Zvook

Zvook ("sound" in Ukrainian) is a Lviv-based startup, founded in 2023, that builds a passive acoustic detection network for air defence. Each sensor pairs an acoustic mirror -- a parabolic antenna that focuses faint sound onto a microphone -- with a small on-board computer running machine-learning software, listening for the distinctive signatures of aerial threats such as Shahed-type drones, cruise missiles, helicopters, and jets. Because the sensors are passive and decentralised, they emit nothing and can be sited where radar would be too exposed; by comparing the same sound across several units the network estimates a target's type, bearing, and speed. Around 40 of Zvook's sensor complexes operate across Ukraine, concentrated near the eastern border, feeding detections into the Delta situational-awareness system within seconds. In January 2026 Zvook launched the NW0, an Ethernet-connected tactical acoustic sensor for short-range FPV-drone detection with 360-degree coverage between 150-450 meters and IP67 weatherproofing, able to detect fiber-optic FPV drones that evade radio-based jamming and detection.