This AI can spoof your voice after just three seconds

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Artificial intelligence (AI) is having a moment right now, and the wind continues to blow in its sails with the news that Microsoft is working on an AI that can imitate anyone’s voice after being fed a short three-second sample.

The new tool, dubbed VALL-E, has been trained on roughly 60,000 hours of voice data in the English language, which Microsoft says is “hundreds of times larger than existing systems”. Using that knowledge, its creators claim it only needs a small smattering of vocal input to understand how to replicate a user’s voice.

man speaking into phone

More impressive, VALL-E can reproduce the emotions, vocal tones and acoustic environment found in each sample, something other voice AI programs have struggled with. That gives it a more realistic aura and bring its results closer to something that could pass as genuine human speech.

When compared to other text-to-speech (TTS) competitors, Microsoft says VALL-E “significantly outperforms the state-of-the-art zero-shot TTS system in terms of speech naturalness and speaker similarity.” In other words, VALL-E sounds much more like real humans than rival AIs that encounter audio inputs that they have not been trained on.

On GitHub, Microsoft has created a small library of samples created using VALL-E. The results are mostly very impressive, with many samples that reproduce the lilt and accent of the speakers’ voices. Some of the examples are less convincing, indicating VALL-E is probably not a finished product, but overall the output is convincing.

Huge potential — and risks

A person conducting a video call on a Microsoft Surface device running Windows 11.

In a paper introducing VALL-E, Microsoft explains that VALL-E “may carry potential risks in misuse of the model, such as spoofing voice identification or impersonating a specific speaker.” Such a capable tool for generating realistic-sounding speech raises the specter of ever-more convincing deepfakes, which could be used to mimic anything from a former romantic partner to a prominent international personality.

To mitigate that threat, Microsoft says “it is possible to build a detection model to discriminate whether an audio clip was synthesized by VALL-E.” The company says it will also use its own AI principles when developing its work. Those principles cover areas such as fairness, safety, privacy and accountability.

VALL-E is just the latest example of Microsoft’s experimentation with AI. Recently, the company has been working on integrating ChatGPT into Bing, using AI to recap your Teams meetings, and grafting advanced tools into apps like Outlook, Word and PowerPoint. And according to Semafor, Microsoft is looking to invest $10 billion into ChatGPT maker OpenAI, a company it has already plowed significant funds into.

Despite the apparent risks, tools like VALL-E could be especially useful in medicine, for instance to help people to regain their voice after an accident. Being able to replicate speech with such a small input set could be immensely promising in these situations, provided it is done right. But with all the money being spent on AI — both by Microsoft and others — it’s clear it’s not going away any time soon.

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