一、引言环绕立体声除了保留双通路立体声的方向感以外，还产生来自四面八方的包围感和具有比听音房间更大、混响更强的空间扩展感。因此深受到人们欢迎。环绕立体声感觉与心理声学中优先效应（也称哈斯效应）和掩蔽效应有关，放声时可以让直达声先到达聆听者以保证声像定位。 I. INTRODUCTION In addition to preserving the directional sense of two-way stereo, Surround Stereo also produces a sense of enclosure from all directions and a greater sense of room for reverberation than a listening room. So deeply welcomed by people. Surround sound perception and psychological acoustics in the priority effect (also known as Hass effect) and masking effect, letting sound when the direct sound to reach the listener to ensure the positioning of the sound image.