AES Europe 2026

This paper presents a method for extracting a center signal
from two-channel stereo signals for upmixing;
reproduction with additional center loudspeakers.
It uses a generative adversarial network with a generator
trained with multiple reconstruction losses; adversarial
losses obtained from a discriminator.
The processing is of low computationally complexity, causal
; can be configured for latencies down to one audio frame
of 46 ms length.
It is described how training data are created using only
publicly available signals; how the generation of target
data enables to control the attenuation of diffuse signals
; direct signals panned off-center.
An evaluation with listening test; computational metrics
SI-SDR; F2 measure is presented.
It shows an advantage compared to methods based on
classical signal processing in terms of computational
metrics for source separation; listeners preference.