Pedestrian warning method and device for pedestrian warning device

Abstract

The invention discloses a pedestrian warning method and device for a pedestrian warning device, which synthesizes a warning sound that can approach the original engine sound to warn pedestrians, and has better warning effect. A pedestrian warning method for a pedestrian warning device, comprising the steps of: S1, acquiring the sound source of the engine sound; S2, converting the sound source into a spectrogram, and performing image processing to generate a position sequence and obtaining the sound source at each discrete time point. The amplitude A at each frequency point of i,n and phase φ i,n ; S3. Obtain the corresponding fundamental frequency f according to the body parameters of the vehicle. According to the fundamental frequency f corresponding to the position in the position sequence, the interpolation process obtains the amplitude A of all order harmonics thereof i and phase φ i ; S4, synthesize the engine signal y(t), and output it to the power amplifier to drive the speaker of the pedestrian warning device to sound.

Description

technical field [0001] The invention relates to the technical field of sound alarm, in particular to a pedestrian warning method and device for a pedestrian warning device. Background technique [0002] For new energy vehicles, such as electric vehicles, because they don't use an internal combustion engine, the car is quite quiet at low speeds. Therefore, when the car is driving behind the pedestrian, the pedestrian often cannot notice the existence of the car, which increases the probability of a car accident. At present, China has issued a draft that requires electric vehicles to be mandatory to install pedestrian warning devices to remind them of the presence of vehicles. For example, Chinese patent CN107310466A discloses a pedestrian warning method, device and system, and Chinese patent CN105489063B discloses a new energy vehicle pedestrian sound warning device with an active early warning function. However, most of the pedestrian warning methods or devices disclosed i...

AI Technical Summary

Problems solved by technology

However, most of the pedestrian warning methods or devices disclosed in the above-mentioned patents and other prior art are aimed at disclosing how the pedestrian warning device sounds, without paying attention to the quality of the issued pedestrian warning sound

[0003] Although the draft does not mandate any type of sound, not every sound is suitable for pedestrian warning devices. For example, if the sound is music, it is likely to further reduce the vigilance of pedestrians.

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