Research On The Measurement Of Moving Sound Source Perception Threshold Of Human Ear In Three-dimensional Space

Since 2016,the first year of "virtual reality",the vigorous development of 3D film and television technology has brought unlimited development opportunities to 3D audio technology,but so far,there is still a certain gap between the development of 3D audio technology and 3D video technology,which cannot meet Consumers' demand for auditory effects cannot achieve an immersive audio-visual experience.The introduction of the feature of human auditory perception opens up new ideas for improving 3D audio technology.Therefore,in order to improve the algorithm complexity and time complexity of the current 3D audio acquisition technology,many scholars at home and abroad have begun to study the auditory perception threshold of the human ear.This thesis studies and measures the human ear's perception threshold for 3D space moving sound sources,that is,the minimum audible movement angle.Carrying out the research on the minimum audible movement angle of 3D audio space can provide the data basis and guidance for efficient perceptual acquisition of 3D audio,eliminate perceptual collection redundancy,and improve the performance of 3D audio compression and collection technology.At present,most of the research on the mechanism of human ear auditory perception is based on static sound sources.For example,when measuring the perception threshold of a certain point,the sound source is usually fixed at two places where the azimuth or distance is not far from each other,so that the subjects can judge whether there is a position difference between the two sounds,and gradually approach the human ear auditory perception threshold by continuously reducing the azimuth or distance between the two sound sources.Based on the research of static sound sources,this thesis uses a similar measurement method to study the perception threshold of moving sound sources in three-dimensional space.Firstly,the experimental environment for testing the auditory perception threshold of moving sound source is set up,which is used to collect the test audio signal database of different positions in three-dimensional space.Based on the existing subjective listening program,a listening test program suitable for moving sound source is designed.Secondly,a number of students are invited to take subjective listening test,and the horizontal angle,elevation angle and distance perception threshold of the initial threedimensional spatial moving sound source are quickly obtained by using a method similar to the traditional one up/two down psychoacoustic test method.Finally,the results are analyzed and processed,and the unreasonable values are eliminated and interpolated by Lagrange interpolation algorithm.Then,the perception threshold of moving sound source in three-dimensional space is obtained by the mathematical method of surface fitting,and the three-dimensional audio spatial parameter perception threshold surface model is established,which provides theoretical support for the subsequent design of inter-frame sparse acquisition algorithm based on spatial parameter perception acquisition model.