Audio decoder, audio encoder, method for providing a decoded audio signal, method for providing an encoded audio signal, audio stream, audio stream provider and computer program using a stream identifier

Patent metadata

Field	Value
Publication number	US-11217260-B2
Application number	US-201916506863-A
Country	US
Kind code	B2
Filing date	Jul 9, 2019
Priority date	Jan 10, 2017
Publication date	Jan 4, 2022
Grant date	Jan 4, 2022

Abstract

An audio decoder for providing a decoded audio signal representation on the basis of an encoded audio signal representation is configured to adjust decoding parameters in dependence on a configuration information, to decode one or more audio frames using a current configuration information, to compare a configuration information in a configuration structure associated with one or more frames to be decoded by the current configuration information, and to make a transition to perform decoding using the configuration information in the configuration structure associated with the one or more frames to be decoded as a new configuration information if the configuration information in the configuration structure associated with the one or more frames to be decoded, or a relevant portion thereof, is different from the current configuration information, and to consider a stream identifier information included in the configuration structure when comparing the configuration information.

First claim

The invention claimed is:

1. An audio decoder for providing a decoded audio signal representation on the basis of an encoded audio signal representation,
wherein the audio decoder is configured to adjust decoding parameters in dependence on a configuration information,
wherein the audio decoder is configured to decode one or more audio frames using a current configuration information, and
wherein the audio decoder is configured to compare a configuration information in a configuration structure associated with one or more frames to be decoded, with the current configuration information, and to make a transition to perform a decoding using the configuration information in the configuration structure associated with the one or more frames to be decoded as a new configuration information if the configuration information in the configuration structure associated with the one or more frames to be decoded, or a relevant portion of the configuration information in the configuration structure associated with the one or more frames to be decoded, is different from the current configuration information;
wherein the audio decoder is configured to consider a stream identifier information comprised by the configuration structure when comparing the configuration information, such that a difference between a stream identifier previously acquired by the audio decoder and a stream identifier represented by the stream identifier information in the configuration structure associated with the one or more frames to be decoded causes to make the transition.

2. The audio decoder according to claim 1 , wherein the audio decoder is configured to check whether the configuration structure comprises the stream identifier information, and to selectively consider the stream identifier information in the comparison if the stream identifier information is comprised by the configuration structure.

3. The audio decoder according to claim 1 , wherein the audio decoder is configured to check whether the configuration structure comprises a configuration extension structure, and to check whether the configuration extension structure comprises the stream identifier information, and
wherein the audio decoder is configured to selectively consider the stream identifier information in the comparison if the stream identifier information is comprised by the configuration extension structure.

4. The audio decoder according to claim 3 , wherein the audio decoder is configured to accept a variable ordering of configuration information items in the configuration extension structure, and
wherein the audio decoder is configured to consider configuration information items arranged in the configuration extension structure before the stream identifier information when comparing the configuration information in the configuration structure associated with one or more frames to be decoded with the current configuration information, and
wherein the audio decoder is configured to leave configuration information items arranged in the configuration extension structure after the stream identifier information unconsidered when comparing the configuration information in the configuration structure associated with one or more frames to be decoded with the current configuration information.

5. The audio decoder according to claim 4 ,
wherein the audio decoder is configured to identify one or more configuration information items in the configuration extension structure on the basis of one or more configuration extension type identifiers preceding the respective configuration information items.

6. The audio decoder according to claim 3 , wherein the configuration extension structure is a sub-data-structure of the configuration structure, wherein a presence of the configuration extension structure is indicated by a bitof the configuration structure which is evaluated by the audio decoder, and
wherein the stream identifier information is an sub-data-item of the configuration extension structure,
wherein a presence of the stream identifier information is indicated by a configuration extension type identifier associated with the stream identifier information which is evaluated by the audio decoder.

7. The audio decoder according to claim 1 ,
wherein the audio decoder is configured to achieve and process an audio frame representation which comprises a random access information,
wherein the random access information comprises a configuration structure and information for bringing a state of a processing chain of the audio decoder to a desired state,
wherein the audio decoder is configured to cross-fade between an audio information represented by an audio frame processed before arriving at the audio frame representation which comprises the random access information and an audio information derived on the basis of the audio frame representation which comprises the random access information after an initialization of the audio decoder using the configuration structure of the random access information and after adjusting a state of the audio decoder using the information for bringing a state of the processing chain to a desired state if the audio decoder finds that the configuration information in the configuration structure of the random access information, or a relevant portion of the configuration information in the configuration structure of the random access information, is different from the current configuration information.

8. The audio decoder according to claim 7 , wherein the audio decoder is configured to continue decoding without performing a initialization of the audio decoder and without using the information for bringing a state of the processing chain of the audio decoder to a desired state if the audio decoder has decoded an audio frame directly preceding an audio frame represented by the audio frame representation which comprises the random access information and if the audio decoder finds that the relevant portion of the configuration information in the configuration structure of the random access information is equal to the current configuration information.

9. The audio decoder according to claim 7 , wherein the audio decoder is configured to perform an initialization of the audio decoder using the configuration structure of the random access information and to adjust a state of the audio decoder using the information for bringing a state of the processing chain to a desired state if the audio decoder has not decoded an audio frame directly preceding an audio frame represented by the an audio frame representation which comprises the random access information.

10. A method for providing a decoded audio signal representation on the basis of an encoded audio signal representation,
wherein the method comprises adjusting decoding parameters in dependence on a configuration information,
wherein the method comprises decoding one or more audio frames using a current configuration information, and
wherein the method comprises comparing a configuration information in a configuration structure associated with one or more frames to be decoded, with the current configuration information, and wherein the method comprises making a transition to perform a decoding using the configuration information in the configuration structure associated with the one or more frames to be decoded as a new configuration information if the configuration information in the configuration structure associated with the one or more frames to be decoded, or a relevant portion of the configuration information in the configuration structure associated with the one or more frames to be decoded, is different from the current configuration information;
wherein the method comprises considering a stream identifi

Assignees

• Fraunhofer Ges Forschung

Inventors

• Neuendorf Max
• Felix Matthias
• Hildenbrand Matthias
• Schuster Lukas
• Hofmann Ingo
• Herrmann Bernd
• Rettelbach Nikolaus

Classifications

• 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

• G10L19/173

  Transcoding, i.e. converting between two coded representations avoiding cascaded coding-decoding · CPC title

• G10L19/22 Primary

  Mode decision, i.e. based on audio signal content versus external parameters · CPC title

• G10L19/0017 Primary

  Lossless audio signal coding; Perfect reconstruction of coded audio signal by transmission of coding error (G10L19/24 takes precedence) · CPC title

• G10L19/008

  Multichannel audio signal coding or decoding using interchannel correlation to reduce redundancy, e.g. joint-stereo, intensity-coding or matrixing · CPC title