Patent ID: 8155971

Claim:
An audio decoder for decoding a multi-audio-object signal comprising an audio signal of a first type and an audio signal of a second type encoded therein, the multi-audio-object signal comprising a downmix signal and side information, the side information comprising level information of the audio signal of the first type and the audio signal of the second type in a first predetermined time/frequency resolution and a residual signal res specifying residual level values in a second predetermined time/frequency resolution, the audio decoder comprising: a processor configured to compute a prediction coefficient matrix C based on the level information; and an up-mixer configured to up-mix the downmix signal based on the prediction coefficients to acquire a first up-mix audio signal approximating the audio signal of the first type and/or a second up-mix audio signal approximating the audio signal of the second type, wherein the up-mixer is configured to yield the first up-mix audio signal S 1 and/or the second up-mix audio signal S 2 from the downmix signal d according to a computation represented by ( S 1 S 2 ) = D - 1 ⁡ ( 1 0 C 1 ) ⁢ ( d res ) , where the “1” denotes, depending on a number of channels of d, a scalar, or an identity matrix, and D −1 is a matrix uniquely determined by a downmix prescription according to which the audio signal of the first type and the audio signal of the second type are downmixed into the downmix signal, and which also includes the side information.