Automatically Align the Frequency Response, Loudness Growth, and AGC of your Patient’s CI and Hearing Aid in the Fewest Step
☑ Select “Adaptive Phonak Digital Bimodal” fitting formula
Conventional bimodal fitting procedures required for fitting other cochlear implants to work with a hearing aid can be time-consuming. You need expertise with both hearing aid and cochlear implant fitting software, and may spend considerable time fitting both devices. The simple selection of the Phonak Adaptive Bimodal Fitting Formula in the Phonak fitting software bypasses the iterative fine tuning required to balance the bimodal listening experience for your patients.
Programming a Naída™ Link with Phonak Target programming software is easy. To take advantage of the optimized frequency response, loudness growth, and dynamic behavior, the fitter only needs to connect a Naida Link to Target. By default APDB is selected and will offer these benefits to bimodal listeners.
Why is a Bimodal Fitting Formula necessary?
Conventional hearing aid prescriptions (e.g., NAL-NL2, DSL v5) do not align acoustic and electric processing, which is required for optimal bimodal hearing. This relates to the frequency response, loudness growth and dynamic behavior of the two devices.
Frequency Response: Traditional fitting prescriptions, for example, focus amplification in frequency regions that are important for speech understanding (1 – 4 kHz), whereas low frequencies (250 – 750 Hz) may be most important for maximizing bimodal benefit.
Loudness Growth: Low compression kneepoints (CK < 50 dB SPL) and moderate compression ratios (CR ~ 2:1) are usually prescribed for hearing aids, while cochlear implants use very different input/output functions (e.g., Naída CI: CK = 63 dB, CR = 12:1)
Dynamic Behavior: The dynamic behavior of AGC systems differs substantially between devices. Hearing aids typically implement syllabic compression (attack/release time < 50 ms), whereas cochlear implants use slow-acting automatic gain control (attack/release > 1 sec).
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To see what other professional tools and resources are available to you, join the AB Professional Portal.
