Because you use light to communicate in sign language, and light is just a electromagnetic wave like radio but on another frequency. You just need to be in line of sight
High frequency semaphore
Sign language is just radio communication but on another frequency
Submitted 11 months ago by wipasoda@lemmy.world to showerthoughts@lemmy.world
Comments
jjagaimo@lemmy.ca 11 months ago
BlackRose@slrpnk.net 11 months ago
It’s light reflecting from the hand to the eye.
IONLYpost@kbin.social 11 months ago
read some book about NETWORKING/SIGNAL/INFORMATION to learn more.
mykl@lemmy.world 11 months ago
Really, radio communication is about creating and transmitting those radio waves. Sign language relies on reflected light waves so it’s actually a form of RADAR 😀
undyingarchie@lemmy.world 11 months ago
I’ll have what you and OP are having.
Lux@lemmy.blahaj.zone 11 months ago
Ok, but technically, it would actually be more like LIDAR, since we use visible light rather than radio waves
jonatan83@lemmy.fmhy.ml 11 months ago
Alas, RADAR relies on transmitting and then reading the reflected waves.
astrsk@kbin.social 11 months ago
RADAR: RA(dio) D(etection) A(nd) R(anging)
It doesn’t rely on self transmission. It can but you can detect and range other sources without generating it yourself.
skillissuer@lemmy.world 11 months ago
unless you’re communicating by waving glowsticks, it’s passive radar