A Coding Method for Sound Object

A coding method and object technology, applied in stereo systems, electrical components, etc., can solve the problems of inflexible sound performance, lack of flexibility of sound objects, and few choices, and achieve perfect three-dimensional sound field, high-efficiency space representation, sound Create convenient effects

Active Publication Date: 2017-10-20
全景声(北京)智能科技有限公司
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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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  • A Coding Method for Sound Object
  • A Coding Method for Sound Object
  • A Coding Method for Sound Object

Examples

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Embodiment 1

[0025] 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 at the same level as the ear of the sound engineer when listening, and let the x-axis point to the right (wall), and the y-axis point to the front (usually the screen), The z-axis points vertically upwards (roof).

[0026] 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:

[0027] (1, 1, 1)——Indicates the upper right corner in front of the area;

[0028] (-1, 1, 1)——indicates the upper left corner in front of the area;

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Abstract

The invention discloses a coding method of a sound object. The method comprises: a sound object of sound field space is obtained; a position having the same altitude as the center of a connecting line of two ears of a mixer at the center of a horizontal tangent plane of the sound field space is used as an original point to establish a three-dimensional coordinate system; a position track of the sound object is divided by using a frame as a unit and each frame is divided into a plurality of blocks; a position coordinate of an ith block of the sound object is determined as (x(i), y(i), z(i)); an action region of the sound object is determined 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 method, the coordinate (x, y, z) of the sound object and the effective action region (phi, theta, gamma) are unified to one coordinate system, thereby realizing the high-efficiency space expression and the good sound field effect.

Description

technical field [0001] The invention relates to the technical field of sound coding, in particular to a sound object coding method. 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 the sound object, encodes t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04S7/00
CPCH04S7/302H04S7/305
Inventor 潘兴德吴超刚
Owner 全景声(北京)智能科技有限公司
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