Yes, Infrared is definitely a line of sight communications device, as infrared wavelengths cannot bend around any type of objects, the devices have to be within visual contact to communicate.
TV transmission from one antenna to other antenna is a clear example of line of sight communication.
aural means sound. ( Non verbal communication sounds would be sighs, grunts and things like grinding of teeth). visual means sight. ( Smiles, facial expressions, body posture and gesticulations).
People with sensory loss such as hearing or sight can benefit from different types of effective communication. For example, those with hearing loss may benefit from using sign language or pictures to communicate. Those with sight loss may benefit most from vocal communication.
Your presumption is false. Eyesight is a boon to communication, not a barrier. Attention to eyesight might distract you from another sense, but the choice is there.
Writing; speaking or verbal; sign language; facial expressions; semaphore or naval flags; Morse code either aural (sound) or visual (sight) etc. ADLS: Tap Code
infrared is limited to (line of sight) communications.
Infrared (IrDA) requires direct line of sight and very short distances. It's primary use is cordless input devices.
Infrared communication is impaired by loss of a direct line of sight. This is caused by physical obstructions between the emitter and receiver.
An infrared transceiver, also called an IrDA (Infrared Data Association) transceiver or an IR transceiver, provides an infrared port for wireless communication. Microwave links offer high speed data transfer and also require line of sight between the transponders. Additionally, satellite receivers demand a clear path to the satellite itself although cloud cover and other atmospheric conditions mean that a line of visible sight is not required.
Infrared networks that bounce the signal off ceilings and walls use reflective infrared technology. This allows the infrared signal to be redirected and reach its intended destination even if the line of sight is obstructed.
15-20 feet, remember it has to be line of sight.
Infrared light
There are a lot of things that infrared lights are used for, primarily sight enhacements. Just to name a few, infrared lights are used for night vision, thermography, hyperspectral imagery, tracking, and heating.
You can connect a PC to a Laptop via infrared by ensuring that their respective dongles have a clear line of sight between each other. You also need to have the appropriate infrared client software installed on both computers.
An infrared keyboard is a keyboard that transmits data to the computer via an infrared receiver. In practice, these have been exceedingly rare, since the advantage of being cordless is lost if you must retain line of sight. The most [in]famous example of an infrared keyboard would probably be that of the IBM PC Jr.
Visible light and infrared light are the parts of the electromagnetic spectrum that can be seen with the eye.
Optical fibers are a line of sight communication medium that transmit data using light signals that travel straight along the fiber. They are commonly used in telecommunications and internet services for high-speed data transmission.