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Low-complexity audio matrix decoder

A technology for matrixing, audio signals, used in stereo systems, electrical components, etc.

Active Publication Date: 2012-02-15
DOLBY LAB LICENSING CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Although existing matrix decoders, such as Dolby Pro Logic II and its predecessor, Pro Logic, are useful for matching the two-channel stereo audio output of low-cost devices to Multichannel surround sound input to a Dolby Headphone virtualizer, but existing matrix decoders are often more complex and resource intensive than some low-cost devices might expect

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Embodiment Construction

[0048] Various aspects of the present invention can be better understood by combining the exemplary embodiments. For convenience of description, the embodiments can be divided into four stages. In the case of an adaptive matrix audio decoder or decoding process, the overall relationship of the 4 stages is as Figure 16 Shown: receive m input audio signals, in this example 2 signals Lin and Rin, output n audio signals, in this example 4 signals LOut (left output), ROut (right output), LsOut ( left surround output) and RsOut (right surround output). The decoder or decoding process has a control path comprising stages 1, 2 and 3 and a signal path comprising the adaptive matrix or matrixing process in stage 4. A plurality of time-varying control signals, in this example 4 control signals, are generated through the control path and applied to the adaptive matrixing or matrixing process.

[0049] stage 1

[0050] First look at stage 1, such as figure 1 As shown, m audio input s...

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Abstract

Deriving n audio output signals from m audio input signals, where m and n are positive whole integers and the n audio output signals are derived using an adaptive matrix or matrixing process responsive to one or more control signals, which matrix or matrixing process produces n audio signals in response to m audio signals, and (b) deriving a plurality of time- varying control signals from the m audio input signals, wherein the control signals are derived from the m input audio signals using (i) a processor or process that produces a plurality of directional dominance signals in response to the m audio input signals, at least one directional dominance signal relating to a first directional axis and at least one other directional dominance signal relating to a second directional axis, and (ii) a processor or process that produces the control signals in response to the directional dominance signals.

Description

technical field [0001] The present invention relates to audio signal processing. More specifically, the present invention relates to a low complexity adaptive audio matrix decoder or decoding process that can be used to decode encoded and unencoded input signals. Although usable as a stand-alone decoder or decoding process, the decoder or decoding process can advantageously be used in conjunction with a "virtualizer" or "virtualization" process such that the decoder or decoding process provides multi-channel input to the virtualizer or virtualization process. The invention also relates to a computer program stored on a computer readable medium for causing a computer to perform a decoding process or a decoding and virtualization process according to aspects of the invention. [0002] citation terms [0003] Each patent, published patent application, and reference cited herein is hereby incorporated by reference in its entirety. Background technique [0004] "Virtual head...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04S3/02
CPCH04S3/02
Inventor 陈庆伟C·查巴尼
Owner DOLBY LAB LICENSING CORP