Aural Rehav Ch 10 Exam (2)

sound becomes electrical representation & is amplified; then the output reciever turns it back into sound

still an analog signal, but uses a digital control (to make adjustments)

signal into mic > A>D converter (sound signal turns digital) > send through processor (pick & choose signals, rem. feedack etc) > D>A conver

1. BTE (behind the ear), 2. RIC (reciever in canal), 3. ITE (in the ear), 4. ITC (in the canal), 5. CIC (completely in canal)

ear hook, microphone, volume, switch, battery compartment. Entire unit behind ear except ear mold

A BTE with recieer as part of earmold rather than part of BTE -sound intro. directly to canal (not via tubing)

entire aid is in ear, has a vent, shell is earmold contains all components

Same as ITE (in the ear) but smaller, doesn't fill top part of ear

no volume wheel, less power needed b/c less sound pressure needed, small "tab" to pull out or lyric stays for up to 4 mo.

a CIC style; worn 24/7 up to 4 mo.

*natural mic location *less sound pres. needed to achieve desired signal strength *reduced occlusion effect*less wind noise *no telecoil

oseointegrated bone vibration system; bone conduction sends signal to cochlea, screw with holes

amplifies sound vibrating ossicular chain -help ppl w/ external ear abnormal; esteem (sep incus ) piston driver attach to malleus &inc

1. Filtering Effect; 2. Disruptions of Loudness Growth; 3. Reduced Frequency Discrimination; 4. Reduced Temporal Resolution

1. Audible; 2. Discriminable; 3. Identifiable

1. Prevent sounds from being uncomfortably loud; 2. Reduce impact from competing signals

amount of amplification provided; controlled by volulme

can be controlled by channel; high f response=high f get more amp; low f response =low f get more amp; flat f response = equal amp for all f

max output the aid will allow; selected based on (UCL) uncomfortable loudness level and Safety, control is internal to instrument

signal cant exceed spec max calue (+)cheap,instant,consistant gain til sslp reached; (-) f distortion of signals exceeding SSLP

output adjuted depending on imput;(+)reduced f distort; may accomidate louudness recruitment;(-)$ distort of Intensity growth;

A-once signal exceeds a max level gain is adjusted down rapidly (1-2) R-once signal drops back to some min level gain can return to normal )

direct electrical stim of cochlear nerve cells Purpose=make sounds perceptible

External Speech processor(analyzes signal)Internal Magnet Internal Array(electrode array follows contour of coch.