Method and device for decorrelation and upmixing of audio channels
AssigneesKoninklijke Philips Electronics N.V., Coding Technologies AB
InventorsDirk Jeroen Breebaart, Erik Gosuinus Petrus Schuijers, Heiko Purnhagen, Karl Jonas Rödén
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Abstract
A device (1) for converting a first number (M) of input audio channels into a second, larger number (N) of output audio channels comprises: decorrelation units (3) for decomposing the input audio channels into a set of decorrelated auxiliary channels, at least one upmix unit (4) for combining the decorrelated auxiliary channels into the output audio channels, and at least one pre-processing unit (2) for pre-processing the input audio channels and feeding the pre-processed input audio channels to the decorrelation units (3). The pre-processing unit (2) and the upmix unit (4) are preferably controlled by audio parameters.
Claims13
A device for converting a first number of input audio channels into a second number of output audio channels, where the first number is smaller than the second number, the device comprising:
- at least one decorrelation unit for producing a set of decorrelated auxiliary channels from an input audio channel, the set of decorrelated auxiliary channels including one or more decorrelated auxiliary channels;
- and
- at least one upmix unit for combining channels into output audio channels, wherein the at least one upmix unit is operative to combine an input audio channel or a pre-processed input audio channel and a decorrelated auxiliary channel based on a time-varying inter-channel cross correlation parameter, said device further comprising:
- at least one pre-processing unit for pre-processing the input audio channel prior to feeding the input audio channel to the at least one decorrelation unit, wherein the at least one pre-processing unit is operative to perform a time-varying signal processing other than setting correlations,
- wherein the at least one decorrelation unit, the at least one upmix unit or the at least one pre-processing unit is implemented by a computer.
A method of converting a first number of input audio channels into a second number of output audio channels, where the first number is smaller than the second number, the method comprising:
- producing a set of decorrelated auxiliary channels from an input audio channel, the set of decorrelated auxiliary channels including one or more decorrelated auxiliary channels;
- and
- combining channels into output audio channels, wherein the combining comprising combining an input audio channel or a pre-processed input audio channel and a decorrelated auxiliary channel based on a time-varying inter-channel cross correlation parameter, said method additionally comprising:
- pre-processing the input audio channel prior to the producing the set of decorrelated auxiliary channels from the input audio channel, wherein the pre-processing comprises performing a time-varying signal processing other than setting correlations,
- wherein the producing, combining, or pre-processing is performed using a processor.
Dependencies are inferred from the claim text.