## 1 Introduction
### Research Status of Sound Simulation Systems
#### 1.1.1 Sound Design and Simulation Technology
In the same year, an active sound management system was developed by [PERSON] of Jilin University, which is used for sound simulation in the car and warning sound outside the car. The sound design, synthesis algorithm, and hardware implementation of the system are described in detail. [PERSON] of Soochow University studied the engine sound simulation system used in hybrid vehicles where a good transition of sound was achieved during vehicle mode switching [16; 17]. [PERSON] of Southwest Jiaotong University proposed a method to realize driving motion in the study of vehicle driving simulators. This method combines the reading of different sound effects with the simulated driving platform [18]. [PERSON] proposed a method of sound synthesis. This method is based on the short-time Fourier transform and synthesis technology of the Kaisai window function. The sound concept design goal in the car is formulated, and the sound calibration and evaluation method is established [19]. [PERSON] of Jiangnan University proposed a method for real-time synthesis of engine sound. This method is based on the continuous speed sample of the engine and extracts the harmonic parameters of the sound through discrete Fourier transform and K-means clustering. The mathematical model of the spectrum is established, and then the harmonic parameters are brought into the mathematical model. The sound of the corresponding engine speed is calculated in real time [20]. [PERSON] of South China University of Technology studied how to design the electric car sound based on the needs of people; the sound pattern and type of sound quality perception is studied and a set of virtual reality car sound evaluation system was developed [21]. In addition, [PERSON] of SAIC Technology Center proposed a vehicle active sound control method. This method takes the vehicle operating parameters as the input and synthesizes based on the 'particle algorithm' extended by the overlapping addition algorithm. This method improves the interest of sound during driving and is verified by real vehicles [22]. The feature classification of the sound is used by [PERSON] of the Pan-Asian Automotive Technology Center for active sound effect analysis. This technology has achieved good results through sound effect classification; therefore, this feature classification method can be applied to the sound design of new energy vehicles. [PERSON] proposed a method where the engine exhaust sound can be analyzed offline and the corresponding segments are extracted; then, the motional exhaust sound is applied to the pure electric vehicle to simulate the acceleration sound [23; 24]. Research by scholars on automobile sound simulation systems has mainly focused on the analysis of sound and sound synthesis technology. The sound quality of the auto mobile interior is directly affected by the auditory perception of simulated active sound. Automotive accelerated sound quality theory is used in sound design combined with sound synthesis technology to create a more personalized acceleration sound for pure electric vehicles.