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Method and apparatus for compressing and decompressing higher order ambisonics representation for sound field

A high-order ambisonic reverberation and decompression technology, used in stereo systems, speech analysis, instruments, etc.

Active Publication Date: 2015-08-19
DOLBY INT AB
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The main problem for perceptual coding noise exposure is the high cross-correlation between the individual HOA coefficient sequences

Method used

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  • Method and apparatus for compressing and decompressing higher order ambisonics representation for sound field
  • Method and apparatus for compressing and decompressing higher order ambisonics representation for sound field
  • Method and apparatus for compressing and decompressing higher order ambisonics representation for sound field

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Embodiment Construction

[0046] compression process

[0047] The compression process according to the present invention consists in Figure 1a and Figure 1b Two sequential steps are shown in . The precise definition of the individual signals is described in the detailed description section of HOA decomposition and reconstruction. A frame-by-frame process of compression for non-overlapping input frames D(k) of length B HOA coefficient sequences is used, where k denotes the frame index. With respect to the sequence of HOA coefficients specified in Equation (42), a frame is defined as follows:

[0048] D(k):=[d((kB+1)T s )d((kB+2)T s )…d((kB+B)T s )] (1)

[0049] where T s Indicates the sampling period.

[0050] exist Figure 1a , the frame D(k) of the sequence of HOA coefficients is input to the dominant sound source direction estimation step or stage 11 which analyzes the HOA representation for the presence of the dominant directional signal and estimates the direction of the dominant direct...

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Abstract

The invention improves HOA sound field representation compression. The HOA representation is analysed for the presence of dominant sound sources and their directions are estimated. Then the HOA representation is decomposed into a number of dominant directional signals and a residual component. This residual component is transformed into the discrete spatial domain in order to obtain general plane wave functions at uniform sampling directions, which are predicted from the dominant directional signals. Finally, the prediction error is transformed back to the HOA domain and represents the residual ambient HOA component for which an order reduction is performed, followed by perceptual encoding of the dominant directional signals and the residual component.

Description

technical field [0001] The present invention relates to methods and devices for compressing and decompressing higher order ambisonic representations of sound fields. Background technique [0002] Higher-order ambisonics (denoted HOA) provide a way to represent three-dimensional stereophonic sound. Other techniques are wave field synthesis (WFS) or channel based methods like 22.2. Compared to channel-based approaches, HOA representation offers the advantage of being independent of specific loudspeaker configurations. However, this flexibility comes at the expense of the decoding process, which is required for playback of HOA representations on specific speaker configurations. HOA can also be provided for configurations that include only fewer speakers, compared to the WFS approach where the number of required speakers is typically large. A further advantage of the HOA is that the same representation can also be employed without any modification to the binaural presentation...

Claims

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Application Information

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IPC IPC(8): G10L19/008H04S3/00H04H20/89
CPCG10L19/008H04S3/008H04S2420/11H04S7/302H04S2400/01H04H20/89
Inventor 亚历山大·克鲁格斯文·科登约翰内斯·伯姆
Owner DOLBY INT AB
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