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Verification Protocol for Signal Transparency Using the Cochlear Mini-Microphone 2+ and Digital Modulation
Rhonda Sousa1, Erika Nair1, Shannon Wannagot2
1Soundbridge, Wethersfield, CT.
Journal of the American Academy of Audiology
|November 22, 2018
Summary
Adapted American Academy of Audiology (AAA) guidelines enable electroacoustic verification for cochlear implant (CI) sound processors with mini microphones and digital-modulated (DM) systems. This ensures optimal fitting and audibility for CI users.
Area of Science:
- Audiology
- Biomedical Engineering
- Hearing Science
Background:
- Current American Academy of Audiology (AAA) guidelines recommend behavioral testing for fitting frequency-modulated (FM) systems with cochlear implants (CIs).
- No established protocol exists for electroacoustic measures on CI sound processors with FM/digital-modulated (DM) systems or mini microphones.
- Professionals adapt existing AAA (2008) hearing aid protocols for FM systems to fit these devices to CI sound processors.
Purpose of the Study:
- To evaluate the feasibility and verifiability of adapted AAA (2008) electroacoustic verification guidelines.
- To assess these guidelines for fitting mini microphones and mini microphones coupled to DM systems to CI sound processors.
Main Methods:
- Electroacoustic measures were performed on 51 Cochlear Nucleus 6/CP910 sound processors.
- Adapted AAA (2008) protocol used with Cochlear Wireless Mini Microphone 2+ (MM2+) and Phonak DM System (Roger Inspiro/Roger X receiver).
- Transparency (equal output with and without remote microphone technology) was the primary verification measure, with adjustments to receiver gain as needed.
Main Results:
- Using adapted AAA (2008) guidelines, 50 of 51 CI sound processors achieved transparency when streaming to the MM2+ alone.
- With the MM2+ coupled to the Phonak DM system, 28 processors met transparency at default gain; all 51 achieved transparency after receiver gain adjustment.
- The adapted AAA (2008) protocol proved feasible for electroacoustic verification.
Conclusions:
- Adapted AAA (2008) guidelines are feasible for electroacoustic verification of CI sound processors.
- Transparency can be achieved for CI sound processors coupled to mini microphones or mini microphones with DM systems.
- This study validates an adapted protocol for fitting remote microphone technologies to CIs.
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