Sparse modeling method and system of header related transmission function based on spherical harmonic function

Abstract

The invention discloses a sparse modeling method and system of a header related transmission function based on spherical harmonic function. The method comprises the following steps: processing a to-be-measured header related transmission function to generate the minimum phase header related transmission function, and removing a minimum phase amplitude mean value in full-measurement direction to obtain the minimum phase header related transmission function with the minimum space difference; modeling the minimum phase header related transmission function with the minimum space difference to obtain a sparse spherical harmonic coefficient; and generating the full-spatial continuous header related transmission function according to the space direction through the sparse spherical harmonic coefficient interpolation. Therefore, the interpolation spectrum distortion degree of the full-spatial continuous HRTF is lowered, the computing complexity is lowered, and the required storage amount is small; the method can be conveniently applied to dynamically drawing environment in an actual virtual reality system without being limited by individual personality; the system has high robustness and can be conveniently applied to the actual environment.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of signal processing, and in particular to a method and system for sparse modeling of head-related transfer functions based on spherical harmonics. Background technique [0002] The explosion of the field of virtual reality has brought more and more attention to virtual hearing. Virtual reality includes virtual vision and virtual hearing. Among them, the key issue of virtual hearing technology is to restore the same positioning characteristics as natural hearing. The human auditory process can usually be regarded as a sound source-channel-receiver model, in which the channel includes the diffraction and interference of the sound source through different parts of the human body, and finally reaches the tympanic membrane, which can be regarded as a spatial digital filter, called head-related transmission Function (Head-Related Transfer Function, HRTF), which contains all spectral fea...

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Problems solved by technology

[0004] (1) Since the importance of different subbands is different in human auditory perception, it is unreasonable to assign the same degree to all subbands, and there is not much theoretical basis for the research of setting different degrees for some subbands;

[0005] (2) If the selected degree is too small, it will cause the model to underfit, so that when the interpolation is full-space continuous HRTF, it will produce a large spectral distortion with a high probability

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