Stereo Downmix in 3GPP IVAS for EVS Compatibility
Takehiro Moriya, Stéphane Ragot, Arnaud Lefort, Alexandre Guérin, Noboru Harada, Ryosuke Sugiura, Yutaka Kamamoto
Abstract
The 3GPP IVAS codec specifies an EVS-compatible stereo downmix as one of the key functionalities. This paper describes how this novel active downmix scheme has been devised to achieve high and stable quality from stereo input to EVS encoder/decoder with no additional algorithmic delay. An example of a network configuration for a multi-party conference using the proposed EVS-compatible downmix is also provided. This paper shows several fundamental schemes, of active processes, including adaptive weight and phase-compensated weight between two channels. Subjective listening test results show that the devised scheme’s quality is better than that of a passive downmix.
BibTeX
@inproceedings{icassp2025_stereodownmixin3,
title = {Stereo Downmix in 3GPP IVAS for EVS Compatibility},
author = {Takehiro Moriya and Stéphane Ragot and Arnaud Lefort and Alexandre Guérin and Noboru Harada and Ryosuke Sugiura and Yutaka Kamamoto},
booktitle = {ICASSP 2025},
year = {2025}
}