Feedback management feature
Reduces unwanted feedback in nearly any situation without compromising gain via phase cancellation with static and dynamic filters. Whistling noises, known as feedback, will not disturb listening experiences or alter the volume.
When feedback is detected, a phase-inverted signal is applied, which cancels out the whistling. It applies two individual control systems that work together to provide maximum comfort with feedback-free hearing.
The system analyzes the calibration signal during fitting and neutralizes feedback with a static control signal. This accounts for the unchanging contributors to feedback such as venting, ear geometry, and hearing aid components.
The dynamic control system includes two parts. One is a dynamic filter that changes to eliminate feedback via phase cancellation when wearing the hearing aids. As part of the dynamic control system, Whistle Control is used only in extreme cases, when DFS Ultra III alone cannot cancel feedback completely. In such cases, it lowers the gain to the prescribed level of frequencies affected by feedback until feedback is eliminated.
End user benefit
User is not bothered by feedback or by sudden reduction of volume, which some other hearing aids do to prevent feedback.
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