In order to solve the safety hazard of electric vehicles being difficult for pedestrians to detect due to their low noise and failure to dodge in a timely manner when driving on the road, adding a device that can provide warning sounds on electric vehicles can solve this safety hazard. Therefore, the low-speed warning sound system for electric vehicles was born. How many steps are required to invent an electric vehicle low-speed warning sound system that can produce sound to alert pedestrians?

Step 1: Use a sound collection device to collect sound signal samples from outside the vehicle: collect sound signals from multiple traditional vehicles of the same level and one pure electric vehicle under different operating conditions;
Step 2: Use a filter to extract sound signals within a specific frequency band from all the exterior sound signals collected in Step 1;
Step 3: Synthesize the sound signal extracted in step 2 according to different proportion components: remove the components of the electric vehicle sound signal from the traditional car exterior sound signal collected in step 1, and synthesize the extracted specific frequency band sound signal with the obtained reference sound signal according to different proportions and amplitudes;
Step 4: Conduct subjective evaluation tests on all sound samples obtained in steps one and three under specified sound intensity conditions;
Step 5: Calculate the objective psychoacoustic parameters of sound quality and A-weighted sound pressure level; The objective psychoacoustic parameters of sound quality include loudness, roughness, sharpness, jitter, and AI index;
Step 6: Conduct external sound field analysis on the sound signals with high subjective evaluation scores in Step 4, and determine whether they meet the requirements for sound field coverage and intensity;
Step 7: Establish a neural network evaluation prediction model: Based on the subjective evaluation score in step 4 and the objective psychoacoustic parameter values calculated in step 5, establish a BP neural network sound quality evaluation prediction model optimized by genetic algorithm;
Step 8: Establish a low-speed warning sound system for electric vehicles.
The present invention also provides a low-speed prompt sound system for Jiaxiang electric vehicles, comprising: a microprocessor MCU, a sound playback circuit, a storage circuit, a background noise measurement circuit, a CAN bus interface circuit, and a power supply circuit; The power circuit supplies power to the entire control system, and the storage circuit, sound playback circuit, background noise measurement circuit, and CAN bus interface circuit are respectively connected to the microprocessor MCU;
The above is a summary of the steps for inventing the low-speed warning sound system for electric vehicles. We believe that after reading it, it should be helpful to you. If you need it or have any questions, you can follow our official website or call us. Our dedicated personnel will answer your questions.