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Method for encoding audio signals, apparatus for encoding audio signals, method for decoding audio signals and apparatus for decoding audio signals

A coding and audio technology, applied in the field of coding audio signals, can solve problems such as in-depth research

Active Publication Date: 2016-01-20
DOLBY INT AB
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Problems solved by technology

[0002] Compression of Higher-Order Ambisonics (HOA) content has not been thoroughly studied in the scientific literature

Method used

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  • Method for encoding audio signals, apparatus for encoding audio signals, method for decoding audio signals and apparatus for decoding audio signals
  • Method for encoding audio signals, apparatus for encoding audio signals, method for decoding audio signals and apparatus for decoding audio signals
  • Method for encoding audio signals, apparatus for encoding audio signals, method for decoding audio signals and apparatus for decoding audio signals

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Embodiment Construction

[0030] The present invention provides an embedded coding scheme method for High Order Ambisonics (HOA) content. A very attractive application for this approach is the distribution / broadcasting of high-resolution spatial audio content via a bitstream that is backwards compatible with existing surroundsound decoders. Using an existing surround sound decoder, this bitstream decodes to regular surround sound, while the new, enhanced decoder is able to decode full 3D audio from the same bitstream. Thus, the "chicken-and-egg problem" that typically slows down large-scale deployment of new monolithic (or self-contained) content formats and corresponding decoder implementations significantly can be circumvented. The content provider can start distributing content of a new quality that still advantageously enjoys the basic support of the large number of decoders installed in the field (ie at potential customers).

[0031] The above applications are effectively addressed by layered cod...

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Abstract

The invention introduces a new concept for hierarchical coding of HOA content. A method for encoding a hierarchical audio bitstream comprises rendering a HOA input signal to surround sound, encoding the surround sound for a base layer output signal, decoding the encoded surround sound to obtain a reconstructed surround sound signal, performing dimensionality reduction on the received HOA input signal, calculating a residual between the dimensionality-reduced HOA signal and the reconstructed surround sound signal, encoding the residual signal,and multiplexing structural information about the HOA input signal, the encoded residuals and the encoded surround sound into a bitstream to obtain a hierarchical audio bitstream.

Description

technical field [0001] The invention relates to a method for encoding an audio signal, a device for encoding an audio signal, a method for decoding an audio signal and a device for decoding an audio signal. Background technique [0002] Compression of Higher-Order Ambisonics (HOA) content has not been thoroughly studied in the scientific literature. Accordingly, this section presents the overall architecture of an exemplary current technology for self-contained compression of HOA content. This architecture has been verified through extensive testing to enable high quality encoding of high resolution spatial sound scenes at medium (eg 256 kbit / s) to high (eg 1.5 Mbit / s) data rates. The background information provided in this section is necessary to understand the layering concepts built on top of this architecture. [0003] figure 1 The concept of self-contained HOA compression is shown from the encoder's perspective. It should be noted that the numbers and parameters pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/008G10L19/24
CPCG10L19/008G10L19/24G10L19/038H04S3/008H04S2420/11
Inventor 彼得·加克斯亚历山大·库鲁格尔
Owner DOLBY INT AB
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