A Sound Beam That Only You Can Hear: New Tech Enables Private Music Listening

Acoustic Metasurface Development

According to НВ — Техно: Researchers have engineered an acoustic metasurface capable of creating isolated sound zones for private listening. The device produces a narrow audio beam that rapidly dissipates beyond a targeted area, delivering high-quality sound without disturbing those nearby. Measuring roughly 15 centimeters in diameter, the metasurface directs sound waves into a zone just over 2.5 centimeters wide.

Testing and Results

During experiments, the team played electronic music with heavy bass. Measurements showed that sound volume dropped by nearly 50 decibels just 5 centimeters away from the focal zone. The system can reproduce frequencies as low as 38 hertz, highlighting its technological effectiveness.

According to Ji Woo Kevin Kim, 'current directional systems only work well under controlled conditions.'

He also noted that 'when the sound beam hits a surface, the sound can spread throughout the room, reducing privacy and bass playback quality.'

The metasurface was produced using 3D printing, opening up new possibilities for its application. The technology could be used in areas such as:

• ATMs
• information kiosks
• cars
• other devices

Yun Jing stated that 'the surface alters the waves so they converge at a single point after leaving the speaker.'

This breakthrough in acoustic metasurface design marks a significant step forward in sound technology, potentially transforming how we experience audio in everyday settings. Business owners and electronics manufacturers could leverage this innovation to enhance user experiences while maintaining listening privacy. Integrating such systems across various applications may drive new standards in acoustics and audio device design.