How Hearing Aid Algorithms and Kneepoints Affect What You Hear
02/15/2023
Understanding the Technology Behind Your Hearing Aids (Without the Jargon)
How do algorithms and kneepoints apply to you? Believe it or not, we use them every time someone wears a hearing aid. Every single time.
A new client, Jane, came in and asked how hearing devices identify speech and sound. I tried to answer, but she looked even more confused. Karen gave it a try, and some things seemed a bit clearer to Jane.
I’ll admit it—I struggle with balancing my industry knowledge and the everyday explanations that make sense in plain language. But I try, because I want you to understand how your hearing aids work, not just trust that they do.
To be transparent, I keep up with the latest hearing aid technology using professional tools like Audiology Online. Here’s an excerpt from one of those resources:
A unique aspect of expansion in the ReSound Alera is that the kneepoints are device-dependent. For each type of device, electroacoustic analysis included careful measurements of the instrument noise floor. Expansion kneepoints were then set to be above the level of the instrument noise floor. This is in contrast with most expansion algorithms, which define kneepoints at fixed levels below the WDRC kneepoints regardless of the device noise floor. The problem with using a fixed expansion level for all devices is that for devices with a higher noise floor, such as power BTEs, expansion may have little effect, while devices with a low noise floor may have too much expansion and subsequent gain reduction. Thus, the device-dependent ReSound approach ensures that expansion is effective for each device type.
— Audiology Online
So What Does That Mean in Simple Terms?
This article simply means that hearing aids make sound, not just from the environment, but from their own inner workings. The tiny microphones, amplifiers, and processors that help you hear better all generate a little noise of their own—kind of like how your computer hums when the fan is on.
ReSound, one of the top hearing aid manufacturers, uses smart algorithms to reduce that internal noise, so you can focus on what really matters—speech clarity and real-life sounds. Their approach adapts based on the specific device you’re using. Whether you wear a small behind-the-ear device or a more powerful hearing aid, the system adjusts the kneepoints (that’s the level where sound processing changes) to give you better clarity and comfort.
In other words, ReSound’s tech works smarter—not just harder—for your specific hearing needs.
Why This Matters to You
If you’ve ever heard a weird humming or switching sound in your hearing aid, it’s not your imagination. It’s your device working hard in the background. These adjustments—especially when done with custom kneepoints and noise floor measurements—can make the difference between a good hearing aid and a great one.
And if I ever get too deep in the weeds trying to explain it to you, just stop me. Say, “Can you say that a different way?” That helps me make sure I’m not just throwing technical terms at you, but actually helping you understand your hearing.
Want to Learn More About Your Hearing Aids?
If you’ve got questions about how your hearing aids work—or wonder if newer models with advanced sound processing might be a better fit for your lifestyle—give us a call at (941) 244-9300 or contact us online. Whether you’re a current client or just starting your journey to better hearing, we’re here to help.