A method for synthesizing near-field virtual sound image on mid-vertical plane
A virtual sound image and synthesis method technology, applied in the field of 3D virtual sound, can solve the problems of heavy workload and multiple scattering of sound waves, and achieve the effect of improving accuracy and avoiding complicated
Inactive Publication Date: 2018-11-02
SOUTH CHINA UNIV OF TECH
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In the actual near-field HRTF measurement, there are mainly the following three difficulties: (1) Since the measurement sound source is close to the subject, the sound wave will inevitably have multiple scattering and diffraction problems, so a specific small Size sound source; (2) Since near-field HRTF is related to distance, it is necessary to measure HRTF at different distances separately, and the workload is very large
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[0029] The present invention will be further described below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the scope indicated by the embodiments.
[0030] figure 1 It is a realization schematic diagram of a method for synthesizing a near-field virtual sound image on a vertical plane in the present invention. It considers the angular deviation of the sound source relative to the center of the head and relative to the ear in the near-field situation, and derives the corresponding angle correction formula. According to the angle correction formula, the near-field target HRTF data can be accurately extracted from the far-field known HRTF baseline database, thereby ensuring the accuracy of near-field virtual sound-image synthesis on the mid-vertical plane. This synthesis method of near-field virtual sound image on the mid-vertical plane can avoid the complicated measurement of near-field HRTF, and can convenient...
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The invention relates to a synthesis method for a near field virtual sound image on a mid vertical plane. The method comprises the following steps of giving a far field head-related transfer function HRTFfar, wherein a distance between a sound source and a head center is D; determining a head radius a and a distance d between a near field target sound image on the mid vertical plane and the head center; computing a correction angle theta of a right ear R according to a formula; extracting a far field HRTFfar(theta, R) as an HRTF of the right ear of the near field target sound image; extracting a far field HRTFfar(-theta, L) as an HRTF of a left ear of the near field target sound image according to the bilateral symmetry of the mid vertical plane; and carrying out convolution on the HRTFs of the two ears of the near field target sound image and an input sound signal in order to realize 3D virtual playback of the near field sound image on the mid vertical plan based on a headset. According to the method provided by the invention, the near field HRTF is extrapolated by the far field HRTF, so that the synthesis of the near field virtual sound image on the mid vertical plane can be realized simply, and a complicated measurement process of the near field HRTF is removed.
Description
technical field [0001] The invention relates to the technical field of 3D virtual sound, in particular to a method for synthesizing near-field vertical plane virtual sound based on far-field information. Background technique [0002] Virtual sound reproduction uses acoustic signal processing to simulate a virtual sound image in a specific spatial orientation, thereby giving the listener a sense of immersion and presence. Due to the simplicity and portability of playback devices (usually earphones), virtual sound playback has a wide range of applications in multimedia computers, personal audio mobile terminals and other fields. Head-related transfer function (head-related transfer function, HRTF) is the key to virtual acoustic signal processing. HRTF is the acoustic transfer function from the sound source to the ears in a free field, and is related to the sound source position, distance, sound wave frequency, and the physiological structure of the listener. When the distanc...
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IPC IPC(8): H04S7/00
CPCH04S7/303H04S7/304H04S2420/01
Inventor 钟小丽
Owner SOUTH CHINA UNIV OF TECH