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Room-scale Hand Gesture Recognition Using Smart Speakers.

Dong Li¹, Jialin Liu¹, Sunghoon Ivan Lee¹

¹University of Massachusetts Amherst.

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|January 5, 2026

Summary

This summary is machine-generated.

Researchers extended acoustic sensing range for contact-free hand gesture recognition to room-scale using smart speakers. This breakthrough enables accurate gesture recognition from up to 5 meters away, even with interference.

Keywords:

Contact-free acoustic sensing Room-scale hand gesture recognition Smart speaker

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Area of Science:

Human-Computer Interaction
Acoustic Sensing Technology
Signal Processing

Background:

Acoustic sensing offers fine-grained, contact-free hand gesture recognition.
Current limitations include a very short sensing range (approx. 1 meter).
This restricts applications to close-proximity device interaction.

Purpose of the Study:

To significantly enhance the sensing range of acoustic gesture recognition.
To enable room-scale hand gesture recognition using commodity smart speakers.
To demonstrate the feasibility of long-range acoustic sensing for gesture recognition.

Main Methods:

Developed novel signal processing techniques for acoustic sensing.
Implemented the system on commodity smart speaker prototypes with varying microphone configurations.
Conducted extensive evaluations across diverse environments.

Main Results:

Successfully increased the acoustic sensing range from 1 meter to 4-5 meters.
Achieved over 90% gesture recognition accuracy at a distance of 4 meters, even with strong interference.
Validated the system's performance with 1440 gestures from 16 participants.

Conclusions:

Commodity smart speakers can be leveraged for room-scale hand gesture recognition.
The developed techniques overcome range limitations of prior acoustic sensing methods.
This research paves the way for new applications in smart homes and interactive environments.