Research And System Implementation Of Virtual Surround Sound

Standard surround sound system requires multiple speakers for the playback, while the speakers are always of high quality and the majority of ordinary consumers cannot afford the price of the high-quality speakers.But virtual surround sound system can be a good solution to this problem,this technology does some digital signal processing of sound data by using head-related transfer function(HRTF), people can feel the virtual surround sound effect or will locate the sound source from a particular direction when the sound is played with headphones or two speakers.This paper first introduces the development of virtual surround sound technology, research actuality. Based on that, this paper analyzes the related theoretical knowledge of virtual sound space, including the elements that matters to locate sound source correctly and head-related transfer function. In the next part, this paper focuses on the method of how we can get the HRTF data and the introduction theory of measuring HRTF, and analyzes the characteristics of HRTF data set by using several public HRTF databases.The fourth chapter elaborates the details of the implementation of virtual surround sound system in three-dementional space based on headphone playbacks.This implementation focuses on three-dimentional space to do the sound data processing.The fifth chaper mainly introduces the implementation of virtual surround sound on Android platform, including the analysis of Android frameworks and audio processing flow, the software processing flow and the methods that accelerate the speed of real-time processing. This paper also completes the subjective tests on audio effects of the system. The test result shows that the implemented system can obtain good virtual surround sound effect.