![]() Audio encoder in accordance with claim 1, in which multiple pairs of channels are encoded, wherein for each pair of channels a spatial parameter, a downmix signal and a residual signal is derived.ġ6. Audio encoder in accordance with claim 13, in which the output interface is operative to multiplex the processed downmix signal, the processed residual signal, and the processed spatial parameter to derive the output bit stream.ġ5. Audio encoder in accordance with claim 12, in which the output interface is operative to combine the processed downmix signal, the processed residual signal, and the processed spatial parameter to derive an output bit stream having the information of the processed downmix signal, the processed residual signal and the processed parameter.ġ4. Audio encoder in accordance with claim 10, further comprising an output interface for providing the information of the processed downmix signal, the processed residual signal, and the processed spatial parameter.ġ3. Audio encoder in accordance with claim 10, in which the signal processing unit is operative to derive the processed downmix signal, the processed residual signal, and the processed parameter such that the deriving includes a compression of the downmix signal, the residual signal, and the spatial parameter.ġ2. Audio encoder in accordance with claim 1, further comprising a signal processing unit for processing or transmitting the downmix signal, the residual signal, and the spatial parameter to derive a processed downmix signal, a processed residual signal, and a processed parameter.ġ1. Audio encoder in accordance with claim 8, in which the parameter extractor is operative to derive an ICC parameter describing the coherence between the first and the second channel of the at least two channels and an IID parameter describing a level difference between the first and the second channel and in which the down-mixing rule is such that the deriving of the downmix signal m and the residual signal s can be described by the following equation, depending on the ICC and IID parameters: m = IID 2 + 1 IID 2 + 1 + 2 ġ0. Audio encoder in accordance with claim 1, in which the down-mixer is operative to use a down-mixing rule such that the downmix signal and the residual signal are derived by forming a linear combination of the channels from the at least two channels, wherein the coefficients of the linear combination are depending on the limited spatial parameter.ĩ. Audio encoder in accordance with claim 6, in which the predefined gain factor g 0 is chosen from the interval. Audio encoder in accordance with claim 5, in which the limiting rule is such that a lower limit for the ICC parameter, depending on a predefined gain factor g 0 and the IID parameter, can be described by the following expression: ICC ≥ 1 2 ħ. ![]() Audio encoder in accordance with claim 3, in which the limiter is operative to limit the ICC parameter such that a gain factor describing a ratio of intensities between the downmix signal and the at least two channels does not exceed a predefined limit, wherein the limit of the ICC parameter depends on the IID parameter.Ħ. ![]() Audio encoder in accordance with claim 1, in which the limiter is operative to limit the spatial parameter such that a gain factor describing a ratio of intensities between the downmix signal and the at least two channels does not exceed a predefined limit.ĥ. Audio encoder in accordance with claim 1, in which the parameter extractor is operative to derive an ICC parameter describing a coherence between a first and a second channel of the at least two channels and an IID parameter describing a level difference between the first and the second channel.Ĥ. Audio encoder in accordance with claim 1, in which the parameter extractor is operative to derive multiple spatial parameters for a given time portion of the audio signal, wherein each spatial parameter describes the interrelation of the at least two channels for a predefined frequency interval.ģ. Audio encoder for encoding an audio signal having at least two channels, comprising: a parameter extractor for deriving a spatial parameter from the audio signal, wherein the spatial parameter describes an interrelation between the at least two channels a limiter for limiting the spatial parameter using a limiting rule to derive a limited spatial parameter, wherein the limiting rule depends on an interrelation between the at least two channels and a down-mixer for deriving a downmix signal and a residual signal from the audio signal using a down-mixing rule depending on the limited spatial parameter.Ģ.
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