Post #997533
2026-04-08 00:36 UTC
Replies (14)
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@moz@fosstodon.org 2026-04-08 01:09
@dec23k that is very cool. But I can't buy one!! Hopefully people start manufacturing them because the noise cancelling problem exists in Sydney, Australia as well. #SkodaDuoBell #DuoBell #BikeTooter
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@RudiRastlos@troet.cafe 2026-04-08 06:52
@dec23k uuhhhh, the new world 😱🫣
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@maxheadroom@hub.uckermark.social 2026-04-08 07:30
@dec23k @jwildeboer This looks very much like our old GDR bike bells. The exact same mechanics inside 😂
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@HollieK72@mastodonapp.uk 2026-04-08 07:49
@dec23k If people are riding bikes in places where pedestrians are walking, then they should be prepared to dismount and wheel the bike along if they haven't got a clear path ahead, instead of expecting people to jump out of their way because they've rung a bell. It is not fun to find a cyclist zooming up behind you at a rate of knots, and it's difficult to gauge where you should move to in the short space of time you have between them ringing the bell and catching up with you.
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@nicd@masto.ahlcode.fi 2026-04-08 07:52
@dec23k I can appreciate the engineering, it feels like sometimes my bell is inaudible to everyone but me. On the other hand regarding the safety aspect, I've started to change my habits so that when pedestrians are around, I try to slow down enough such that my bell wouldn't be necessary to avoid an incident at all. I think the best safety action would be building more separated lanes. Perhaps I just don't live in a city that's big enough?
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@Slash909uk@mastodon.me.uk 2026-04-08 10:41
@dec23k interesting. From the paper I understand the 750Hz tone is around 3dB less attenuated, but only in quiet areas with already not much noise, like parks. In noisy areas, any tone that is distinct from the noise is more easily heard. But everything is attenuated and the warning distance is considerably lower already. I wonder if these ANC headphone makers are obliged to support 'emergency' vehicle tone detection and not blank it out? Does anyone know? Or there is the air horn solution🤪
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@petererer@fuzzle.me.uk 2026-04-08 10:48
@dec23k@mastodon.ie Sounds good, but who's actually selling it?
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@geert@society.oftrolls.com 2026-04-08 12:16
@dec23k Yeah, let's fix all sound sources, instead of the single receiver! What about the other important sounds a pedestrian is supposed to hear? https://society.oftrolls.com/@geert/116368228635841792
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@snaggen@mastodonsweden.se 2026-04-08 13:08
@dec23k I'm sure it is a great bell, and being able to be heard even with noise cancelling headphones is great. But I'm still not sure I get the video. The video says that the bike accidents have increased with 24% due to noise cancelling headphones, and implies that this bell would fix that. That means that the hypothesis they had was that a person on a bike saw the pedestrian, rang its bell, got no reaction and then just ran over the pedestrian?!
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@MattisCB@nrw.social 2026-04-08 13:11
@dec23k ANC does not and cannot cancel single audio events... That's not how this works. That's not how any of this works... 🙂↔️ANC let's you hear a bicycle bell even better because it cancels the constant traffic noise that would drown voices, horns and bells.
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@clickhere@mastodon.ie 2026-04-08 15:42
@dec23k So, in the use-case scenario here, I'm on my bike, and I see that there's a person walking/wheeling ahead of me and they're wearing noise cancelling headphones. Question: Why do I need a bell? Assumptions: (a) If they're ahead of me and in my path, I'm either on a footpath, shared path, or carriageway; (b) I have seen them. Answers: (b) I have seen them; (a) If I'm on a footpath, I need to move; if I'm on a shared path, I need to wait; if I'm on a carriageway, I need to wait.
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@dzwiedziu@mastodon.social 2026-04-09 06:36
@dec23k 750Hz seems weird, as there is no one emergency signal frequency, yet better than my idea of blasting directional infrasounds, to make pedestrians viscerally afraid of crossing cyclists' paths ^_^
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@lenaschimmel@chaos.social 2026-04-09 07:36
@dec23k That 750 Hz bell that uses the 750 Hz gap in noise cancellation headphones seems to be all nice and good, until you look at the actual frequencies that the bell emits: - 1980 Hz (missing sometimes?) - 5040 Hz - 9000 Hz - 13300 Hz The image below was created using Specdroid while playing the video.
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@glent@aus.social 2026-04-09 16:55
@dec23k This is rubbish. 750Hz is around F5#, the F# in the octave above middle C. So the claim is that if you put on your ANC headphones and run your fingers up the white and black keys, then a few notes will be particularly louder. If you have a piano or a keyboard, give it a go now. See for yourself. One of the cases where a cheaper instrument is better. If this really existed, audiophiles would be besieging the HQs of Sony, Bose and Apple over poor headphone performance whenever near the huge amount of popular music in F# minor. --- So of course I had to read the paper. Turns out the claim isn't that 750Hz is louder. The claim is that 700-800Hz is psychometrically more noticed. So this need not be a feature of ANC at all. It could be a feature of humans. And why are these frequencies more noticed as bicycle bells by human listeners. That would be because these frequencies are often used by bicycle bells. People pay more attention to the things they are listening for. Shocked I am.