Apparatus and method for synthesizing an output signal

Abstract

An apparatus for synthesizing a rendered output signal having a first audio channel and a second audio channel includes a decorrelator stage (356) for generating a decorrelator signal based on a downmix signal, and a combiner (364) for performing a weighted combination of the downmix signal and a decorrelated signal based on parametric audio object information (362), downmix information (354) andtarget rendering information (360). The combiner solves the problem of optimally combining matrixing with decorrelation for a high quality stereo scene reproduction of a number of individual audio objects using a multichannel downmix.

Description

technical field The invention relates to combining a presentation output signal such as a stereo output signal or an output signal with more audio signals based on available multi-channel downmix and additional control data. Specifically, the multi-channel downmix is ​​a downmix of multiple audio object signals. Background technique Recent developments in audio facilitate the reconstruction of multi-channel representations of audio signals based on stereo (or mono) signals and corresponding control data. These parametric surround coding methods usually involve a parametric approach. A parametric multi-channel audio codec (such as the MPEG Surround codec defined in ISO / IEC 23003-1 [1], [2]) reconstructs the M channel from the K transport data by using additional control data. The control data includes IID (Inter-Channel Intensity Difference) and ICC (Inter-Channel Coherence) based multi-channel signal parameterization. These parameters are usually extracted at the encoding...

Images