rehab notes essays

rehab notes essays Amplification systems for hearing impaired: - hardwired system: not used much today, child wears earphones and plugs into a system on the desk therefore allowing no mobility, teacher wears handheld microphone, sound child hears is different from hearing aids - induction loop amplification system: for group amplification; still used; parts contain a loop that runs around the room either along the walls or under the carpet, also includes one or more microphones, an amplification unit, and children have to wear hearing aids with telephone coils; what teacher says is picked up by microphone, amplified, then sent through the loop as current flow. The electromagnetic field that is created induces a current in each childs hearing aid (which is turned to telephone or induction coil). Disadvantage: spillover or cross-talk between rooms can occur in schools where more than one ILA system is used in close proximity, constancy of amplification level, often fluctuated, were dead spots within the loop. Advantages: mobility was possible within the class, there was to a great extent constancy of input, consistency of auditory input at home and in the classroom. - Radio frequency system: relies on radio frequency bans for the transmission and reception of speech signals. There is a wireless microphone transmitter than sends a signal to a tuner and amplifier unit which then sends a signal to a broadcast antenna. The students are equip with radio receiver units powered by rechargeable batteries for feedback and monitoring purposes, students can use the teachers microphone, overhead microphone, or setting on their individual units which allow for a mixing of the radio frequency and hearing aid microphone signals. Children are limited to an area surrounded by a broadcast loop antenna. - FM (freq. mod) wireless system: allows complete mobility and does not involve a stationary amp unit or Teacher wears a microphone FM transmitte...