Method and device of generating virtual surround sound

A surround sound and ambient sound technology, applied in the field of signal processing, can solve the problems of large computational load, low BRIR quality, low virtual surround sound quality, etc. Effect

Inactive Publication Date: 2016-03-02
BEIJING TWIRLING IN TIME CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the BRIR generated manually still has the problem of low quality, which cannot be compared with the BRIR generated by real recording and offline room simulation tools.
[0008] Therefore,...

Method used

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  • Method and device of generating virtual surround sound
  • Method and device of generating virtual surround sound
  • Method and device of generating virtual surround sound

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Embodiment Construction

[0050] The present invention provides a method for generating virtual surround sound, which includes the following processing steps for audio objects:

[0051] (1) Obtain the user's head rotation angle through the head tracking device;

[0052] (2) According to the rotation angle, encode the audio object into a high-order (preferably 2nd or 3rd) B-format signal;

[0053] (3) Convert the B-format signal into a virtual speaker array signal; use a first-order B-format signal [W 1 X 1 Y 1 Z 1 ] T As an example, convert it into a virtual speaker array signal [L 1 L 2 …L N ] T The process is to perform the following operations:

[0054] L 1 L 2 · · L N = G w 1 G x 1 G y 1 G z 1 G w 2 G x 2 G y 2 G z 2 · · · · · · · · G w N G x N G y N G z N W 1 ...

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Abstract

The invention relates to a method and device of generating virtual surround sound. The method comprises environment sound and audio frequency object treatment flows. The environment sound treatment flow comprises first order B format signal input, spinning by a spin matrix, binaural transcoding based on a HRTF (Head-Related Transfer Function), and binaural output. The audio frequency object treatment flow comprises encoding one or more than one audio frequency object into a higher-order ambisonic signal, performing binaural transcoding based on BRIR (Binaural Room Impulse Response), performing binaural output, and respectively outputting environment sound and an audio frequency object after corresponding mixture according to left and right sound channels. The device comprises a head tracking means, an audio frequency object input module, an audio frequency object B format coding module, an audio frequency object virtual loudspeaker array signal generation module and an audio frequency object BRIR module. The method and device can effectively generate virtual surround sound with high quality, and are mainly used for cooperating with a virtual reality HMD (head-mounted display) to perform audio frequency stereo headphone playing.

Description

Technical field [0001] The invention relates to a method and device for generating virtual surround sound, in particular to a method and device for generating virtual surround sound using stereo headphones as a playback device, and belongs to the technical field of signal processing. Background technique [0002] When using virtual reality head-mounted display (HMD) to present content to users, virtual 3D audio technology is used to play audio content to users through stereo headphones. The purpose is to achieve an effect that makes users look like a speaker array. (Such as 5.1 or 7.1) Listen the same. [0003] When producing virtual reality audio content, several sound elements are usually required. First, the natural sound field (or environmental sound) needs to be recorded and played back. Second, you need to mix audio objects. Audio objects are described by a series of parameters (such as the sounds of birds), including different moments and positions in three-dimensional sp...

Claims

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Application Information

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IPC IPC(8): H04S5/00H04S3/00
CPCH04S5/005H04S3/004
Inventor 孙学京
Owner BEIJING TWIRLING IN TIME CO LTD
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