Post #1203866
2026-04-09 06:33 UTC
@Slash909uk
> I wonder if these ANC headphone makers are obliged to support 'emergency' vehicle tone detection and not blank it out?
I would assume so, because of the potential legal liability.
Yet 750Hz meets this only partially, as it's the lower range of the lower band of the UK's and few other European countries two-tone pattern¹.
So that would assume there are more frequencies to take into account and wanted to check in with RTINGS tests, but they »
@dec23k
Replies (2)
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@dzwiedziu@mastodon.social 2026-04-09 06:33
« paywalled their test results :( 1. https://sirengenerator.com/sirens/two-tone @dec23k @Slash909uk
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@dec23k@mastodon.ie 2026-04-09 10:34
@dzwiedziu @Slash909uk Regular DTMF tones are close - the numbers 4 5 6 include 770hz. May or may not be close enough. I don't have any ANC headphones so I can't test that myself.