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Do you think they are using some kind of inaudible-to-humans signal to coordinate this or is the unmodified audio good enough?
by iandanforth 2y ago
Do you think they are using some kind of inaudible-to-humans signal to coordinate this or is the unmodified audio good enough?
- vineyardmike 2y agoUnmodified audio is good enough, but using some signaling sound would improve coordination.
- dathery 2y agoI could see this happening. Zoom for example already uses ultrasonic sound to detect what conference room a laptop is in for one-click screen sharing.
- YZF 2y agoI wasn't aware audio hardware on laptops can emit ultrasound. Aren't those filtered to be below 22KHz?
- nomel 2y agoMost adults can’t hear > 18kHz. Related, there are devices you can buy to repel teenagers: https://www.today.com/news/controversial-mosquito-sonic-devices-deter-young-people-high-pitched-sounds-t157801 https://www.today.com/news/controversial-mosquito-sonic-devi...
- stavros 2y agoI can hear whatever my PC can output, but I can't hear anything in our Zoom meeting rooms. Maybe it's low volume, though.
- nomel 2y ago> I can hear whatever my PC can output This would require measuring equipment, since you can also only hear what you PC can output that you can hear. ;)
- hiimshort 2y agoAs someone who grew up with iPhones coming out around the time I was in middle school and apps producing noises like this were used as pranks in class I have to ask that people don't do this. The sound is painful.
- IshKebab 2y agoYeah I'm pretty sure there are plenty of adults that can hear those frequencies though. It's not like everyone reaches 18 and suddenly loses hearing. Stupid devices IMO. When they first came out I downloaded a sample audio file from the manufacturers website to see if I could hear it. I couldn't.... because they encoded it as MP3 and it was completely filtered out by the encoding! Literally an empty file.
- ercan 2y agoI used to hear the remote from TVs especially old Philips ones and LG's with the single chip on them. That was until I hit 44... after that is hit or miss or just imagining.
- thfuran 2y agoBut weren't old remotes all IR?
- cbracken 2y agoSome very old remotes used what effectively amounted to high frequency tuning forks. Example: https://www.theverge.com/23810061/zenith-space-command-remote-control-button-of-the-month https://www.theverge.com/23810061/zenith-space-command-remot...
- ssl-3 2y agoNo, not all were IR. But all of them made by "LG" and featuring a single-chip design are either IR or RF.
- alexdbird 2y agoThose will still have a ceramic resonator in them, as they’re cheaper than a quartz crystal. Hard to imagine them being audible, but not impossible.
- Fanmade 2y agoIn our region, some people have devices to repel moles or marten using "Sounds that are inaudible for humans". I have yet to come near to one of these devices that I can't hear. And it's not only me, my wife can also hear them, as well as my daughter. I also know some people who can't hear anything from these devices, but it feels like the statistics about what people can hear and what not are not that up to date.
- rangestransform 2y agoThese are everywhere in Japan as anti loitering devices
- literallycancer 2y agoCourtesy of anti social boomers. If I ever meet the person who approved the installation of this kind of system I swear I'll punch them in the face.
- andrekandre 2y agoi wonder if that is what those super irritating high-pitched screeching noises near some buildings in shibuya... it seems to occur only late at night but could be wrong... i had assumed they were for driving rodents away but i guess not?
- jorvi 2y agoChromecasts do it too, for pairing purposes. I’m sure other devices use it for clever purposes as well.
- whoknowswho 2y agoTeams does it too, I've had meetings where I've been able to audibly hear it coming from devices
- slac 2y agoNot great if you have dogs in the office unfortunately.