Method for distance modulation of three-dimensional audio system

A technology of three-dimensional audio and modulation methods, applied in stereo systems, speech analysis, instruments, etc., can solve problems such as loss of distance perception in multi-channel audio systems

Active Publication Date: 2013-04-03
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the loss of distance perception in the existing multi-channel audio system, the present invention proposes a technical method capable of restoring and reproducing the distance perception in the sound field

Method used

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  • Method for distance modulation of three-dimensional audio system
  • Method for distance modulation of three-dimensional audio system
  • Method for distance modulation of three-dimensional audio system

Examples

Experimental program
Comparison scheme
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Embodiment

[0050] An embodiment employs the following sub-steps:

[0051] Step 4.1 Calculate the sound pressure at the center point and the binaural sound pressure.

[0052] In an N multi-channel three-dimensional audio system, calculate the sound pressure p received at the center point and the sound pressure p received by both ears L ,p R ,like image 3 . The calculation process is as follows. where d i Indicates the distance from the i-th speaker to the center point, d Li Indicates the distance from the ith speaker to the left ear, d Ri Indicates the distance from the ith speaker to the right ear, W i Indicates the power of the i-th speaker, w i Indicates the weight of the power of the i-th speaker, and N indicates the number of speakers. The calculation simulation diagram is as follows image 3 , Figure 4 shown.

[0053] P = 100 π Σ i = ...

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Abstract

The invention relates to a method for distance modulation of a three-dimensional audio system. The method comprises steps of simplifying M channels of multi-channel 3-dimentional audio signals to N channels of multi-channel 3-dimentional audio signals, calculating the distance between the virtual acoustic image and the listening point in a multi-channel system, calculating acoustic features at the center point position, which includes the sound pressure, the particle velocity and the binaural sound pressure which are received by the center point position, establishing an optimized-distance module, and distributing speaker signals to recovery distance perception again. Based on part of principle in the basic acoustics, the theoretical basis is perfect, the calculation cost is low, the original distance perception can be restored, and the method can be applied to various simple speaker systems.

Description

technical field [0001] The invention belongs to the field of acoustics, in particular to the simplification and optimization technology of a multi-channel three-dimensional audio system. Background technique [0002] The traditional 5.1 channel is to create a sense of envelopment rather than positioning, so the number of side speakers is small, and the sound image position is unstable. Therefore, the Japan Broadcasting Association and Japan's largest Media organization NHK (Nippon NHK) Science and Technology Research Laboratory officially proposed a 22.2 multi-channel prototype system in 2004, and included the system in the three-dimensional audio standard for the next generation of ultra-high-definition television. The Japan Broadcasting Association set up the speaker array in the system as a three-layer structure to achieve a three-dimensional immersion effect. The distance between the middle layer and the lower layer is 2 meters, and the distance between the upper layer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/008H04S3/00
Inventor 胡瑞敏张茂胜王实涂卫平王晓晨王松李登实姜林
Owner WUHAN UNIV
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