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A method for encoding dynamic range control drc gain value

A gain value and encoding technology, applied in the compression/expansion of digital/encoded signal volume, in the compression/expansion of non-tuned/low-frequency amplifier volume, speech analysis, etc., can solve problems such as aliasing and distortion with limited time resolution

Active Publication Date: 2018-12-04
APPLE INC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Advanced Audio Coding (AAC) combined with DRC tools, but this DRC tool has disadvantages including limited temporal resolution and aliasing artifacts

Method used

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  • A method for encoding dynamic range control drc gain value
  • A method for encoding dynamic range control drc gain value
  • A method for encoding dynamic range control drc gain value

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Embodiment Construction

[0020] Several embodiments of the invention will now be explained with reference to the accompanying drawings. Whenever the shapes, relative positions, and other aspects of components described in the embodiments are not clearly defined, the scope of the present invention is not limited only to the illustrated components, which are for illustration purposes only. Additionally, while numerous details are set forth, it is understood that some embodiments of the invention may be practiced without these details. In other instances, well-known circuits, structures and techniques have not been shown in detail in order not to obscure the understanding of this detailed description.

[0021] Metadata systems that incorporate dynamic range control / compression (DRC) metadata into the bitstream / format offer several advantages over systems where DRC gain values ​​are determined at the listener end (ie, at playback). These advantages include (1) lower complexity at playback of the audio si...

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Abstract

The present invention describes a system for encoding and applying dynamic range control / compression (DRC) gain values ​​to a piece of sound program content. Specifically, a set of DRC gain values ​​representing a DRC gain curve of a piece of content may be divided into several frames corresponding to the frames of the piece of content. A set of fields may be included with an audio signal representing a piece of content. An additional field may represent the DRC gain value using linear interpolation or spline interpolation. Additional fields may include: 1) an initial gain value for each DRC frame, 2) a set of slope values ​​at specific points in the DRC curve, 3) a set of time increment values ​​for each pair of consecutive slope values, and / or 4) one or more gain increment values ​​representing the change in DRC gain value in the DRC gain curve between points of slope value.

Description

[0001] Related questions [0002] This patent application claims U.S. Provisional Patent Application 61 / 806,628, filed March 29, 2013; U.S. Provisional Patent Application 61 / 857,966, filed July 24, 2013; and U.S. Provisional Patent Application Benefit of earlier filing date of patent application 61 / 891,687. technical field [0003] Embodiments of the invention generally relate to a system and method for encoding and applying dynamic range control / compression (DRC) to an audio signal. Furthermore, the systems and methods described herein take into account the DRC requirements of new codecs in development in MPEG-H (3D audio). Other embodiments are also described. Background technique [0004] Dynamic range control / compression (DRC) works by (1) making soft parts of an audio signal louder; (2) making loud parts of an audio signal soft; or (3) simultaneously making soft parts louder and loud parts louder. Soft to somewhat reduce the dynamic range of the audio signal. Reduce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L19/16G10L19/008
CPCG10L19/167H03G7/002H03G7/007G10L19/008G10L19/02G10L19/032
Inventor F·M·鲍姆加特
Owner APPLE INC
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