How the remote control in consumer electronics goods work?
July 5, 2010 - 8:33 pm
In TV,Is Infra red type or RF is used and why the choice?
Most remotes use infra-red.
The reason is that they work pretty well, have good durability and battery life, and are quite cheap. They use a microcomputer with some dedicated circuitry to generate pulses. The TV has a detector that is similar.
Also, RF devices typically require FCC approval, a tedious and expensive task.
July 6th, 2010 at 2:10 am
Most remotes use infra-red.
The reason is that they work pretty well, have good durability and battery life, and are quite cheap. They use a microcomputer with some dedicated circuitry to generate pulses. The TV has a detector that is similar.
Also, RF devices typically require FCC approval, a tedious and expensive task.
References :
July 6th, 2010 at 2:25 am
They are both sent like morse code, on-off for certain durations.
check out page 4 and on of my source for more. (infrared specific but general concept for both)
RF uses radio wave frequencies instead of light frequencies
For more on RF, check out PCM and PWM on wikipedia
References :
http://www.parallax.com/Portals/0/Downloads/docs/prod/sic/WebIR-%20v1.1.pdf
http://en.wikipedia.org/wiki/Pulse-code_modulation
http://en.wikipedia.org/wiki/Pulse_width_modulation