True or False?
You can leave the room and still hear the presentation.
This system can be used indoors or outdoors.
You must have a receiver to use this system.
You must have a hearing aid to use this system.
You can use infrared in multiple rooms in a building.
I can use my IR receiver with your IR transmitter.
Notes:
Thinking about light transmission and remote controls, how many of these can you figure out?
False. Just like the remote on the VCR, the transmitter and receiver must be in direct line of sight of each other to receive the signal. You cannot change channels from a different room with a remote. In fact, if someone walks between you (and the remote) and the TV, the remote will not work. Light does not travel through solid surfaces.
False. Because infrared uses light, other intense light sources, such as the sun, can interfere with the signal. Infrared can be used indoors away from very bright areas, and outdoors ONLY in the evening or under cover.
True. Also, with infrared systems, the receiver is often built into a coupling device such as headphones, so that they are one piece.
False. Again, if you have the appropriate coupling device for use with the receiver, you do not have to have a hearing aid. The ability to switch couplers will depend upon the manufacturer.
True. Because light will not travel through walls, infrared systems can be used in adjoining rooms with no spill over or interference.
Usually true. For the most part, infrared receivers and transmitters are interchangeable, with an industry standard of 95 KHz. Another type is being produced now due to interference from high intensity lighting transmitting at 250 KHz. The components from the two systems cannot be mixed.