Multichannel audio coding
AssigneeDolby Laboratories Licensing Corporation
InventorMark Franklin Davis
Life of this patent
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Abstract
Multiple channels of audio are combined either to a monophonic composite signal or to multiple channels of audio along with related auxiliary information from which multiple channels of audio are reconstructed, including improved downmixing of multiple audio channels to a monophonic audio signal or to multiple audio channels and improved decorrelation of multiple audio channels derived from a monophonic audio channel or from multiple audio channels. Aspects of the disclosed invention are usable in audio encoders, decoders, encode/decode systems, downmixers, upmixers, and decorrelators.
Claims12
A method for decoding M encoded audio channels representing N audio channels, where N is two or more, and a set of one or more spatial parameters, the method comprising:
- a) receiving said M encoded audio channels and said set of spatial parameters,
- b) deriving N audio signals from said M encoded channels, wherein each audio signal is divided into a plurality of frequency bands, wherein each band comprises one or more spectral components, and
- c) generating a multichannel output signal from the N audio signals and the spatial parameters,
- whereby
- M is two or more,
- at least one of said N audio signals is a correlated signal derived from a weighted combination of at least two of said M encoded audio channels,
- said set of spatial parameters includes a first parameter indicative of the amount of an uncorrelated signal to mix with a correlated signal and
- step c) includes deriving at least one uncorrelated signal from said at least one correlated signal, and controlling the proportion of said at least one correlated signal to said at least one uncorrelated signal in at least one channel of said multichannel output signal in response to one or ones of said spatial parameters, wherein said controlling is at least partly in accordance with said first parameter.
Dependencies are inferred from the claim text.