Skoda has introduced the DuoBell, a fully mechanical bike bell designed to outperform active noise cancellation (ANC) headphones.
The automaker, along with acoustic researchers at the University of Salford, has reinvented the bike bell to address a real and growing urban problem: pedestrians are so wrapped up in their ANC bubble that a traditional ringtone can’t reach them.
Why is a normal bicycle bell no longer enough?
Over the year, ANC has improved dramatically, allowing ANC-enabled earbuds or headphones to almost completely cancel out ambient noise.
In London alone, up to half of all pedestrians now walk around with noise-cancelling headphones, and many of these devices, particularly the flagship devices, are so good that a standard bike bell can’t match them.
As the number of cyclists soars in cities around the world and ANC becomes more accessible, it’s a recipe for collisions. In 2024, incidents between cyclists and inattentive pedestrians in London increased by no less than 24%.
How does the DuoBell actually outsmart ANC technology?
This is where things get clever. Through acoustic tests, the researchers identified a narrow “safety gap” in the frequency spectrum, namely between 750 and 780 Hz, which ANC filters have difficulty suppressing. Guess what? The DuoBell is tailored precisely to this area.
It also features a second resonator tuned to a higher frequency and a specially designed hammer mechanism that delivers fast, irregular hits, creating sound patterns that ANC algorithms simply can’t suppress fast enough.
The results speak for themselves. Tests have shown that pedestrians wearing ANC headphones have up to 22 meters of additional reaction distance when cyclists use DuoBell. Wiggle room in traffic could mean the difference between a near miss and something much worse. For me, it’s analogue ingenuity defeating digital arrogance.
