Signal decorrelation in an audio processing system

A processing system, decorrelation technology, applied in the field of signal processing

Active Publication Date: 2015-10-21
DOLBY LAB LICENSING CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Encoding additional data about the encoding process simplifies this deco...

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  • Signal decorrelation in an audio processing system
  • Signal decorrelation in an audio processing system
  • Signal decorrelation in an audio processing system

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Embodiment Construction

[0177] The following description is directed to certain implementations for the purpose of describing some of the innovative aspects of the disclosure and examples of contexts in which these innovative aspects may be implemented. However, the teachings herein can be applied in a variety of different ways. Although the examples provided in this application are primarily described in terms of the AC-3 audio codec and the enhanced AC-3 audio codec (also known as E-AC-3), the concepts presented herein are applicable to Other audio codecs, including but not limited to MPEG-2AAC and MPEG-4AAC. Furthermore, the described implementations may be embodied in various audio processing devices, including but not limited to encoders and / or decoders, which may be included in mobile phones, smartphones, tablets, stereo systems, televisions, DVD players , digital recording equipment, and various other devices. Accordingly, it is intended that the teachings of this disclosure be not limited t...

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Abstract

Audio processing methods may involve receiving audio data corresponding to a plurality of audio channels. The audio data may include a frequency domain representation corresponding to filterbank coefficients of an audio encoding or processing system. A decorrelation process may be performed with the same filterbank coefficients used by the audio encoding or processing system. The decorrelation process may be performed without converting coefficients of the frequency domain representation to another frequency domain or time domain representation. The decorrelation process may involve selective or signal-adaptive decorrelation of specific channels and/or specific frequency bands. The decorrelation process may involve applying a decorrelation filter to a portion of the received audio data to produce filtered audio data. The decorrelation process may involve using a non-hierarchal mixer to combine a direct portion of the received audio data with the filtered audio data according to spatial parameters.

Description

technical field [0001] The present disclosure relates to signal processing. Background technique [0002] The development of digital encoding and decoding processes for audio and video data continues to have a significant impact on the delivery of entertainment content. Despite the increase in the capacity of storage devices and the vast amount of available data being transported at increasingly high bandwidths, there continues to be pressure to minimize the amount of data to be stored and / or transmitted. Audio and video data are often transported together, and the bandwidth of the audio data is often constrained by the requirements of the video portion. [0003] Consequently, audio data is often encoded with high compression factors, sometimes 30:1 or higher. Since signal distortion increases with the amount of compression applied, there is a tradeoff between the fidelity of the decoded audio data and the efficiency of storing and / or transmitting the encoded data. [000...

Claims

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Application Information

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IPC IPC(8): G10L19/008G10L19/02H04S3/00H04S5/00
CPCG10L19/008G10L19/02H04S3/008H04S5/00G10L19/06G10L25/06
Inventor V·麦尔考特颜冠傑G·A·戴维森M·费勒斯M·S·维顿V·库玛
Owner DOLBY LAB LICENSING CORP
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