Some users have found that the sound emitted by their electric vehicle's low-speed warning sound system gradually changes after using it for a period of time. In fact, this is a distortion phenomenon. If the horn has a distortion problem, the cause should be identified in a timely manner, because the distortion will greatly affect the use of the electric vehicle's low-speed warning sound system. If it is distorted, the sound emitted by the horn may not be recognized by pedestrians, which will increase the risk of accidents.

The distortion of the low-speed warning sound system for electric vehicles, also known as high pitch distortion, is caused by the sound radiated from the speaker, which should only reproduce the added signal. However, in reality, in addition to the fundamental frequency signal sound, there are other frequencies of sound that appear in the radiated sound, making the sound sound sound abnormal. This phenomenon is called distortion. The distortion rate needs to be quantitatively compared with the sound pressure output for accuracy, but it should not exceed 5%.
The distortion of the low-speed warning sound system in electric vehicles is mainly caused by:
1. Driving force (current deformation caused by uneven distribution of magnetic flux, input exceeding rated input power).
2. Support part (flange part of elastic wave and vibration plate).
3. There are three important reasons for the vibration plate piston motion and segmentation motion.
The distortion of the low-speed warning sound system for electric vehicles includes:
1. Nonlinear distortion includes harmonic distortion and intermodulation distortion.
2. Transient distortion.
3. Harmonic distortion: It is generally caused by uneven magnetic field of the speaker and nonlinear distortion of the vibration plate system. It usually occurs at low frequencies because the amplitude is large at low frequencies, and non-linear distortions such as voice coil paper cones and elastic waves are prone to occur.
In the magnetic return gap of the speaker, not only is there a circular magnetic field corresponding to the thickness of the iron sheet, but in fact, there is also a magnetic field outside, but the magnetic field lines are not as dense. Therefore, the magnetic field is not uniform and has non-uniformity. Therefore, when the coil moves in the gap, the perceived magnetic field is uneven, which can cause some distortion.
4. Intermodulation distortion: It is caused by the mutual modulation of two signals of different frequencies when they are simultaneously added to the low-speed warning sound system speaker of an electric vehicle. Intermodulation distortion can cause distortion in tone, and when the intermodulation distortion is large, it can significantly deteriorate the playback sound quality of choir clapping and other equipment.
5. Transient distortion: This is caused by the vibration system of the low-speed warning sound system in electric vehicles not being able to keep up with the fast changing electrical signals, resulting in output waveform distortion. This distortion is related to the smoothness of the frequency response curve, and is more severe at each resonance point of the vibrating plate (equivalent to the peak and valley of the frequency response curve).
That's all for the introduction of the causes of sound distortion in the low-speed warning sound system of electric vehicles. We hope you can get some substantial reference value from our article. If you have any other questions, please feel free to consult us at any time. We will answer them for you one by one. Thank you for reading.