We present the Voice Conversion Challenge 2018, designed as a follow up to the 2016 edition with the aim of providing a common framework for evaluating and comparing different state-of-the-art voice conversion (VC) systems. The objective of the challenge was to perform speaker conversion (i.e.\ transform the vocal identity) of a source speaker to a target speaker while maintaining linguistic information. As an update to the previous challenge, we considered both parallel and non-parallel data to form the Hub and Spoke tasks, respectively. A total of 23 teams from around the world submitted their systems, 11 of them additionally participated in the optional Spoke task. A large-scale crowdsourced perceptual evaluation was then carried out to rate the submitted converted speech in terms of naturalness and similarity to the target speaker identity. In this paper, we present a brief summary of the state-of-the-art techniques for VC, followed by a detailed explanation of the challenge tasks and the results that were obtained.


ObEN is an artificial intelligence company that creates complete virtual identities for consumers and celebrities in the emerging digital world. ObEN provides Personal AI that simulates a person’s voice, face and personality, enabling never before possible social and virtual interactions. Founded in 2014, ObEN is a Softbank Ventures Korea and HTC Vive X portfolio company and is located at Idealab in Pasadena, California.