Head-related transfer function sub-band modeling method based on spherical harmonic expansion
A head-related transmission and modeling method technology, which is applied in the field of audio signal processing, can solve the problems of modeling accuracy and affecting the processing speed of the spatial audio system, and achieve the effect of low parameter quantity, wide applicability, and improved rendering accuracy
Pending Publication Date: 2022-03-15
BEIHANG UNIV
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The signal expansion method based on spherical harmonic basis functions is often used in HRTF spatial modeling and interpolation, but the modeling accuracy of this method is affected by the order of spherical harmonic coefficients; a large number of spherical Harmonic coefficients, which affect the processing speed of the spatial audio system
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[0043] Embodiments of the present application are described in detail below, examples of which are shown in the drawings, in which the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary, and are only for explaining the present application, and should not be construed as limiting the present application.
[0044] figure 1 It is a flow chart of a method for modeling head-related transfer functions in frequency bands based on spherical harmonic expansion provided by the embodiment of the present application. Such as figure 1 The specific implementation steps of the head-related transfer function modeling method divided into frequency bands are as follows S101-S105.
[0045] Step S101 , extracting the valley point of the HRTF magnitude spectrum in the vertical plane and analyzing its center frequency.
[0046] In step S102, t...
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The invention provides a head-related transfer function (HRTF) frequency-division modeling method based on spherical harmonic expansion, and the method comprises the steps: extracting a valley point of a mid-vertical plane HRTF amplitude spectrum, and analyzing the center frequency of the valley point; obtaining a target frequency band in combination with the distribution of the valley point center frequency and the division mode of the equivalent rectangular bandwidth; performing decomposition of different orders on the HRTF amplitude spectrum by using spherical harmonic expansion, and obtaining spherical harmonic coefficients of spherical harmonic primary functions corresponding to different orders through a least square method; according to the frequency range of the target frequency band, performing higher-order reservation on the spherical harmonic coefficient of the frequency point in the frequency band; and based on the reserved spherical harmonic coefficient, obtaining an HRTF amplitude spectrum corresponding to the target angle by using spherical harmonic inverse transformation. According to the spherical harmonic modeling method based on the HRTF amplitude spectrum, higher-order coefficient retention is carried out on a target frequency band influencing binaural sound source positioning, and the purpose of HRTF modeling by using fewer coefficients is achieved.
Description
technical field [0001] The invention relates to a method for modeling head-related transfer functions in frequency bands based on spherical harmonic expansion. Especially for the problem of parameter quantity and computational complexity, the auditory localization characteristics are used to model the target frequency band more accurately, so as to achieve the purpose of increasing the accuracy of sound source orientation perception by adding a small number of parameters. The method provided by the invention belongs to the field of audio signal processing. Background technique [0002] Head Related Transfer Function (Head Related Transfer Function, HRTF) plays an important role in spatial audio technology, which characterizes the process of sound waves from the sound source to the human ear drum through physiological structures such as the head, auricle, and torso. The HRTF is calculated after the excitation signal is played through a spatially discrete speaker, and the aco...
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IPC IPC(8): G06F17/15
CPCG06F17/15
Inventor 赵洪博王瑀楠
Owner BEIHANG UNIV