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Virtual 3D replaying method based on earphone

A 3D and earphone technology, applied in the field of 3D speech reconstruction, which can solve the problems of inconspicuous "outside the head", unnatural spatial perception, and weak sense of distance.

Active Publication Date: 2012-09-12
INST OF ACOUSTICS CHINESE ACAD OF SCI +1
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Problems solved by technology

Therefore, when synthesizing virtual 3D effects, there are problems such as "outside of the head" is not obvious, the sense of distance is not strong, and the perception of space is unnatural.

Method used

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  • Virtual 3D replaying method based on earphone

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Embodiment Construction

[0019] The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0020] When the sound source is played through the speaker, people can more accurately perceive the direction, distance and room characteristics of the sound source outside the head. The present invention is to compensate the problem that the 3D effect is not obvious when playing back with the earphone according to the difference between the earphone playback and the loudspeaker playback. Specifically, technologies such as the characteristics of sound transmission in the air, the characteristics of wall-to-wall sound absorption, and the joint implementation of HRTF and image methods are added to solve the problem that the listener feels that the audio-image position is located inside the head during earphone playback. Headphone” problems, sense of distance and orientation, room characteristics and other issues, so as t...

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Abstract

The invention relates to a virtual 3D replaying method based on an earphone. The method comprises the following steps: setting a parameter of a virtual 3D sound source; calculating an absorption value of air to sound and calculating a sound pressure attenuation factor of the sound; calculating a room pulse response (RIR); calculating a position distance d between each sample point of the RIR and a receiving point, calculating a sound pressure of the original sound source after being transmitted for the d distance according to the d; using a interpolation method to process an absorption coefficient of a metope frequency point so as to obtain the RIR after increasing air attenuation and metope absorption; calculating a level angle and an elevation angle between a sound source point position and a head position so as to select a proximal head correlation transmission function; carrying out convolution on head-related transfer function (HRTF) and the RIR after increasing the air attenuation and the metope absorption so as to acquire binaural room pulse response (BRIR); carrying out the convolution on the BRIR and an input sound signal so as to realize a virtual 3D sound signal based on the earphone. By using the method provided in the invention, an '' inner head '' problem during earphone replaying, a distance direction feeling problem, a room characteristic problem and the like can be solved so as to realize a virtual 3D effect based on the earphone.

Description

technical field [0001] The invention relates to the field of 3D voice reconstruction, in particular to a headset-based virtual 3D replay method. Background technique [0002] The virtual 3D playback technology based on headphones is to simulate the sound field generated by a certain point in the space in the ears, so that the listener feels that the virtual sound source is emitted from the corresponding position in the space. This technology mainly uses Head-Related Transfer Function (Head-Related Transfer Function, HRTF) and the method of simulating room reverberation to virtualize the sound source at a certain point in the space. [0003] Head-related transfer function (HRTF) is a processing technology for sound localization. It is the transfer function between the sound source and the eardrum under free-field conditions, including the effects of the head, auricle, and shoulders on sound transmission. The synthesis of room reverberation often uses the image method, which ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R1/20H04R1/10
Inventor 李军锋夏日升付强颜永红
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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