Decoding audio bitstreams with enhanced spectral band replication metadata in at least one fill element

Patent metadata

Field	Value
Publication number	US-12260869-B2
Application number	US-202418633112-A
Country	US
Kind code	B2
Filing date	Apr 11, 2024
Priority date	Mar 13, 2015
Publication date	Mar 25, 2025
Grant date	Mar 25, 2025

Abstract

Embodiments relate to an audio processing unit that includes a buffer, bitstream payload deformatter, and a decoding subsystem. The buffer stores at least one block of an encoded audio bitstream. The block includes a fill element that begins with an identifier followed by fill data. The fill data includes at least one flag identifying whether enhanced spectral band replication (eSBR) processing is to be performed on audio content of the block. A corresponding method for decoding an encoded audio bitstream is also provided.

First claim

What is claimed is:

1. An audio processing device comprising:
a decoding subsystem configured to decode at least a portion of a block of an encoded audio bitstream, wherein the block of the encoded audio bitstream includes:
a fill element with an identifier indicating a start of the fill element and fill data after the identifier, wherein the fill data includes an extension payload, the extension payload includes spectral band replication extension data, and the extension payload is identified with a four bit unsigned integer transmitted most significant bit first and having a value of ‘1101’ or ‘1110’, and, wherein the spectral band replication extension data includes:
a spectral band replication header, spectral band replication data, and
wherein the extension payload further includes a spectral band replication extension element after the spectral band replication data, and wherein the flag is included in the spectral band replication extension element,
wherein the fill data further includes:
at least one flag identifying whether enhanced spectral band replication processing is to be performed on audio content of the block of the encoded audio bitstream, and
enhanced spectral band replication metadata which does not include one or more parameters used for both spectral patching and harmonic transposition, wherein the enhanced spectral band replication metadata is metadata configured to enable at least one eSBR tool which is described or mentioned in the MPEG USAC standard and which is not described or mentioned in the MPEG-4 AAC standard.

2. A method for decoding an encoded audio bitstream, the method comprising:
decoding at least a portion of a block of an encoded audio bitstream,
wherein the block of the encoded audio bitstream includes:
a fill element with an identifier indicating a start of the fill element and fill data after the identifier, wherein the fill data includes an extension payload, the extension payload includes spectral band replication extension data, and the extension payload is identified with a four bit unsigned integer transmitted most significant bit first and having a value of ‘1101’ or ‘1110’, and, wherein the spectral band replication extension data includes:
a spectral band replication header, spectral band replication data, and
wherein the extension payload further includes a spectral band replication extension element, and wherein the flag is included in the spectral band replication extension element,
wherein the fill data further includes:
a flag identifying whether enhanced spectral band replication processing is to be performed on audio content of the block of the encoded audio bitstream, and
enhanced spectral band replication metadata which does not include one or more parameters used for both spectral patching and harmonic transposition, wherein the enhanced spectral band replication metadata is metadata configured to enable at least one eSBR tool which is described or mentioned in the MPEG USAC standard and which is not described or mentioned in the MPEG-4 AAC standard.

Assignees

• Dolby Int Ab

Inventors

• Villemoes Lars
• Purnhagen Heiko
• Ekstrand Per

Classifications

• G10L19/16

  Vocoder architecture · CPC title

• G10L21/038

  using band spreading techniques · CPC title

• G10L19/24 Primary

  Variable rate codecs, e.g. for generating different qualities using a scalable representation such as hierarchical encoding or layered encoding · CPC title

• G10L19/035

  Scalar quantisation · CPC title

• G10L19/167 Primary

  Audio streaming, i.e. formatting and decoding of an encoded audio signal representation into a data stream for transmission or storage purposes · CPC title