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AssigneeFraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.
InventorsJUERGEN HERRE, JOHANNES HILPERT, STEFAN GEYERSBERGER, ANDREAS HOELZER, CLAUS SPENGER
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In processing a multi-channel audio signal having at least three original channels, first and second downmix channels derived from the original channels are provided. For a selected original channel of the original channels, channel side information are calculated such that a downmix channel or a combined downmix channel including the first and second downmix channels, when weighted using the channel side information, results in an approximation of the selected original channel. The channel side information and the first and second downmix channels form output data to be transmitted to a low-level decoder, which only decodes the first and second downmix channels, or to a high-level decoder, which provides a full multi-channel audio signal based on the downmix channels and the channel side information. Since the channel side information occupy few bits only and since the decoder does not use dematrixing, an efficient and high quality multi-channel extension for stereo players and enhanced multi-channel players is acquired.
Apparatus for processing a multi-channel audio signal, the multi-channel audio signal comprising at least three original channels, comprising:
Method of processing a multi-channel audio signal, the multi-channel audio signal comprising at least three original channels, comprising:
Apparatus for inverse processing of input data, the input data comprising channel side information, a first downmix channel or a signal derived from the first downmix channel and a second downmix channel or a signal derived from the second downmix channel, wherein the first downmix channel and the second downmix channel are derived from at least three original channels of a multichannel audio signal, and wherein the channel side information are calculated such that a downmix channel or a combined downmix channel comprising the first downmix channel and the second downmix channel, when weighted using the channel side information, results in an approximation of the selected original channel, the apparatus comprising:
Method of inverse processing of input data, the input data comprising channel side information, a first downmix channel or a signal derived from the first downmix channel and a second downmix channel or a signal derived from the second downmix channel, wherein the first downmix channel and the second downmix channel are derived from at least three original channels of a multichannel audio signal, and wherein the channel side information are calculated such that a downmix channel or a combined downmix channel comprising the first downmix channel and the second downmix channel, when weighted using the channel side information, results in an approximation of the selected original channel, the method comprising:
A non-transitory digital storage medium having a computer program stored thereon to perform the method of processing a multi-channel audio signal, the multi-channel audio signal having at least three original channels, which method comprises:
A non-transitory digital storage medium having a computer program stored thereon to perform the method for inverse processing of input data, the input data comprising channel side information, a first downmix channel or a signal derived from the first downmix channel and a second downmix channel or a signal derived from the second downmix channel, wherein the first downmix channel and the second downmix channel are derived from at least three original channels of a multi-channel audio signal, and wherein the channel side information are calculated such that a downmix channel or a combined downmix channel comprising the first downmix channel and the second downmix channel, when weighted using the channel side information, results in an approximation of the selected original channel, which method comprises:
Dependencies are inferred from the claim text.