Term
caused by sound leaking around or through the EM or shell,
going back to the microphone port, & then getting fed back through the aid; when the sound gets fed back through the aid, it is amplified with other sounds arriving at the HA microphone – which causes an audible squealing sound |
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Definition
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Term
High-Gain/Output Hearing Aids:
-It is typical for devices to feedback during ___/___
-Feedback typically happens when the gain is ___ and the input is ___
-Example: ambient noise is ___, WDRC device at its ___; called “open loop gain” (can be measured in some devices)
-More prone to feedback: 1) hearing aids with high output if the EM or shell is not ___ tightly (especially if vent is larger than 1 mm)
-Fix: REMAKE the EM or shell to ___ the fit |
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Definition
| insertion/removal; HIGH; low; low; peak; sealed; tighten |
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Term
Ear Canal Obstruction:
-Fix: remove ___ (if there are no contraindications to doing so)
-For RIC devices, the receiver may be lodged up against the ___ ___ |
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Definition
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Term
Tubing/Earhook/Mic/Rec:
-BTEs: sound travels from receiver through __ ___ and ___
-Check for ___/___ portion of the system |
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Definition
| ear hook & tubing; split/cracked |
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Term
Tubing/Earhook/Mic/Rec: Common Leakage Points:
-Microphone or receiver is ___ in the BTE case
-Ear hook is ___/___, or ___ connected to HA
-___ is cracked/split, or loose on the ear hook
-Vent is too ___
-Wax pushed ___ away from canal wall
-Wax directs sound into ___ or slit leak |
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Definition
| loos; cracked/split; loosely; Tubing; large; EM; vent |
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Term
Solutions for Feedback:
-Mechanical fixes: minimize the ___ size, change the ___, or remove ___ from the ear canal |
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Definition
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Term
Solutions for Feedback:
-Electronic fix: activate an “___-___ ___” (aka: automatic feedback reduction)
-Feature in software, requires patient to be ___
-___ companies have this feature
-Some companies have more/less “___ ___ gain”
-Allows __-__ dB more gain with an open fitting than in the past
-Will not fix all ___ |
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Definition
| anti-feedback algorithm; present; All; added stable; 10-15; feedback |
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Term
Loudness Tolerance Issues:
-Big problem: reported by __% of HA users (15% stop wearing HAs)
-Can ask listener to ___ loudness of sounds when aided
-Probe-microphone testing: Measuring ___ can help set HA’s AGC-o thresholds
-Electronic fix: Practitioner can change acoustic ____(s) via HA software
-Above may not fix problem in “___-___” |
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Definition
| 40; judge; LDLs; parameter; real-world |
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Term
Problem-Solving Steps for Loudness Intolerance:
-___ it is truly loudness discomfort
-If “loud, but ok” on Contour test, then ___
-If really loudness discomfort, there are 3 options
-1. Lower ___-__ knee-points
-2. Turn ___ ___ & present same signal
-3. Lower ___ to decrease output |
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Definition
| Verify; counsel; AGC-O; HA off; gain |
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Term
Lower AGC-0 Knee-points:
-___ method
-Use 2-dB steps & present a loud signal to listener until person rates _______________
-If use different noises; may be able to determine what ___ of the hearing aid’s MPO is best to adjust |
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Definition
| Preferred; #6 “loud, but ok”; channel |
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Term
Possible Next Steps if First Step Did Not Help (Loudness Intolerance):
-Turn aid ___, present same signal
-Ask pt to judge loudness; If still #7 “uncomfortably
loud”, then direct sound (not amplified sound) is uncomfortable (listener has low LDLs), so changing HA programming ___ ___ help
-If NOT low LDLs, can increase ___ ratios
-Note: Raising CR will also lower output for ___ speech (which may negatively impact fitting) |
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Definition
| off; will not; WDRC; average |
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Term
The Occlusion Effect:
-echo, ___ sound
-More annoying for those with ___ low-frequency hearing (no more than 30-40 dB HL LF hearing loss)
-Sound energy in throat travels to ear canal via ___, BC sounds make ___ vibrate, which makes AC sound in canal
-Normally LF sound escapes via ___ canal
-LF sound will not escape if canal is ___ |
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Definition
| hollow; better; BC; EAC; open; occluded |
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Term
Solutions for the Occlusion Effect:
-Fit EM or aid ___ into the EAC to seal ___ the 2nd bend (this minimizes vibrations of the cartilage in the EAC)
-Side effects of deep fitting: __________________________.
-Most popular solution: increase ___
-Once vent size reaches ___mm or more, most OE is minimized
-___ fittings |
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Definition
| deeply; beyond; pain, discomfort, aid may be difficult to insert; venting; 3mm; Open |
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Term
Quick Test for OE:
-Ask pt to read something with the aid ___
-Then ask pt to read something with the aid ___
-If the hollow sound goes away with the aid turned off, it is ___ the occlusion effect |
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Definition
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Term
Cell Phones & Hearing Aids:
-Phones emit radio waves called ___-___ (RF emissions)
-RF emissions create an ____ field around the phone’s antenna
-EM field has a ___ pattern
-HA mic or telecoil picks up EM field, which listener hears as “___” sound |
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Definition
| radio-frequency; electromagnetic (EM); pulsing; buzzing |
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Term
| Amount of interference a HA user experiences depends on the degree of ___ ___ that a specific cell phone produces & how ___ the phone is to the RF emissions |
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Definition
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Term
| What is the best M and T ratings for a phone? |
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Definition
| M4 and T4. They are likely to work best and have less interference |
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Term
| The Strength of RF Emissions that Leak from Phones ___ by Phone |
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Definition
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