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Noise-canceling headphones use AI to let a single voice through

May 25, 2024
in Technology
Noise-canceling headphones use AI to let a single voice through
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Although the technology is currently a proof of concept, its creators say they are in talks to embed it in popular brands of noise-canceling earbuds and are also working to make it available for hearing aids.

“Listening to specific people is such a fundamental aspect of how we communicate and how we interact in the world with other humans,” says Shyam Gollakota, a professor at the University of Washington, who worked on the project. “But it can get really challenging, even if you don’t have any hearing loss issues, to focus on specific people when it comes to noisy situations.” 

The same researchers previously managed to train a neural network to recognize and filter out certain sounds, such as babies crying, birds tweeting, or alarms ringing. But separating out human voices is a tougher challenge, requiring much more complex neural networks.

That complexity is a problem when AI models need to work in real time in a pair of headphones with limited computing power and battery life. To meet such constraints, the neural networks needed to be small and energy efficient. So the team used an AI compression technique called knowledge distillation. This meant taking a huge AI model that had been trained on millions of voices (the “teacher”) and having it train a much smaller model (the “student”) to imitate its behavior and performance to the same standard.   

The student was then taught to extract the vocal patterns of specific voices from the surrounding noise captured by microphones attached to a pair of commercially available noise-canceling headphones.

To activate the Target Speech Hearing system, the wearer holds down a button on the headphones for several seconds while facing the person to be focused on. During this “enrollment” process, the system captures an audio sample from both headphones and uses this recording to extract the speaker’s vocal characteristics, even when there are other speakers and noises in the vicinity.

These characteristics are fed into a second neural network running on a microcontroller computer connected to the headphones via USB cable. This network runs continuously, keeping the chosen voice separate from those of other people and playing it back to the listener. Once the system has locked onto a speaker, it keeps prioritizing that person’s voice, even if the wearer turns away. The more training data the system gains by focusing on a speaker’s voice, the better its ability to isolate it becomes. 

For now, the system is only able to successfully enroll a targeted speaker whose voice is the only loud one present, but the team aims to make it work even when the loudest voice in a particular direction is not the target speaker.

Singling out a single voice in a loud environment is very tough, says Sefik Emre Eskimez, a senior researcher at Microsoft who works on speech and AI, but who did not work on the research. “I know that companies want to do this,” he says. “If they can achieve it, it opens up lots of applications, particularly in a meeting scenario.”

While speech separation research tends to be more theoretical than practical, this work has clear real-world applications, says Samuele Cornell, a researcher at Carnegie Mellon University’s Language Technologies Institute, who did not work on the research. “I think it’s a step in the right direction,” Cornell says. “It’s a breath of fresh air.”

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Copyright for syndicated content belongs to the linked Source : Technology Review – https://www.technologyreview.com/2024/05/23/1092832/noise-canceling-headphones-use-ai-to-let-a-single-voice-through/

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