Patent ID: 8280744
Filing Date: 2012-10-02
Classification: G10L,H04S

Abstract:
1. 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 specifying residual level values in a second predetermined time/frequency resolution, the audio decoder comprising a processor for computing prediction coefficients based on the level information; and an up-mixer for up-mixing the downmix signal based on the prediction coefficients and the residual signal 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 processor for computing prediction coefficients based on the level information is configured to compute channel prediction coefficients c with with OLD and with OLD with where DCLD the up-mixer is configured to yield the first up-mix signal S where the “1” in the top left-hand corner denotes—depending on the number of channels of d the “1” in the bottom right-hand corner is a scalar, “0” denotes—depending on the number of channels of d n,k —a zero vector or a scalar 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 is also comprised by the side information, and d n,k and res n,k denote the downmix signal and the residual signal at time/frequency tile (n,k), respectively.