Coordinate definition method of sound field space

A sound field and space technology, applied in the field of coordinate definition of sound field space, can solve the problems of less choice, inflexible sound performance, lack of elasticity of sound objects, etc., to achieve convenient sound production, good sound performance, and high coding efficiency. Effect

Inactive Publication Date: 2016-08-24
NANJING QINGJIN INFORMATION TECH
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  • Abstract
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AI Technical Summary

Problems solved by technology

In this way, the positioning of the sound object is inflexible, and there are fewer options, so that the sound performance is not flexible enough.

Method used

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  • Coordinate definition method of sound field space
  • Coordinate definition method of sound field space
  • Coordinate definition method of sound field space

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Embodiment 1

[0027] Embodiment 1: Taking a cube to describe the sound field space as an example, a typical application is that loudspeakers are arranged on the boundary surface of the cube. The spatial coordinate definition of the sound object: define the coordinate origin as the center of the horizontal section, the height is flush with the ear of the sound engineer when listening, and let the x-axis point to the right (wall), and the y-axis points to the front (usually the screen), The z-axis points vertically upwards (roof).

[0028] The sound field space is represented by normalized coordinates, the maximum absolute coordinate value of the x-axis, y-axis and z-axis is 1, the shorter side of the z-axis is the ground, and its normalized absolute coordinate value is a (a<1), Then the 8 coordinates of this sound field space are:

[0029] (1, 1, 1) - indicates the upper right corner in front of the area;

[0030] (-1, 1, 1)——Indicates the upper left corner in front of the area;

[0031] ...

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Abstract

The invention discloses a coordinate definition method of a sound field space. A position with the same altitude as an ear of a mixer being carrying out monitoring at the center of a horizontal tangent plane of the sound field space is defined as an original point of a coordinate; an number axis that passes through the original point of the coordinate and is perpendicular to the horizontal tangent plane is defined as a Z axis, wherein the forward direction of the Z axis is arranged upwardly; two number axes that are perpendicular to each other and pass through the original point of the coordinate on the horizontal tangent plane are defined as an X axis and a Y axis respectively; a position coordinate of a sound object in the sound field space is defined as (x, y, z); an action region of the sound object is defined as (phi, theta, gamma), wherein the phi expresses an included angle between a projection of a connecting line between the sound object and the original line on an xoy plane and the x axis and the range is [0,2pi), the theta expresses an included angle between the connecting line between the sound object and the original line and the z axis, and the gamma is defined as an included angle between a conical surface generatrix and a central axis and describes the opening size of the conical surface and the range is [0, pi / 2]. With the provided method, the high-efficiency space expression and good sound field effect are realized.

Description

technical field [0001] The invention relates to the technical field of sound coding, in particular to a method for defining coordinates of a sound field space. Background technique [0002] With the rapid development of computing power and networks, audio recording, downmix editing, encoding, decoding, rendering and playback technologies that can represent real three-dimensional sound fields in film, television, music, games, virtual reality and network video applications, It has important application value. "Atmospheric sound" is a vivid description of the three-dimensional sound field. [0003] At present, MPEG has launched the three-dimensional sound coding technology of MPEG H, and Dolby has introduced the Atmos panoramic sound coding technology, both of which put forward the concept of sound object coding on the basis of traditional multi-channel signal coding. Among them, Dolby Atmos adopts the method of directly recording the three-dimensional movement trajectory of...

Claims

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Application Information

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IPC IPC(8): H04S7/00
CPCH04S7/302H04S7/305
Inventor 潘兴德吴超刚
Owner NANJING QINGJIN INFORMATION TECH
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