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Method and apparatus for compressing and decompressing higher order ambisonic representations of sound fields

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

Active Publication Date: 2019-02-19
DOLBY INT AB
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  • Summary
  • 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

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  • Method and apparatus for compressing and decompressing higher order ambisonic representations of sound fields
  • Method and apparatus for compressing and decompressing higher order ambisonic representations of sound fields
  • Method and apparatus for compressing and decompressing higher order ambisonic representations of sound fields

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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 each signal is described in the Detailed Description of HOA Decomposition and Reconstitution section. A frame-by-frame process of compression for non-overlapping input frames D(k) of length B sequences of HOA coefficients 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 directional sig...

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Abstract

The present invention improves HOA sound field representation compression. The HOA representation is analyzed for the presence of a dominant sound source and the direction of the dominant sound source is estimated. Then, the HOA representation is decomposed into multiple dominant orientation signals and residual components. This residual component is transformed to the discrete spatial domain in order to obtain the total plane wave function in uniformly sampled directions predicted from the dominant orientation signal. Finally, the prediction error is transformed back into the HOA domain and represents the residual ambient HOA component for which order reduction is performed, followed by perceptual coding of the dominant orientation signal 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 loudspeakers, compared to the WFS approach where the number of required loudspeakers is usually large. A further advantage of the HOA is that the same representation can also be used without any modification to the binaural presentati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L19/008H04S3/00H04H20/89
CPCH04S3/008H04S2420/11G10L19/008H04S7/302H04S2400/01H04H20/89
Inventor 亚历山大·克鲁格斯文·科登约翰内斯·伯姆
Owner DOLBY INT AB