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Controlling spatial audio coding parameters as a function of auditory events

An auditory event and audio coding technology, applied in speech analysis, electrical components, stereo systems, etc., can solve the problems of loss of practical application of audio scene analysis, excessive computing requirements, etc.

Inactive Publication Date: 2009-04-15
DOLBY LAB LICENSING CORP
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Problems solved by technology

However, the Bhadkamkar et al. patent loses confidence in the practical application of audio context analysis and leads to the conclusion that, despite scientific interest regarding audio context analysis as a model of human sound processing, currently, in Without significant advances, it is too computationally demanding to be considered a practical technique for sound separation

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  • Controlling spatial audio coding parameters as a function of auditory events
  • Controlling spatial audio coding parameters as a function of auditory events
  • Controlling spatial audio coding parameters as a function of auditory events

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Embodiment Construction

[0024] Some examples of spatial encoders incorporating aspects of the invention are figure 1 , as shown in 2 and 3. Generally speaking, a spatial encoder takes N original audio signals or channels and down-mixes them into a composite signal containing M signals or channels, where M<N. In general, N=6 (5.1 audio), M=1 or 2. At the same time, a low data rate sidechain signal for describing perceptually significant spatial cues between multiple channels is extracted from the original multi-channel signal. Then, the composite signal can be encoded by an existing audio encoder (eg, MPEG-2 / 4AAC encoder) and encapsulated with spatial side chain information. At the decoder, the composite signal is decoded and upmixed to an approximation of the original multi-channel signal using the decapsulated sidechain information. Alternatively, the decoder can ignore the side chain information and only output the composite signal.

[0025] Spatial coding systems proposed in several recent tec...

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Abstract

An audio encoder or encoding method receives a plurality of input channels and generates one or more audio output channels and one or more parameters describing desired spatial relationships among a plurality of audio channels that may be derived from the one or more audio output channels, by detecting changes in signal characteristics with respect to time in one or more of the plurality of audio input channels, identifying as auditory event boundaries changes in signal characteristics with respect to time in the one or more of the plurality of audio input channels, an audio segment between consecutive boundaries constituting an auditory event in the channel or channels, and generating all or some of the one or more parameters at least partly in response to auditory events and / or the degree of change in signal characteristics associated with the auditory event boundaries. An auditory-event-responsive audio upmixer or upmixing method is also disclosed.

Description

technical field [0001] The present invention relates to audio coding methods and devices in which an encoder downmixes a plurality of audio channels to a smaller number of audio channels, generating one or more parameters (all or some of them). The invention also relates to an audio method and device for upmixing a plurality of audio channels to a greater number of audio channels as a function of auditory events. The invention also relates to a computer program for implementing such a method or controlling such a device. Background technique [0002] spatial coding [0003] Certain finite-bit-rate digital audio coding techniques analyze an input multi-channel signal to derive a "down-mixed" composite signal (a signal containing fewer channels than the input signal) and side information containing a parametric model of the original sound field . The side information (side chains) and the composite signal (e.g., coded by lossy and / or lossless bitrate reduction coding) can ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/00H04S3/00
CPCG10L19/008H04S2420/03H04S3/008G10L19/08
Inventor 艾伦·J·西弗尔特马克·S·文顿
Owner DOLBY LAB LICENSING CORP
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