This new AI can mimic human voices with only 3



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Humanity has taken yet another step toward the inevitable war against the machines (which we will lose) with the creation of Vall-E, an AI developed by a team of researchers at Microsoft that can produce high quality human voice replications with only a few seconds of audio training.

Vall-E isn’t the first AI-powered voice tool—xVASynth (opens in new tab), for instance, has been kicking around for a couple years now—but it promises to exceed them all in terms of pure capability. In a paper available at Cornell University (opens in new tab) (via Windows Central (opens in new tab)), the Vall-E researchers say that most current text-to-speech systems are limited by their reliance on “high-quality clean data” in order to accurately synthesize high-quality speech.

“Large-scale data crawled from the Internet cannot meet the requirement, and always lead to performance degradation,” the paper states. “Because the training data is relatively small, current TTS systems still suffer from poor generalization. Speaker similarity and speech naturalness decline dramatically for unseen speakers in the zero-shot scenario.”

(“Zero-shot scenario (opens in new tab)” in this case essentially means the ability of the AI to recreate voices without being specifically trained on them.)

Vall-E, on the other hand, is trained with a much larger and more diverse data set: 60,000 hours of English-language speech drawn from more than 7,000 unique speakers, all of it transcribed by speech recognition software. The data being fed to the AI contains “more noisy speech and inaccurate transcriptions” than that used by other text-to-speech systems, but researchers believe the sheer scale of the input, and its diversity, make it much more flexible, adaptable, and—this is the big one—natural than its predecessors.

“Experiment results show that Vall-E significantly outperforms the state-of-the-art zero-shot TTS system in terms of speech naturalness and speaker similarity,” states the paper, which is filled with numbers, equations, diagrams, and other such complexities. “In addition, we find VALL-E could preserve the speaker’s emotion and acoustic environment of the acoustic prompt in synthesis.”

Vall-E diagram

(Image credit: Vall-E)

You can actually hear Vall-E in action on Github (opens in new tab), where the research team has shared a brief breakdown of how it all works, along with dozens of samples of inputs and outputs. The quality varies: Some of the voices are notably robotic, while others sound quite human. But as a sort of first-pass tech demo, it’s impressive. Imagine where this technology will be in a year, or two or five, as systems improve and the voice training dataset expands even further.

Which is of course why it’s a problem. Dall-E, the AI art generator, is facing pushback over privacy and ownership concerns (opens in new tab), and the ChatGPT bot is convincing enough that it was recently banned by the New York City Department of Education (opens in new tab). Vall-E has the potential to be even more worrying because of the possible use in scam marketing calls or to reinforce deepfake videos. That may sound a bit hand-wringy but as our executive editor Tyler Wilde said at the start of the year, this stuff isn’t going away (opens in new tab), and it’s vital that we recognize the issues and regulate the creation and use of AI systems before potential problems turn into real (and real big) ones.

The Vall-E research team addressed those “broader impacts” in the conclusion of its paper. “Since VALL-E could synthesize speech that maintains speaker identity, it may carry potential risks in misuse of the model, such as spoofing voice identification or impersonating a specific speaker,” the team wrote. “To mitigate such risks, it is possible to build a detection model to discriminate whether an audio clip was synthesized by VALL-E. We will also put Microsoft AI Principles (opens in new tab) into practice when further developing the models.”

In case you need further evidence that on-the-fly voice mimicry leads to bad places:

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