Abstract: Movie reproduction,the process of converting the image-form film soundtrack to wave-form movie sound,is a key step in old movie rerun.Traditional movie reproduction methods are time-consuming because of the cumbersome manual process.The current automatic sound generation algorithms for film soundtrack can ef-fectively save manpower.However,these methods ignore the signal changes in photoelectric conversion process,which result in distortion of the generated audio.To solve the problems,we propose a reproduction transformation rule-based sound generation algorithm for film soundtrack,which enables high-precision audio generation.Specifically,to solve the signal error problem in photoelectric conversion process,we propose an optical rule-based film soundtrack envelope restoration method.To improve the quality of the synthetic audio,we pro-pose a film sound generation method based on frequency modulation rules.Experimental results show that our method achieves a higher reproduction quality compared to state-of-the-art methods.Additionally,the sound sampling rate can be enhanced to 162.08%.