Post B6bQcxWNzJj8T7r852 by drahardja@sfba.social
 (DIR) More posts by drahardja@sfba.social
 (DIR) Post #B6bQcxWNzJj8T7r852 by drahardja@sfba.social
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       RE: https://mastodon.nz/@SimonCHulse/116623169267315966This is pretty cool!tl;dr: They added a 750 Hz-resonant component to the bicycle bell.They discovered that most ANC headphones have a dead spot at 750 Hz where the low frequency ANC and high frequency ANC (and I assume passive cancellation) cross over, so they targeted that gap by adding another bell casing to the bicycle bell with that resonant frequency.PS: Having said that, I can’t help but think that using ANC while walking or biking in traffic is a REALLY BAD IDEA in the first place.RT: https://mastodon.nz/users/SimonCHulse/statuses/116623169267315966
       
 (DIR) Post #B6bQcz5s8rhtLTSz20 by drahardja@sfba.social
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       You can hear the bell multiple times in this video: https://www.youtube.com/watch?v=xLJs_E7ml_4You hear two tones: The traditional bicycle bell sound, plus another, lower frequency version of it.