In this paper we describe the voice mode of the Opus speech and audio codec. As only the decoder is standardized, the details in this paper will help anyone who wants to modify the encoder or gain a better understanding of the codec. We go through the main components that constitute the voice part of the codec, provide an overview, give insights, and discuss the design decisions made during the development. Tests have shown that Opus quality is comparable to or better than several state-of-the-art voice codecs, while covering a much broader application area than competing codecs.

Authors: Vos, Koen; Sørensen, Karsten Vandborg; Jensen, Søren Skak; Valin, Jean-Marc
Affiliations: vocTone, San Francisco, CA, USA; Microsoft, Stockholm, Sweden; GN Netcom A/S, Ballerup, Denmark; Mozilla Corporation, Mountain View, CA, USA(See document for exact affiliation information.)
AES Convention: 135 (October 2013) Paper Number: 8941
Publication Date: October 16, 2013
Subject: Signal Processing

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