Skoda develops bike bell that can bypass noise-cancelling headphones, and then gives the technology away for free

Škoda, in collaboration with the University of Salford, has developed an innovative bike bell called the DuoBell, designed to overcome a modern safety challenge posed by noise-cancelling headphones. Traditional bike bells and audible warnings are often rendered ineffective by these headphones, which cancel out ambient sounds, increasing the risk of accidents involving pedestrians. DuoBell emits a unique dual-frequency sound that penetrates the foam padding of over-ear headphones, ensuring cyclists can alert pedestrians effectively even when they are wearing noise-cancelling devices. The technology behind DuoBell leverages a short, sharp tone at 750 hertz, which is too brief for noise-cancelling algorithms to process and cancel out, combined with a secondary tone at 2000 hertz that people instinctively recognise as a bike bell. Testing revealed that this new bell is audible from significantly further away—about 15 metres more—than conventional bells when pedestrians wear noise-cancelling headphones. This improvement addresses a concerning rise in pedestrian accidents, which Škoda notes have increased by 30% in recent years, partly due to the widespread use of such headphones. Notably, Škoda has chosen not to commercialise or restrict access to this technology. Instead, the company has released the underlying science and specifications as an open-source whitepaper, allowing manufacturers and developers worldwide to adopt and implement the design freely. This move reflects Škoda’s commitment to road safety and urban wellbeing, prioritising public benefit over profit. It also represents a rare example of a car manufacturer contributing positively to cycling safety, despite the often competitive relationship between motorists and cyclists. The introduction of DuoBell could have wider implications for urban mobility and shared spaces, where the interaction between pedestrians and cyclists is frequent and sometimes fraught. As noise-cancelling headphones become more prevalent, innovations like this may become essential for maintaining safety and communication on shared paths and roads. While it may take some time before DuoBell technology becomes commonplace in commercial bike bells, Škoda’s open approach sets a promising precedent for collaborative innovation in transport safety.