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Spherical regular dodecahedron sound source used for near-field HRTF measurement and design method thereof

A dodecahedron and design method technology, applied in the field of electroacoustics, can solve the problems of large sound source size, inapplicability, and poor low-frequency characteristics, and achieve the effects of improving low-frequency characteristics, reducing multiple scattering, and increasing scale

Inactive Publication Date: 2010-12-08
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

However, these sound sources are large in size and have obvious multiple scattering; and their frequency response range is generally between 125Hz and 8kHz, and their high-frequency characteristics are poor, so they are not suitable for near-field HRTF measurement
[0005] Inspired by the above-mentioned regular dodecahedral sound source, Nishino proposed a small regular dodecahedral sound source for near-field HRTF measurement. Its equivalent diameter is 0.038m, but the directivity difference of the sound source near 4kHz has reached 8dB The order of magnitude, the low-frequency characteristics below 1kHz are poor, and cannot meet the directivity error requirements of near-field HRTF

Method used

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  • Spherical regular dodecahedron sound source used for near-field HRTF measurement and design method thereof

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[0031] like figure 1 As shown, the spherical regular dodecahedron sound source used for near-field HRTF measurement of the present invention includes a spherical metal shell 3 and twelve speaker units 1 . Twelve speaker units are evenly distributed and fixed on the inside of the spherical metal casing 3, and every three speaker units are located on the same latitude plane of the spherical metal casing 3; figure 2 As shown, the third speaker unit (i=3) blocked by the line of sight is located on the same latitude plane as the first speaker unit (i=1) and the second speaker unit (i=2), and the fifth speaker unit (i=5) . The sixth speaker unit (i=6) and the fourth speaker unit (i=4) are located on the same latitude plane, and the rest of the speaker units are deduced by analogy. The surface of the spherical metal shell 3 is provided with twelve round holes, the size of the round holes is equivalent to the size of the speaker unit, and the paper cone flange 11 of the speaker unit...

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Abstract

The invention relates to a spherical regular dodecahedron sound source used for near-field HRTF measurement and a design method thereof. The sound source comprises a spherical metal shell and twelve speaker units which are uniformly distributed on the inner side of the spherical metal shell; every three speaker units are positioned on the same latitude plane of the spherical metal shell; and every four speaker units are connected in series, and three groups of serially connected speaker units are connected in parallel. The sound source can weaken the diffraction effect of the surface edges and planer structure of the sound source on sound waves, reduce the multiple scattering of the sound source and improve the high-frequency non-directional characteristic of the sound source radiated sound waves, and has enough wide frequency response range to meet the requirement of near-field HRTF measurement.

Description

technical field [0001] The invention relates to the field of electroacoustic technology, in particular to a spherical regular dodecahedron sound source and a design method for near-field HRTF measurement. Background technique [0002] Head-related transfer function (Head-related Transfer Function, HRTF) is the acoustic transfer function from point sound source to binaural under free-field conditions, which has important significance in the study of binaural hearing and the application of virtual surround sound. When the distance from the sound source to the center of the head is greater than 1.0m, it is called far-field HRTF; when the distance is less than 1.0m, it is called near-field HRTF. Experimental measurement is the most effective way to obtain HRTF. But the ideal point sound source does not exist, and the measurement can only be replaced by some sound sources with similar physical characteristics. The sound source actually used should be approximately non-direction...

Claims

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Application Information

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IPC IPC(8): H04R23/00H04R31/00
CPCH04R1/403H04S2420/01
Inventor 余光正谢菠荪饶丹俞锦元
Owner SOUTH CHINA UNIV OF TECH
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