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 1 year ago by wipasoda@lemmy.world to showerthoughts@lemmy.world
Comments
jjagaimo@lemmy.ca 1 year ago
BlackRose@slrpnk.net 1 year ago
It’s light reflecting from the hand to the eye.
IONLYpost@kbin.social 1 year ago
read some book about NETWORKING/SIGNAL/INFORMATION to learn more.
mykl@lemmy.world 1 year 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 1 year ago
I’ll have what you and OP are having.
Lux@lemmy.blahaj.zone 1 year ago
Ok, but technically, it would actually be more like LIDAR, since we use visible light rather than radio waves
jonatan83@lemmy.fmhy.ml 1 year ago
Alas, RADAR relies on transmitting and then reading the reflected waves.
astrsk@kbin.social 1 year 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 1 year ago
unless you’re communicating by waving glowsticks, it’s passive radar