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

A technology of head-related transmission and spherical harmonics, which is applied in the field of signal processing, can solve problems such as model underfitting, unreasonable sub-band allocation with the same degree, and the lack of much theoretical basis for research on sub-band settings with different degrees.

Active Publication Date: 2017-02-15
INST OF AUTOMATION CHINESE ACAD OF SCI
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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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  • Sparse modeling method and system of header related transmission function based on spherical harmonic function
  • Sparse modeling method and system of header related transmission function based on spherical harmonic function
  • Sparse modeling method and system of header related transmission function based on spherical harmonic function

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[0084] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0085]It should be noted that, in the drawings or descriptions of the specification, similar or identical parts all use the same figure numbers. And in the accompanying drawings, it is marked for simplicity or convenience. Furthermore, implementations not shown or described in the accompanying drawings are forms known to those of ordinary skill in the art. Additionally, while illustrations of parameters including particular values ​​may be provided herein, it should be understood that the parameters need not be exactly equal to the corresponding values, but rather may approximate the corresponding values ​​within acceptable error margins or design constraints.

[0086] The basic idea of ​​the exemplary embodiment of the ...

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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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04S7/00
CPCH04S7/305H04S2400/05
Inventor 陶建华戚肖克
Owner INST OF AUTOMATION CHINESE ACAD OF SCI
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