Methods of sound source extraction for audio system of flight simulator

The flight simulator is a necessary device for training pilots. As a key component of flight simulator, audio system has direct impact on fidelity and immersion of flight simulation. Sound source extraction is the preparation step for audio system development and has become the hardest part in the development process. Based on this background, efficient sound source extraction methods were pursued in low-cost recording condition. The method of sound source extraction based on short-time Fourier transform was used. Shortcomings and advantages of the method were pointed out. To solve these weak points, spectral modeling synthesis technology was used, and the basic theory and implementing steps of the technology were discussed. Although real separation of sound sources can be realized by using this method, the theory is complicated and many steps need to be implemented by using complex signal processing algorithms. Therefore, according to the fact that aircraft engine sound sources are harmonic sound plus noise, simplified spectral modeling synthesis technology is used to extract engine start harmonic sound and noise. The final result shows that this method is valid. This method of sound source extraction can not only be applied to flight simulator, but also to all audio system developments of other simulators. Hence it has actual using value in engineering.