audio to roadside auditory early warning, the finite element method was used to simulate the transmission process of roadside warning audio during vehicle driving. Compared the audio warning effects of 12 working conditions, including 6 frequencies, and window opening or closing, and the sound pressure level (SPL) was used as an indicator to measure the driver’s auditory perception. Meanwhile, taking Jiashao Bridge as the actual project case study, the high-frequency audio design method suitable for roadside warning was proposed. The results show that the frequency of audio is increased from 250 to 2000 Hz, the SPL is increased by about 20 dB, and the auditory perception of audio is obviously enhanced. High-frequency audio (frequency between 1000 and 1500 Hz) can reduce the impact of vehicle sound insulation. The results effectively verify that High-frequency audio can improve the auditory perception of human ear, which has important significance for improving the effect of roadside warning and ensuring driving safety.