Communications systems for the disabled

Communicating with a disabled person is not simple as communicating with an ordinary person,communicating with them needs,special technique and gadgets.common communications systems are such as sign language which commonly used by a deaf or mute person,braille system by a blind,even high tech gadgets are used for communications of a disabled such as hearing aid for deaf but is not an alternative because a hearing aid is expensive and need high maintenance .

SIGN LANGUAGE

A sign language is a language which,instead of acoustically conveyed sound patterns,uses visually transmitted patterns and lip patterns to convey meaning simultaneously,orientation and movement of the hands,arms or body,and facial expressions to fluidly express a speaker's thoughts.Sign language commonly develop in a deaf communities,which can include interpreters and friends and families of a dead people as well as people who are deaf or hard of hearing themselves.

BRAILLE SYSTEM

The braille system is a method that is used by blind people to read and write.Braille was devised in 1821 by Louis Braille,a Frenchman who is blind.Each braille is made up of six dot positions,arranged in a rectangle containing two columns of three dots each.A dot may be raised at any of the six positions to form sixty-four permutations including the arrangement in which no dots are raised. For reference purpose,a particular permutations may be described by naming the positions where dots are raised the positions being universally numbered 1 to 3,from top to the bottom,on the right.The lines of horizontally Braille text are separated by a space,much like visible printed text,so that the dots of one line can be differentiated from the Braille text above and bellow.




HEARING AIDS

A hearing aid is electroacoustic body worn apparatus which typically fits in or behind the wearer;s ear,and is designed to amplify and modulate sound for the wearer.Earlier devices,known as an "ear trumpet" were passive funnel-like amplification cones designed to gather sound energy and direct it into the ear canal.Similar devices include the bone anchored hearing aid and cochlear implant.