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Audio encoders and decoders that utilize loudness to process state metadata

A technology of loudness processing status and metadata, applied in digital/encoded signal combination control, digital signal tone/bandwidth control, instruments, etc., can solve problems such as negative impact on listening experience quality, wrong DIALNORM value, error and so on

Active Publication Date: 2017-10-13
DOLBY LAB LICENSING CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This default value can be quite different from the actual session loudness level of the audio
Second, even if the content producer measures loudness and sets the DIALNORM value accordingly, it is possible to use a loudness measurement algorithm or meter that does not adhere to the recommended AC-3 loudness measurement method, resulting in an incorrect DIALNORM value
Third, even if an AC-3 bitstream has been generated with a correctly measured and set DIALNORM value by the content generator, it may have been changed to an incorrect value during transmission and / or storage of the bitstream
Therefore, the DIALNORM value included in the AC-3 bitstream may be incorrect or inaccurate and thus may have a negative impact on the quality of the listening experience

Method used

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  • Audio encoders and decoders that utilize loudness to process state metadata
  • Audio encoders and decoders that utilize loudness to process state metadata
  • Audio encoders and decoders that utilize loudness to process state metadata

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Embodiment Construction

[0071]According to an exemplary embodiment of the present invention, Loudness Processing State Metadata (LPSM) is embedded in one or more reserved fields (or slots) of the metadata segment of an audio bitstream that is in other segments (audio data segment) also includes audio data. Typically, at least one segment of each frame of the bitstream comprises an LPSM and at least one other segment of the frame comprises corresponding audio data (ie audio data whose loudness processing state and loudness are indicated by the LPSM). In some embodiments, the amount of data for LPSM may be sufficiently small to be carried without affecting the bit rate allocated to carry the audio data.

[0072] Passing loudness processing state metadata in the audio data processing chain is particularly useful when two or more audio processing units need to work in tandem with each other throughout the processing chain (or content lifecycle). In cases where loudness processing state metadata is not i...

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Abstract

The present invention discloses an audio encoder and decoder that utilizes loudness to process state metadata. Specifically disclosed is an apparatus and method for generating an encoded audio bitstream by including Loudness Processing State Metadata (LPSM) in at least one segment of a frame of the bitstream and including in at least one other segment of the frame audio data to include loudness processing state metadata and audio data in an encoded audio bitstream, and for decoding such a bitstream including LPSM by extracting the LPSM, and typically also performing adaptive loudness processing on the audio data using the LPSM or At least one of authentication and / or verification of LPSM and / or audio data. Another aspect is an audio processing unit (such as an encoder, decoder or post-processor) configured (such as programmed) to perform any embodiment of the method described above or which includes a memory buffer storing At least one frame of an audio bitstream generated by any embodiment of the method.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to U.S. Provisional Patent Application No. 61 / 754,882, filed January 21, 2013, entitled "Audio Encoder and Decoder Using Loudness Processing State Metadata," inventors Michael Ward and Jeffrey Riedmiller right. technical field [0003] The present invention relates to audio signal processing, and more particularly, the present invention relates to encoding and decoding audio data bitstreams using metadata representing the state of loudness processing of audio content. Some embodiments of the present invention generate or decode as "Dolby Digital (AC-3)", "Dolby Digital Plus (Dolby Digital Plus) (enhanced AC-3 or E-AC-3)" or Audio data in one of formats known as "Dolby E". Background technique [0004] "Dolby," "Dolby Digital," "Dolby Digital Plus," and "Dolby E" are trademarks of Dolby Laboratories, Inc., a licensee company. Dolby Laboratories provides proprietary implementations of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L19/16
CPCG10L19/167H03G5/005H03G9/005H03G9/025
Inventor 杰弗里·里德米勒迈克尔·沃德
Owner DOLBY LAB LICENSING CORP