People can well determine the direction of the sound source. In the horizontal direction, we rely on the difference in phase and intensity of the sound to determine the direction of the sound, since the time or distance at which the sound reaches both ears is different. The common stereo effect is achieved by listening to different sounds recorded in different locations on the left and right ears, so there is a sense of direction. In real life, when the head is turned, the direction of the sound you hear changes. However, in VR systems, the direction of the sound is not related to the movement of the user's head.